使用 JFrame 打印动态选中的复选框
Print dynamic selected checkbox using JFrame
我是 JFrame 的新手，我试图用滚动窗格填充动态复选框。我尝试了一些代码，如下所示。我的重点是：
- 获取选中的动态复选框的名称。
- 当我单击否（单选按钮）时，复选框面板设置为 disabled/frozen/uncheckable。
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JScrollBar;
import javax.swing.JTextField;
import javax.swing.border.BevelBorder;
import javax.swing.border.TitledBorder;
import net.miginfocom.swing.MigLayout;
public class JFrameMain extends JFrame {
private JPanel contentPane;
private JButton btnOkay;
private JTextField textField;
private JRadioButton yes;
private JRadioButton no;
// Launch the application.
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
JFrameMain frame = new JFrameMain();
frame.setVisible(true);
}
catch (Exception e) {
e.printStackTrace();
}
}
});
}
// Create the frame.
public JFrameMain() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 556, 383);
contentPane = new JPanel();
contentPane.setBorder(new BevelBorder(BevelBorder.LOWERED, null, null, null, null));
setContentPane(contentPane);
contentPane.setLayout(null);
JPanel panel = new JPanel();
panel.setBorder(new TitledBorder(null, "Enetr the class", TitledBorder.LEADING, TitledBorder.TOP, null, null));
panel.setBounds(44, 23, 443, 53);
contentPane.add(panel);
panel.setLayout(null);
yes = new JRadioButton("yes");
yes.setSelected(true);
yes.setBounds(144, 20, 64, 25);
panel.add(yes);
yes.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if(yes.isSelected())
{
no.setSelected(false);
textField.setEnabled(true);
}
}
});
no = new JRadioButton("No");
no.setBounds(212, 20, 64, 25);
panel.add(no);
no.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if(no.isSelected())
{
yes.setSelected(false);
textField.setEnabled(false);
}
}
});
btnOkay = new JButton("Okay");
btnOkay.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
//Text field
System.out.println(textField.getText());
}
});
btnOkay.setBounds(120, 281, 97, 25);
contentPane.add(btnOkay);
JPanel panelCheckBox = new JPanel();
panelCheckBox.setBorder(new BevelBorder(BevelBorder.LOWERED, null, null, null, null));
panelCheckBox.setBounds(44, 89, 443, 90);
contentPane.add(panelCheckBox);
panelCheckBox.setLayout(new MigLayout("", "[]", "[]"));
int numberCheckBox = 10;
JCheckBox[] checkBoxList = new JCheckBox[numberCheckBox];
for(int i = 0; i < numberCheckBox; i++) {
checkBoxList[i] = new JCheckBox("CheckBox" + i);
panelCheckBox.add(checkBoxList[i]);
}
JScrollBar scrollBar = new JScrollBar();
scrollBar.setBounds(492, 89, 21, 90);
contentPane.add(scrollBar);
JPanel panel_1 = new JPanel();
panel_1.setBorder(new TitledBorder(null, "Enter Class", TitledBorder.LEADING, TitledBorder.TOP, null, null));
panel_1.setBounds(44, 192, 443, 66);
contentPane.add(panel_1);
panel_1.setLayout(null);
textField = new JTextField();
//textField.setEnabled(false);
textField.setBounds(55, 23, 336, 22);
panel_1.add(textField);
textField.setColumns(10);
JButton btnCancel = new JButton("Cancel");
btnCancel.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.exit(1);
}
});
btnCancel.setBounds(263, 281, 97, 25);
contentPane.add(btnCancel);
}
}
过去 3 天我一直被这个问题困扰着。无法在动态复选框中获取选定的复选框名称。谁能帮我解决这个问题？
先看看 How to Use Buttons, Check Boxes, and Radio Buttons and How to Write an Action Listener
您要关注的一件事是按钮的 setActionCommand 和 ActionEvent
的 getActionCommand
例如...
ActionListener actionListener = new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
System.out.println("You clicked " + e.getActionCommand());
}
};
for (int i = 0; i < numberCheckBox; i++) {
checkBoxList[i] = new JCheckBox("CheckBox" + i);
panelCheckBox.add(checkBoxList[i]);
checkBoxList[i].addActionListener(actionListener);
}
您还需要花时间通读 How to Use Scroll Panes and Laying Out Components Within a Container
现在，因为这让我很烦，以下基本上是您使用适当的布局管理器进行的设计
你的...
和我的相比...
