GridBagLayout 格式错误。 JTextFields 在错误的位置

Question

我根本无法让我的 JTextFields 正确对齐。现在程序看起来像这样：。

现在作业编号已正确对齐。但是，Mark JTextfield 从 7 开始，而 Weight JTextField 从最后一个 Mark 开始。

现在我想要的是所有内容都正确对齐。意思是在 Assignment 1 的同一行下有 Mark 和 Weight JTextFields。这应该一直下降到 7（或者我选择的行数）。

代码：

    public class test{

    private static final Insets normalInsets = new Insets(10,10,0,10);
    private static final Insets finalInsets = new Insets(10,10,10,10);





    private static JPanel createMainPanel(){
        GridBagConstraints gbc = new GridBagConstraints();

        //Adding the JPanels. Panel for instructions
        JPanel panel = new JPanel();
        panel.setLayout(new GridBagLayout());

        int gridy = 0;

        //JLabel for the Instructions
        JTextArea instructionTextArea = new JTextArea(5, 30);
        instructionTextArea.setEditable(false);
        instructionTextArea.setLineWrap(true);
        instructionTextArea.setWrapStyleWord(true);

        JScrollPane instructionScrollPane = new JScrollPane(instructionTextArea);
        addComponent(panel, instructionScrollPane, 0, gridy++, 3, 1, finalInsets, GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL);

        //JLabels for Assignment
        JLabel label1 = new JLabel("Assignment");
        label1.setHorizontalAlignment(JLabel.CENTER);
        addComponent(panel, label1, 0, gridy, 1, 1, finalInsets,GridBagConstraints.CENTER,GridBagConstraints.HORIZONTAL);

        //JLabel for Mark
        JLabel label2 = new JLabel("Mark");
        label2.setHorizontalAlignment(JLabel.CENTER);
        addComponent(panel, label2, 1, gridy, 1, 1, finalInsets, GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL);

        //JLabel for Weight.
        JLabel label3 = new JLabel("Weight");
        label3.setHorizontalAlignment(JLabel.CENTER);
        addComponent(panel, label3, 2, gridy++, 1, 1, finalInsets, GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL);



        //JLabel Number for the number list of assignments at the side.
        for(int i = 1; i<=7; i++){
            String kok = String.valueOf(i);
        JLabel number = new JLabel(kok);
        number.setHorizontalAlignment(JLabel.CENTER);
        addComponent(panel, number, 0, gridy++, 1, 1, normalInsets, GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL);
        }

        //JTextfield for Mark
        for(int i=0; i<7; i++){
        JTextField mark = new JTextField(20);
        mark.setHorizontalAlignment(JLabel.CENTER);
        addComponent(panel, mark, 1, gridy++, 1, 1, normalInsets, GridBagConstraints.CENTER,GridBagConstraints.NONE);
        }

        //JTextfield for Weight
        for(int i=0; i<7; i++){
        JTextField weight = new JTextField(20);
        weight.setHorizontalAlignment(JLabel.CENTER);
        addComponent(panel, weight, 2, gridy++, 1, 1, normalInsets, GridBagConstraints.CENTER,GridBagConstraints.NONE);
        }

        return panel;

    }

    private static void addComponent(Container container, Component component, int gridx, int gridy, int gridwidth, int gridheight, Insets insets, int anchor, int fill ){
        GridBagConstraints gbc = new GridBagConstraints(gridx, gridy, gridwidth, gridheight, 1.0D,1.0D,anchor,fill,insets,0,0);
        container.add(component,gbc);
    }

    public static void main(String[] args) {    
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(createMainPanel());
        frame.pack();
        frame.setVisible(true);
        new test();
    }
}

我是一个糟糕的新 Java 程序员所以请放轻松 :)。

更新~~~~~

 After running the `for` loops which add the `JLabels` and `JTextFields`, you will need to reset `gbc.gridy = 1`. This way the loop will start adding components from the top row.

//JLabel Number for the number list of assignments at the side.
for(int i = 1; i<=7; i++){
    String kok = String.valueOf(i);
    JLabel number = new JLabel(kok);
    number.setHorizontalAlignment(JLabel.CENTER);
    addComponent(panel, number, 0, gridy++, 1, 1, normalInsets, GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL);
}
gbc.gridy = 1;

//JTextfield for Mark
for(int i=0; i<7; i++){
    JTextField mark = new JTextField(20);
    mark.setHorizontalAlignment(JLabel.CENTER);
    gridy = 1; //The code only partly works when I include this
    addComponent(panel, mark, 1, gridy++, 1, 1, normalInsets, GridBagConstraints.CENTER,GridBagConstraints.NONE);
}
gbc.gridy = 1;

这就是它的样子：

只有权重 JTextField 正确对齐。当我不添加 'gridy=1' 时，它与我的原始屏幕截图具有相同的格式错误。

Answer 1

在运行添加 JLabels 和 JTextFields 的 for 循环之后，您将需要重置 gbc.gridy = 2。这样，循环将从顶行开始添加组件。此外，在每次使用 addComponent() 时，将 gridy++ 更改为 gbc.gridy++。

gbc.gridy = 2;

//JLabel Number for the number list of assignments at the side.
for(int i = 1; i<=7; i++){
    String kok = String.valueOf(i);
    JLabel number = new JLabel(kok);
    number.setHorizontalAlignment(JLabel.CENTER);
    addComponent(panel, number, 0, gbc.gridy++, 1, 1, normalInsets, GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL);
}
gbc.gridy = 2;

//JTextfield for Mark
for(int i=0; i<7; i++){
    JTextField mark = new JTextField(20);
    addComponent(panel, mark, 1, gbc.gridy++, 1, 1, normalInsets, GridBagConstraints.CENTER,GridBagConstraints.NONE);
}
gbc.gridy = 2;

//JTextfield for Weight
for(int i=0; i<7; i++){
    JTextField weight = new JTextField(20);
    weight.setHorizontalAlignment(JLabel.CENTER);
    addComponent(panel, weight, 2, gbc.gridy++, 1, 1, normalInsets, GridBagConstraints.CENTER,GridBagConstraints.NONE);
}

结果如下：

GridBagLayout 格式错误。 JTextFields 在错误的位置

GridBagLayout format error. JTextFields in wrong positions

java

swing

jtextfield

layout-manager

gridbaglayout