现在您还可以免费获得抵抗力
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.FlowLayout;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
import javax.swing.border.EmptyBorder;
import javax.swing.border.TitledBorder;
public class Test {
public static void main(String[] args) {
new Test();
}
public Test() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
JFrame frame = new JFrame();
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
public TestPane() {
setBorder(new EmptyBorder(16, 16, 16, 16));
setLayout(new GridBagLayout());
JTextField textField = new JTextField(40);
JRadioButton yes = new JRadioButton("yes");
yes.setSelected(true);
yes.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (yes.isSelected()) {
textField.setEnabled(true);
}
}
});
JRadioButton no = new JRadioButton("No");
no.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (no.isSelected()) {
textField.setEnabled(false);
}
}
});
JPanel enterClassPane = new JPanel(new GridBagLayout());
enterClassPane.setBorder(new TitledBorder(null, "Enetr the class", TitledBorder.LEADING, TitledBorder.TOP, null, null));
enterClassPane.add(yes);
enterClassPane.add(no);
JPanel panelCheckBox = new JPanel(new WrapLayout(WrapLayout.LEADING));
int numberCheckBox = 10;
JCheckBox[] checkBoxList = new JCheckBox[numberCheckBox];
for (int i = 0; i < numberCheckBox; i++) {
checkBoxList[i] = new JCheckBox("CheckBox" + i);
panelCheckBox.add(checkBoxList[i]);
checkBoxList[i].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
System.out.println("You clicked " + e.getActionCommand());
}
});
}
JPanel classPane = new JPanel(new GridBagLayout());
classPane.setBorder(new TitledBorder(null, "Enter Class", TitledBorder.LEADING, TitledBorder.TOP, null, null));
classPane.add(textField);
JPanel actionsPane = new JPanel(new GridBagLayout());
JButton btnCancel = new JButton("Cancel");
btnCancel.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.exit(1);
}
});
JButton btnOkay = new JButton("Okay");
btnOkay.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
//Text field
System.out.println(textField.getText());
}
});
actionsPane.add(btnOkay);
actionsPane.add(btnCancel);
GridBagConstraints gbc = new GridBagConstraints();
gbc.insets = new Insets(4, 4, 4, 4);
gbc.gridwidth = gbc.REMAINDER;
gbc.fill = gbc.HORIZONTAL;
add(enterClassPane, gbc);
add(new JScrollPane(panelCheckBox), gbc);
add(classPane, gbc);
add(actionsPane, gbc);
}
}
public class WrapLayout extends FlowLayout {
private Dimension preferredLayoutSize;
/**
* Constructs a new <code>WrapLayout</code> with a left alignment and a
* default 5-unit horizontal and vertical gap.
*/
public WrapLayout() {
super();
}
/**
* Constructs a new <code>FlowLayout</code> with the specified alignment
* and a default 5-unit horizontal and vertical gap. The value of the
* alignment argument must be one of <code>WrapLayout</code>,
* <code>WrapLayout</code>, or <code>WrapLayout</code>.
*
* @param align the alignment value
*/
public WrapLayout(int align) {
super(align);
}
/**
* Creates a new flow layout manager with the indicated alignment and
* the indicated horizontal and vertical gaps.
* <p>
* The value of the alignment argument must be one of
* <code>WrapLayout</code>, <code>WrapLayout</code>, or
* <code>WrapLayout</code>.
*
* @param align the alignment value
* @param hgap the horizontal gap between components
* @param vgap the vertical gap between components
*/
public WrapLayout(int align, int hgap, int vgap) {
super(align, hgap, vgap);
}
/**
* Returns the preferred dimensions for this layout given the
* <i>visible</i> components in the specified target container.
*
* @param target the component which needs to be laid out
* @return the preferred dimensions to lay out the subcomponents of the
* specified container
*/
@Override
public Dimension preferredLayoutSize(Container target) {
return layoutSize(target, true);
}
/**
* Returns the minimum dimensions needed to layout the <i>visible</i>
* components contained in the specified target container.
*
* @param target the component which needs to be laid out
* @return the minimum dimensions to lay out the subcomponents of the
* specified container
*/
@Override
public Dimension minimumLayoutSize(Container target) {
Dimension minimum = layoutSize(target, false);
minimum.width -= (getHgap() + 1);
return minimum;
}
/**
* Returns the minimum or preferred dimension needed to layout the
* target container.
*
* @param target target to get layout size for
* @param preferred should preferred size be calculated
* @return the dimension to layout the target container
*/
private Dimension layoutSize(Container target, boolean preferred) {
synchronized (target.getTreeLock()) {
// Each row must fit with the width allocated to the containter.
// When the container width = 0, the preferred width of the container
// has not yet been calculated so lets ask for the maximum.
int targetWidth = target.getSize().width;
Container container = target;
while (container.getSize().width == 0 && container.getParent() != null) {
container = container.getParent();
}
targetWidth = container.getSize().width;
if (targetWidth == 0) {
targetWidth = Integer.MAX_VALUE;
}
int hgap = getHgap();
int vgap = getVgap();
Insets insets = target.getInsets();
int horizontalInsetsAndGap = insets.left + insets.right + (hgap * 2);
int maxWidth = targetWidth - horizontalInsetsAndGap;
// Fit components into the allowed width
Dimension dim = new Dimension(0, 0);
int rowWidth = 0;
int rowHeight = 0;
int nmembers = target.getComponentCount();
for (int i = 0; i < nmembers; i++) {
Component m = target.getComponent(i);
if (m.isVisible()) {
Dimension d = preferred ? m.getPreferredSize() : m.getMinimumSize();
// Can't add the component to current row. Start a new row.
if (rowWidth + d.width > maxWidth) {
addRow(dim, rowWidth, rowHeight);
rowWidth = 0;
rowHeight = 0;
}
// Add a horizontal gap for all components after the first
if (rowWidth != 0) {
rowWidth += hgap;
}
rowWidth += d.width;
rowHeight = Math.max(rowHeight, d.height);
}
}
addRow(dim, rowWidth, rowHeight);
dim.width += horizontalInsetsAndGap;
dim.height += insets.top + insets.bottom + vgap * 2;
// When using a scroll pane or the DecoratedLookAndFeel we need to
// make sure the preferred size is less than the size of the
// target containter so shrinking the container size works
// correctly. Removing the horizontal gap is an easy way to do this.
Container scrollPane = SwingUtilities.getAncestorOfClass(JScrollPane.class, target);
if (scrollPane != null && target.isValid()) {
dim.width -= (hgap + 1);
}
return dim;
}
}
/*
* A new row has been completed. Use the dimensions of this row
* to update the preferred size for the container.
*
* @param dim update the width and height when appropriate
* @param rowWidth the width of the row to add
* @param rowHeight the height of the row to add
*/
private void addRow(Dimension dim, int rowWidth, int rowHeight) {
dim.width = Math.max(dim.width, rowWidth);
if (dim.height > 0) {
dim.height += getVgap();
}
dim.height += rowHeight;
}
}
}
Actually I want this selected checkbox while I click OKAY Button
您有多种可能的选择。一种可能是简单地从某种 List
添加或删除复选框的“操作命令”
例如...
checkBoxList[i].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
System.out.println("You clicked " + e.getActionCommand());
if (e.getSource() instanceof JCheckBox) {
JCheckBox cb = (JCheckBox) e.getSource();
if (cb.isSelected()) {
selectedValues.add(cb.getActionCommand());
} else {
selectedValues.remove(cb.getActionCommand());
}
}
}
});
可运行示例
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.FlowLayout;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.HashSet;
import java.util.Set;
import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
import javax.swing.border.EmptyBorder;
import javax.swing.border.TitledBorder;
public class Test {
public static void main(String[] args) {
new Test();
}
public Test() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
JFrame frame = new JFrame();
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private Set<String> selectedValues = new HashSet<>(8);
public TestPane() {
setBorder(new EmptyBorder(16, 16, 16, 16));
setLayout(new GridBagLayout());
JTextField textField = new JTextField(40);
JRadioButton yes = new JRadioButton("yes");
yes.setSelected(true);
yes.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (yes.isSelected()) {
textField.setEnabled(true);
}
}
});
JRadioButton no = new JRadioButton("No");
no.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (no.isSelected()) {
textField.setEnabled(false);
}
}
});
ButtonGroup bg = new ButtonGroup();
bg.add(yes);
bg.add(no);
JPanel enterClassPane = new JPanel(new GridBagLayout());
enterClassPane.setBorder(new TitledBorder(null, "Enetr the class", TitledBorder.LEADING, TitledBorder.TOP, null, null));
enterClassPane.add(yes);
enterClassPane.add(no);
JPanel panelCheckBox = new JPanel(new WrapLayout(WrapLayout.LEADING));
int numberCheckBox = 10;
JCheckBox[] checkBoxList = new JCheckBox[numberCheckBox];
for (int i = 0; i < numberCheckBox; i++) {
checkBoxList[i] = new JCheckBox("CheckBox" + i);
panelCheckBox.add(checkBoxList[i]);
checkBoxList[i].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
System.out.println("You clicked " + e.getActionCommand());
if (e.getSource() instanceof JCheckBox) {
JCheckBox cb = (JCheckBox) e.getSource();
if (cb.isSelected()) {
selectedValues.add(cb.getActionCommand());
} else {
selectedValues.remove(cb.getActionCommand());
}
}
}
});
}
JPanel classPane = new JPanel(new GridBagLayout());
classPane.setBorder(new TitledBorder(null, "Enter Class", TitledBorder.LEADING, TitledBorder.TOP, null, null));
classPane.add(textField);
JPanel actionsPane = new JPanel(new GridBagLayout());
JButton btnCancel = new JButton("Cancel");
btnCancel.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.exit(1);
}
});
JButton btnOkay = new JButton("Okay");
btnOkay.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
//Text field
System.out.println(textField.getText());
for (String command : selectedValues) {
System.out.println(command);
}
}
});
actionsPane.add(btnOkay);
actionsPane.add(btnCancel);
GridBagConstraints gbc = new GridBagConstraints();
gbc.insets = new Insets(4, 4, 4, 4);
gbc.gridwidth = gbc.REMAINDER;
gbc.fill = gbc.HORIZONTAL;
add(enterClassPane, gbc);
add(new JScrollPane(panelCheckBox), gbc);
add(classPane, gbc);
add(actionsPane, gbc);
}
}
public class WrapLayout extends FlowLayout {
private Dimension preferredLayoutSize;
/**
* Constructs a new <code>WrapLayout</code> with a left alignment and a
* default 5-unit horizontal and vertical gap.
*/
public WrapLayout() {
super();
}
/**
* Constructs a new <code>FlowLayout</code> with the specified alignment
* and a default 5-unit horizontal and vertical gap. The value of the
* alignment argument must be one of <code>WrapLayout</code>,
* <code>WrapLayout</code>, or <code>WrapLayout</code>.
*
* @param align the alignment value
*/
public WrapLayout(int align) {
super(align);
}
/**
* Creates a new flow layout manager with the indicated alignment and
* the indicated horizontal and vertical gaps.
* <p>
* The value of the alignment argument must be one of
* <code>WrapLayout</code>, <code>WrapLayout</code>, or
* <code>WrapLayout</code>.
*
* @param align the alignment value
* @param hgap the horizontal gap between components
* @param vgap the vertical gap between components
*/
public WrapLayout(int align, int hgap, int vgap) {
super(align, hgap, vgap);
}
/**
* Returns the preferred dimensions for this layout given the
* <i>visible</i> components in the specified target container.
*
* @param target the component which needs to be laid out
* @return the preferred dimensions to lay out the subcomponents of the
* specified container
*/
@Override
public Dimension preferredLayoutSize(Container target) {
return layoutSize(target, true);
}
/**
* Returns the minimum dimensions needed to layout the <i>visible</i>
* components contained in the specified target container.
*
* @param target the component which needs to be laid out
* @return the minimum dimensions to lay out the subcomponents of the
* specified container
*/
@Override
public Dimension minimumLayoutSize(Container target) {
Dimension minimum = layoutSize(target, false);
minimum.width -= (getHgap() + 1);
return minimum;
}
/**
* Returns the minimum or preferred dimension needed to layout the
* target container.
*
* @param target target to get layout size for
* @param preferred should preferred size be calculated
* @return the dimension to layout the target container
*/
private Dimension layoutSize(Container target, boolean preferred) {
synchronized (target.getTreeLock()) {
// Each row must fit with the width allocated to the containter.
// When the container width = 0, the preferred width of the container
// has not yet been calculated so lets ask for the maximum.
int targetWidth = target.getSize().width;
Container container = target;
while (container.getSize().width == 0 && container.getParent() != null) {
container = container.getParent();
}
targetWidth = container.getSize().width;
if (targetWidth == 0) {
targetWidth = Integer.MAX_VALUE;
}
int hgap = getHgap();
int vgap = getVgap();
Insets insets = target.getInsets();
int horizontalInsetsAndGap = insets.left + insets.right + (hgap * 2);
int maxWidth = targetWidth - horizontalInsetsAndGap;
// Fit components into the allowed width
Dimension dim = new Dimension(0, 0);
int rowWidth = 0;
int rowHeight = 0;
int nmembers = target.getComponentCount();
for (int i = 0; i < nmembers; i++) {
Component m = target.getComponent(i);
if (m.isVisible()) {
Dimension d = preferred ? m.getPreferredSize() : m.getMinimumSize();
// Can't add the component to current row. Start a new row.
if (rowWidth + d.width > maxWidth) {
addRow(dim, rowWidth, rowHeight);
rowWidth = 0;
rowHeight = 0;
}
// Add a horizontal gap for all components after the first
if (rowWidth != 0) {
rowWidth += hgap;
}
rowWidth += d.width;
rowHeight = Math.max(rowHeight, d.height);
}
}
addRow(dim, rowWidth, rowHeight);
dim.width += horizontalInsetsAndGap;
dim.height += insets.top + insets.bottom + vgap * 2;
// When using a scroll pane or the DecoratedLookAndFeel we need to
// make sure the preferred size is less than the size of the
// target containter so shrinking the container size works
// correctly. Removing the horizontal gap is an easy way to do this.
Container scrollPane = SwingUtilities.getAncestorOfClass(JScrollPane.class, target);
if (scrollPane != null && target.isValid()) {
dim.width -= (hgap + 1);
}
return dim;
}
}
/*
* A new row has been completed. Use the dimensions of this row
* to update the preferred size for the container.
*
* @param dim update the width and height when appropriate
* @param rowWidth the width of the row to add
* @param rowHeight the height of the row to add
*/
private void addRow(Dimension dim, int rowWidth, int rowHeight) {
dim.width = Math.max(dim.width, rowWidth);
if (dim.height > 0) {
dim.height += getVgap();
}
dim.height += rowHeight;
}
}
}
我建议不要使用空布局和手动设置边界，而是使用基本布局管理器的组合来完成这项工作。
注意 JRadioButton 的注释和 ButtonGroup 的使用：
import java.awt.*;
import javax.swing.*;
import javax.swing.border.*;
public class JFrameMain extends JFrame {
private final JPanel contentPane;
private final JButton btnOkay;
private JTextField textField = null;
private final JRadioButton yes;
private final JRadioButton no;
public static void main(String[] args) {
EventQueue.invokeLater(() -> {
try {
JFrameMain frame = new JFrameMain();
frame.setVisible(true);
}
catch (Exception e) {
e.printStackTrace();
}
});
}
public JFrameMain() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
contentPane = new JPanel();
contentPane.setBorder(new BevelBorder(BevelBorder.LOWERED, null, null, null, null));
contentPane.setLayout(new BoxLayout(contentPane, BoxLayout.PAGE_AXIS));
setContentPane(contentPane);
JPanel panel = new JPanel(); //use the default FlowLayoyt
panel.setBorder(new TitledBorder(null, "Enetr the class", TitledBorder.LEADING, TitledBorder.TOP, null, null));
contentPane.add(panel);
yes = new JRadioButton("yes");
yes.setSelected(true);
panel.add(yes);
yes.addActionListener(e -> {
if(yes.isSelected()) {
textField.setEnabled(true);
}
});
no = new JRadioButton("No");
panel.add(no);
no.addActionListener(e -> {
if(no.isSelected()) {
textField.setEnabled(false);
}
});
//for the required functionality add the radio buttons to ButtonGroup
ButtonGroup bg = new ButtonGroup();
bg.add(yes); bg.add(no);
JPanel panelCheckBox = new JPanel();
panelCheckBox.setBorder(new BevelBorder(BevelBorder.LOWERED, null, null, null, null));
contentPane.add(panelCheckBox); //or contentPane.add(new JScrollPane(panelCheckBox));
contentPane.add(panelCheckBox);
panelCheckBox.setLayout(new GridLayout(0, 4, 5, 5)); //GridLayout is a better choice for mre than MigLayout
int numberCheckBox = 10;
JCheckBox[] checkBoxList = new JCheckBox[numberCheckBox];
for(int i = 0; i < numberCheckBox; i++) {
JCheckBox cb = new JCheckBox("CheckBox" + i);
panelCheckBox.add(cb);
cb.addActionListener(e->System.out.println(cb.getText() +" selected"));
checkBoxList[i] = cb;
}
JPanel panel_1 = new JPanel();//use the default FlowLayoyt
panel_1.setBorder(new TitledBorder(null, "Enter Class", TitledBorder.LEADING, TitledBorder.TOP, null, null));
contentPane.add(panel_1);
textField = new JTextField();
textField.setColumns(40);
panel_1.add(textField);
JPanel buttonspane = new JPanel(); //use a panel with the default FlowLayoyt for the buttons
contentPane.add(buttonspane);
btnOkay = new JButton("Okay");
btnOkay.addActionListener(e -> System.out.println(textField.getText()));
buttonspane.add(btnOkay);
JButton btnCancel = new JButton("Cancel");
btnCancel.addActionListener(e -> System.exit(1));
buttonspane.add(btnCancel);
pack();
}
}
我是 JFrame 的新手，我试图用滚动窗格填充动态复选框。我尝试了一些代码，如下所示。我的重点是：
- 获取选中的动态复选框的名称。
- 当我单击否（单选按钮）时，复选框面板设置为 disabled/frozen/uncheckable。
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JScrollBar;
import javax.swing.JTextField;
import javax.swing.border.BevelBorder;
import javax.swing.border.TitledBorder;
import net.miginfocom.swing.MigLayout;
public class JFrameMain extends JFrame {
private JPanel contentPane;
private JButton btnOkay;
private JTextField textField;
private JRadioButton yes;
private JRadioButton no;
// Launch the application.
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
JFrameMain frame = new JFrameMain();
frame.setVisible(true);
}
catch (Exception e) {
e.printStackTrace();
}
}
});
}
// Create the frame.
public JFrameMain() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 556, 383);
contentPane = new JPanel();
contentPane.setBorder(new BevelBorder(BevelBorder.LOWERED, null, null, null, null));
setContentPane(contentPane);
contentPane.setLayout(null);
JPanel panel = new JPanel();
panel.setBorder(new TitledBorder(null, "Enetr the class", TitledBorder.LEADING, TitledBorder.TOP, null, null));
panel.setBounds(44, 23, 443, 53);
contentPane.add(panel);
panel.setLayout(null);
yes = new JRadioButton("yes");
yes.setSelected(true);
yes.setBounds(144, 20, 64, 25);
panel.add(yes);
yes.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if(yes.isSelected())
{
no.setSelected(false);
textField.setEnabled(true);
}
}
});
no = new JRadioButton("No");
no.setBounds(212, 20, 64, 25);
panel.add(no);
no.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if(no.isSelected())
{
yes.setSelected(false);
textField.setEnabled(false);
}
}
});
btnOkay = new JButton("Okay");
btnOkay.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
//Text field
System.out.println(textField.getText());
}
});
btnOkay.setBounds(120, 281, 97, 25);
contentPane.add(btnOkay);
JPanel panelCheckBox = new JPanel();
panelCheckBox.setBorder(new BevelBorder(BevelBorder.LOWERED, null, null, null, null));
panelCheckBox.setBounds(44, 89, 443, 90);
contentPane.add(panelCheckBox);
panelCheckBox.setLayout(new MigLayout("", "[]", "[]"));
int numberCheckBox = 10;
JCheckBox[] checkBoxList = new JCheckBox[numberCheckBox];
for(int i = 0; i < numberCheckBox; i++) {
checkBoxList[i] = new JCheckBox("CheckBox" + i);
panelCheckBox.add(checkBoxList[i]);
}
JScrollBar scrollBar = new JScrollBar();
scrollBar.setBounds(492, 89, 21, 90);
contentPane.add(scrollBar);
JPanel panel_1 = new JPanel();
panel_1.setBorder(new TitledBorder(null, "Enter Class", TitledBorder.LEADING, TitledBorder.TOP, null, null));
panel_1.setBounds(44, 192, 443, 66);
contentPane.add(panel_1);
panel_1.setLayout(null);
textField = new JTextField();
//textField.setEnabled(false);
textField.setBounds(55, 23, 336, 22);
panel_1.add(textField);
textField.setColumns(10);
JButton btnCancel = new JButton("Cancel");
btnCancel.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.exit(1);
}
});
btnCancel.setBounds(263, 281, 97, 25);
contentPane.add(btnCancel);
}
}
过去 3 天我一直被这个问题困扰着。无法在动态复选框中获取选定的复选框名称。谁能帮我解决这个问题？
先看看 How to Use Buttons, Check Boxes, and Radio Buttons and How to Write an Action Listener
您要关注的一件事是按钮的 setActionCommand 和 ActionEvent
getActionCommand
例如...
ActionListener actionListener = new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
System.out.println("You clicked " + e.getActionCommand());
}
};
for (int i = 0; i < numberCheckBox; i++) {
checkBoxList[i] = new JCheckBox("CheckBox" + i);
panelCheckBox.add(checkBoxList[i]);
checkBoxList[i].addActionListener(actionListener);
}
您还需要花时间通读 How to Use Scroll Panes and Laying Out Components Within a Container
现在，因为这让我很烦，以下基本上是您使用适当的布局管理器进行的设计
你的...
和我的相比...
现在您还可以免费获得抵抗力
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.FlowLayout;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
import javax.swing.border.EmptyBorder;
import javax.swing.border.TitledBorder;
public class Test {
public static void main(String[] args) {
new Test();
}
public Test() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
JFrame frame = new JFrame();
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
public TestPane() {
setBorder(new EmptyBorder(16, 16, 16, 16));
setLayout(new GridBagLayout());
JTextField textField = new JTextField(40);
JRadioButton yes = new JRadioButton("yes");
yes.setSelected(true);
yes.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (yes.isSelected()) {
textField.setEnabled(true);
}
}
});
JRadioButton no = new JRadioButton("No");
no.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (no.isSelected()) {
textField.setEnabled(false);
}
}
});
JPanel enterClassPane = new JPanel(new GridBagLayout());
enterClassPane.setBorder(new TitledBorder(null, "Enetr the class", TitledBorder.LEADING, TitledBorder.TOP, null, null));
enterClassPane.add(yes);
enterClassPane.add(no);
JPanel panelCheckBox = new JPanel(new WrapLayout(WrapLayout.LEADING));
int numberCheckBox = 10;
JCheckBox[] checkBoxList = new JCheckBox[numberCheckBox];
for (int i = 0; i < numberCheckBox; i++) {
checkBoxList[i] = new JCheckBox("CheckBox" + i);
panelCheckBox.add(checkBoxList[i]);
checkBoxList[i].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
System.out.println("You clicked " + e.getActionCommand());
}
});
}
JPanel classPane = new JPanel(new GridBagLayout());
classPane.setBorder(new TitledBorder(null, "Enter Class", TitledBorder.LEADING, TitledBorder.TOP, null, null));
classPane.add(textField);
JPanel actionsPane = new JPanel(new GridBagLayout());
JButton btnCancel = new JButton("Cancel");
btnCancel.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.exit(1);
}
});
JButton btnOkay = new JButton("Okay");
btnOkay.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
//Text field
System.out.println(textField.getText());
}
});
actionsPane.add(btnOkay);
actionsPane.add(btnCancel);
GridBagConstraints gbc = new GridBagConstraints();
gbc.insets = new Insets(4, 4, 4, 4);
gbc.gridwidth = gbc.REMAINDER;
gbc.fill = gbc.HORIZONTAL;
add(enterClassPane, gbc);
add(new JScrollPane(panelCheckBox), gbc);
add(classPane, gbc);
add(actionsPane, gbc);
}
}
public class WrapLayout extends FlowLayout {
private Dimension preferredLayoutSize;
/**
* Constructs a new <code>WrapLayout</code> with a left alignment and a
* default 5-unit horizontal and vertical gap.
*/
public WrapLayout() {
super();
}
/**
* Constructs a new <code>FlowLayout</code> with the specified alignment
* and a default 5-unit horizontal and vertical gap. The value of the
* alignment argument must be one of <code>WrapLayout</code>,
* <code>WrapLayout</code>, or <code>WrapLayout</code>.
*
* @param align the alignment value
*/
public WrapLayout(int align) {
super(align);
}
/**
* Creates a new flow layout manager with the indicated alignment and
* the indicated horizontal and vertical gaps.
* <p>
* The value of the alignment argument must be one of
* <code>WrapLayout</code>, <code>WrapLayout</code>, or
* <code>WrapLayout</code>.
*
* @param align the alignment value
* @param hgap the horizontal gap between components
* @param vgap the vertical gap between components
*/
public WrapLayout(int align, int hgap, int vgap) {
super(align, hgap, vgap);
}
/**
* Returns the preferred dimensions for this layout given the
* <i>visible</i> components in the specified target container.
*
* @param target the component which needs to be laid out
* @return the preferred dimensions to lay out the subcomponents of the
* specified container
*/
@Override
public Dimension preferredLayoutSize(Container target) {
return layoutSize(target, true);
}
/**
* Returns the minimum dimensions needed to layout the <i>visible</i>
* components contained in the specified target container.
*
* @param target the component which needs to be laid out
* @return the minimum dimensions to lay out the subcomponents of the
* specified container
*/
@Override
public Dimension minimumLayoutSize(Container target) {
Dimension minimum = layoutSize(target, false);
minimum.width -= (getHgap() + 1);
return minimum;
}
/**
* Returns the minimum or preferred dimension needed to layout the
* target container.
*
* @param target target to get layout size for
* @param preferred should preferred size be calculated
* @return the dimension to layout the target container
*/
private Dimension layoutSize(Container target, boolean preferred) {
synchronized (target.getTreeLock()) {
// Each row must fit with the width allocated to the containter.
// When the container width = 0, the preferred width of the container
// has not yet been calculated so lets ask for the maximum.
int targetWidth = target.getSize().width;
Container container = target;
while (container.getSize().width == 0 && container.getParent() != null) {
container = container.getParent();
}
targetWidth = container.getSize().width;
if (targetWidth == 0) {
targetWidth = Integer.MAX_VALUE;
}
int hgap = getHgap();
int vgap = getVgap();
Insets insets = target.getInsets();
int horizontalInsetsAndGap = insets.left + insets.right + (hgap * 2);
int maxWidth = targetWidth - horizontalInsetsAndGap;
// Fit components into the allowed width
Dimension dim = new Dimension(0, 0);
int rowWidth = 0;
int rowHeight = 0;
int nmembers = target.getComponentCount();
for (int i = 0; i < nmembers; i++) {
Component m = target.getComponent(i);
if (m.isVisible()) {
Dimension d = preferred ? m.getPreferredSize() : m.getMinimumSize();
// Can't add the component to current row. Start a new row.
if (rowWidth + d.width > maxWidth) {
addRow(dim, rowWidth, rowHeight);
rowWidth = 0;
rowHeight = 0;
}
// Add a horizontal gap for all components after the first
if (rowWidth != 0) {
rowWidth += hgap;
}
rowWidth += d.width;
rowHeight = Math.max(rowHeight, d.height);
}
}
addRow(dim, rowWidth, rowHeight);
dim.width += horizontalInsetsAndGap;
dim.height += insets.top + insets.bottom + vgap * 2;
// When using a scroll pane or the DecoratedLookAndFeel we need to
// make sure the preferred size is less than the size of the
// target containter so shrinking the container size works
// correctly. Removing the horizontal gap is an easy way to do this.
Container scrollPane = SwingUtilities.getAncestorOfClass(JScrollPane.class, target);
if (scrollPane != null && target.isValid()) {
dim.width -= (hgap + 1);
}
return dim;
}
}
/*
* A new row has been completed. Use the dimensions of this row
* to update the preferred size for the container.
*
* @param dim update the width and height when appropriate
* @param rowWidth the width of the row to add
* @param rowHeight the height of the row to add
*/
private void addRow(Dimension dim, int rowWidth, int rowHeight) {
dim.width = Math.max(dim.width, rowWidth);
if (dim.height > 0) {
dim.height += getVgap();
}
dim.height += rowHeight;
}
}
}
Actually I want this selected checkbox while I click OKAY Button
您有多种可能的选择。一种可能是简单地从某种 List
例如...
checkBoxList[i].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
System.out.println("You clicked " + e.getActionCommand());
if (e.getSource() instanceof JCheckBox) {
JCheckBox cb = (JCheckBox) e.getSource();
if (cb.isSelected()) {
selectedValues.add(cb.getActionCommand());
} else {
selectedValues.remove(cb.getActionCommand());
}
}
}
});
可运行示例
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.FlowLayout;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.HashSet;
import java.util.Set;
import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
import javax.swing.border.EmptyBorder;
import javax.swing.border.TitledBorder;
public class Test {
public static void main(String[] args) {
new Test();
}
public Test() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
JFrame frame = new JFrame();
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private Set<String> selectedValues = new HashSet<>(8);
public TestPane() {
setBorder(new EmptyBorder(16, 16, 16, 16));
setLayout(new GridBagLayout());
JTextField textField = new JTextField(40);
JRadioButton yes = new JRadioButton("yes");
yes.setSelected(true);
yes.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (yes.isSelected()) {
textField.setEnabled(true);
}
}
});
JRadioButton no = new JRadioButton("No");
no.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (no.isSelected()) {
textField.setEnabled(false);
}
}
});
ButtonGroup bg = new ButtonGroup();
bg.add(yes);
bg.add(no);
JPanel enterClassPane = new JPanel(new GridBagLayout());
enterClassPane.setBorder(new TitledBorder(null, "Enetr the class", TitledBorder.LEADING, TitledBorder.TOP, null, null));
enterClassPane.add(yes);
enterClassPane.add(no);
JPanel panelCheckBox = new JPanel(new WrapLayout(WrapLayout.LEADING));
int numberCheckBox = 10;
JCheckBox[] checkBoxList = new JCheckBox[numberCheckBox];
for (int i = 0; i < numberCheckBox; i++) {
checkBoxList[i] = new JCheckBox("CheckBox" + i);
panelCheckBox.add(checkBoxList[i]);
checkBoxList[i].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
System.out.println("You clicked " + e.getActionCommand());
if (e.getSource() instanceof JCheckBox) {
JCheckBox cb = (JCheckBox) e.getSource();
if (cb.isSelected()) {
selectedValues.add(cb.getActionCommand());
} else {
selectedValues.remove(cb.getActionCommand());
}
}
}
});
}
JPanel classPane = new JPanel(new GridBagLayout());
classPane.setBorder(new TitledBorder(null, "Enter Class", TitledBorder.LEADING, TitledBorder.TOP, null, null));
classPane.add(textField);
JPanel actionsPane = new JPanel(new GridBagLayout());
JButton btnCancel = new JButton("Cancel");
btnCancel.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.exit(1);
}
});
JButton btnOkay = new JButton("Okay");
btnOkay.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
//Text field
System.out.println(textField.getText());
for (String command : selectedValues) {
System.out.println(command);
}
}
});
actionsPane.add(btnOkay);
actionsPane.add(btnCancel);
GridBagConstraints gbc = new GridBagConstraints();
gbc.insets = new Insets(4, 4, 4, 4);
gbc.gridwidth = gbc.REMAINDER;
gbc.fill = gbc.HORIZONTAL;
add(enterClassPane, gbc);
add(new JScrollPane(panelCheckBox), gbc);
add(classPane, gbc);
add(actionsPane, gbc);
}
}
public class WrapLayout extends FlowLayout {
private Dimension preferredLayoutSize;
/**
* Constructs a new <code>WrapLayout</code> with a left alignment and a
* default 5-unit horizontal and vertical gap.
*/
public WrapLayout() {
super();
}
/**
* Constructs a new <code>FlowLayout</code> with the specified alignment
* and a default 5-unit horizontal and vertical gap. The value of the
* alignment argument must be one of <code>WrapLayout</code>,
* <code>WrapLayout</code>, or <code>WrapLayout</code>.
*
* @param align the alignment value
*/
public WrapLayout(int align) {
super(align);
}
/**
* Creates a new flow layout manager with the indicated alignment and
* the indicated horizontal and vertical gaps.
* <p>
* The value of the alignment argument must be one of
* <code>WrapLayout</code>, <code>WrapLayout</code>, or
* <code>WrapLayout</code>.
*
* @param align the alignment value
* @param hgap the horizontal gap between components
* @param vgap the vertical gap between components
*/
public WrapLayout(int align, int hgap, int vgap) {
super(align, hgap, vgap);
}
/**
* Returns the preferred dimensions for this layout given the
* <i>visible</i> components in the specified target container.
*
* @param target the component which needs to be laid out
* @return the preferred dimensions to lay out the subcomponents of the
* specified container
*/
@Override
public Dimension preferredLayoutSize(Container target) {
return layoutSize(target, true);
}
/**
* Returns the minimum dimensions needed to layout the <i>visible</i>
* components contained in the specified target container.
*
* @param target the component which needs to be laid out
* @return the minimum dimensions to lay out the subcomponents of the
* specified container
*/
@Override
public Dimension minimumLayoutSize(Container target) {
Dimension minimum = layoutSize(target, false);
minimum.width -= (getHgap() + 1);
return minimum;
}
/**
* Returns the minimum or preferred dimension needed to layout the
* target container.
*
* @param target target to get layout size for
* @param preferred should preferred size be calculated
* @return the dimension to layout the target container
*/
private Dimension layoutSize(Container target, boolean preferred) {
synchronized (target.getTreeLock()) {
// Each row must fit with the width allocated to the containter.
// When the container width = 0, the preferred width of the container
// has not yet been calculated so lets ask for the maximum.
int targetWidth = target.getSize().width;
Container container = target;
while (container.getSize().width == 0 && container.getParent() != null) {
container = container.getParent();
}
targetWidth = container.getSize().width;
if (targetWidth == 0) {
targetWidth = Integer.MAX_VALUE;
}
int hgap = getHgap();
int vgap = getVgap();
Insets insets = target.getInsets();
int horizontalInsetsAndGap = insets.left + insets.right + (hgap * 2);
int maxWidth = targetWidth - horizontalInsetsAndGap;
// Fit components into the allowed width
Dimension dim = new Dimension(0, 0);
int rowWidth = 0;
int rowHeight = 0;
int nmembers = target.getComponentCount();
for (int i = 0; i < nmembers; i++) {
Component m = target.getComponent(i);
if (m.isVisible()) {
Dimension d = preferred ? m.getPreferredSize() : m.getMinimumSize();
// Can't add the component to current row. Start a new row.
if (rowWidth + d.width > maxWidth) {
addRow(dim, rowWidth, rowHeight);
rowWidth = 0;
rowHeight = 0;
}
// Add a horizontal gap for all components after the first
if (rowWidth != 0) {
rowWidth += hgap;
}
rowWidth += d.width;
rowHeight = Math.max(rowHeight, d.height);
}
}
addRow(dim, rowWidth, rowHeight);
dim.width += horizontalInsetsAndGap;
dim.height += insets.top + insets.bottom + vgap * 2;
// When using a scroll pane or the DecoratedLookAndFeel we need to
// make sure the preferred size is less than the size of the
// target containter so shrinking the container size works
// correctly. Removing the horizontal gap is an easy way to do this.
Container scrollPane = SwingUtilities.getAncestorOfClass(JScrollPane.class, target);
if (scrollPane != null && target.isValid()) {
dim.width -= (hgap + 1);
}
return dim;
}
}
/*
* A new row has been completed. Use the dimensions of this row
* to update the preferred size for the container.
*
* @param dim update the width and height when appropriate
* @param rowWidth the width of the row to add
* @param rowHeight the height of the row to add
*/
private void addRow(Dimension dim, int rowWidth, int rowHeight) {
dim.width = Math.max(dim.width, rowWidth);
if (dim.height > 0) {
dim.height += getVgap();
}
dim.height += rowHeight;
}
}
}
我建议不要使用空布局和手动设置边界，而是使用基本布局管理器的组合来完成这项工作。
注意 JRadioButton 的注释和 ButtonGroup 的使用：
import java.awt.*;
import javax.swing.*;
import javax.swing.border.*;
public class JFrameMain extends JFrame {
private final JPanel contentPane;
private final JButton btnOkay;
private JTextField textField = null;
private final JRadioButton yes;
private final JRadioButton no;
public static void main(String[] args) {
EventQueue.invokeLater(() -> {
try {
JFrameMain frame = new JFrameMain();
frame.setVisible(true);
}
catch (Exception e) {
e.printStackTrace();
}
});
}
public JFrameMain() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
contentPane = new JPanel();
contentPane.setBorder(new BevelBorder(BevelBorder.LOWERED, null, null, null, null));
contentPane.setLayout(new BoxLayout(contentPane, BoxLayout.PAGE_AXIS));
setContentPane(contentPane);
JPanel panel = new JPanel(); //use the default FlowLayoyt
panel.setBorder(new TitledBorder(null, "Enetr the class", TitledBorder.LEADING, TitledBorder.TOP, null, null));
contentPane.add(panel);
yes = new JRadioButton("yes");
yes.setSelected(true);
panel.add(yes);
yes.addActionListener(e -> {
if(yes.isSelected()) {
textField.setEnabled(true);
}
});
no = new JRadioButton("No");
panel.add(no);
no.addActionListener(e -> {
if(no.isSelected()) {
textField.setEnabled(false);
}
});
//for the required functionality add the radio buttons to ButtonGroup
ButtonGroup bg = new ButtonGroup();
bg.add(yes); bg.add(no);
JPanel panelCheckBox = new JPanel();
panelCheckBox.setBorder(new BevelBorder(BevelBorder.LOWERED, null, null, null, null));
contentPane.add(panelCheckBox); //or contentPane.add(new JScrollPane(panelCheckBox));
contentPane.add(panelCheckBox);
panelCheckBox.setLayout(new GridLayout(0, 4, 5, 5)); //GridLayout is a better choice for mre than MigLayout
int numberCheckBox = 10;
JCheckBox[] checkBoxList = new JCheckBox[numberCheckBox];
for(int i = 0; i < numberCheckBox; i++) {
JCheckBox cb = new JCheckBox("CheckBox" + i);
panelCheckBox.add(cb);
cb.addActionListener(e->System.out.println(cb.getText() +" selected"));
checkBoxList[i] = cb;
}
JPanel panel_1 = new JPanel();//use the default FlowLayoyt
panel_1.setBorder(new TitledBorder(null, "Enter Class", TitledBorder.LEADING, TitledBorder.TOP, null, null));
contentPane.add(panel_1);
textField = new JTextField();
textField.setColumns(40);
panel_1.add(textField);
JPanel buttonspane = new JPanel(); //use a panel with the default FlowLayoyt for the buttons
contentPane.add(buttonspane);
btnOkay = new JButton("Okay");
btnOkay.addActionListener(e -> System.out.println(textField.getText()));
buttonspane.add(btnOkay);
JButton btnCancel = new JButton("Cancel");
btnCancel.addActionListener(e -> System.exit(1));
buttonspane.add(btnCancel);
pack();
}
}