如何在 Java 中将 int 和 string 的值从一个程序传输到另一个程序
How can I transfer values of an int and string from one program to another in Java
好的，所以在我的代码中，我要求用户提供他们的姓名，并要求他们单击 3 个按钮之一，这会为变量提供相应的值。现在在另一个程序中，我想调用这个程序，然后几乎显示字符串并将 int 值用于特定目的。
public class MainMenuofgame extends JFrame implements ActionListener{
JButton slow, medium, fast;
JLabel pic1, pic2, pic3, pic4;
JTextField username;
Container frame;
static String name;
static int xspeed = 0;
public MainMenuofgame() {
super ("Main Menu of Rocket Launch");
frame = getContentPane ();
frame.setLayout (null);
pic1 = new JLabel (new ImageIcon ("welcome.png"));
pic2 = new JLabel (new ImageIcon ("name.png"));
pic3 = new JLabel (new ImageIcon ("speed.png"));
pic4 = new JLabel (new ImageIcon ("backgnd.jpg"));
username = new JTextField ();
slow = new JButton("Slow");
// slow.setActionCommand("slowspeed");
slow.addActionListener (this);
medium = new JButton("Medium");
// medium.setActionCommand("mediumspeed");
medium.addActionListener (this);
fast = new JButton("Fast");
// fast.setActionCommand("fastspeed");
fast.addActionListener (this);
pic1.setBounds (30,50, 525, 173);//welcome
pic2.setBounds (100,230,212,73);//name
pic3.setBounds (80,350,428,84);//speed
username.setBounds(310,255,150,30);
slow.setBounds (100,450,100,100);
medium.setBounds (250,450,100,100);
fast.setBounds (400,450,100,100);
//background bound goes in the end
pic4.setBounds (0,0, 600,900);
frame.add (pic1);
frame.add (pic2);
frame.add (pic3);
frame.add (username);
frame.add (slow);
frame.add (medium);
frame.add (fast);
frame.add (pic4);
setSize(600, 900);
setVisible (true);
setDefaultCloseOperation (EXIT_ON_CLOSE);
}
public void actionPerformed (ActionEvent evt){
String name = username.getText();
if (evt.getSource () == slow)
{
xspeed = 1;
}
else if(evt.getSource () == medium)
{
xspeed = 5;
}
else
{
xspeed = 10;
}
}
public static void main(String[] args) {
new MainMenuofgame ();
}
}
关于如何将信息从一个程序传输到另一个程序，有两种方法之一...
- 客户端-服务器应用程序
这需要您有第三个应用程序 运行 通过套接字从其他两个应用程序（客户端）中的每一个接收信息。更多信息 Google "Client-Server applications in Java"
- 有一个文本文件传递信息
为此，您应该有一个文本文件，一个应用程序在其中存储信息，而另一个应用程序只是简单地读取它...这是一个更简单的解决方案，但学习经验较少。这是示例代码。
应用程序 1：
private void storeMessage(String msg){
File centralFile = new File("path to your file");
BufferedWriter writer = new BufferedWriter(new FileWriter(centralFile));
writer.write(msg);
writer.close();
}
应用程序 2：
private String getMessage(){
File centralFile = new File("path to your file");
String msg = "";
BufferedReader reader = new BufferedReader(new FileReader(centralFile));
while (reader.hasNextLine()){
msg += reader.nextLine();
}
reader.close();
return msg;
}
希望对您有所帮助
您描述的行为实际上并不是 "transfer values of an int and string from one program to another in Java"，而是更简单的将数据从一个对象传输到另一个对象，这里的对象是由 GUI 组件表示。不要创建两个单独的程序，而是创建以有意义的方式交互的单独对象。这就是 Java 的 OOP 的本质。最简单的解决方案是让主应用程序在模态对话框（例如模态 JDialog）中显示子应用程序的 GUI，然后在处理完对话框（即不再可见）后，主应用程序 program/object在对话框中查询其组件的状态 -- 输入的数据。
此外，让 class 扩展 JFrame 是在逼迫自己创建和显示 JFrame，而这通常需要更大的灵活性。事实上，我敢说我创建的和看到的大部分 Swing GUI 代码 没有 扩展 JFrame，事实上，您很少会想做这个。更常见的是，您的 GUI classes 将适用于创建 JPanel，然后可以将其放入 JFrames 或 JDialogs，或 JTabbedPanes，或通过 CardLayouts 在任何需要的地方进行交换。这将大大增加您的 GUI 编码的灵活性。
例如：
import java.awt.Component;
import java.awt.Dialog.ModalityType;
import java.awt.Dimension;
import java.awt.Window;
import java.awt.event.ActionEvent;
import javax.swing.*;
@SuppressWarnings("serial")
public class MenuDemoMainPanel extends JPanel {
private MenuPanel menuPanel = new MenuPanel();
private JDialog menuDialog = null;
private String name;
private Speed speed;
private JTextField nameField = new JTextField(10);
private JTextField speedField = new JTextField(10);
public MenuDemoMainPanel() {
// these fields are for display only and should not allow user
// interaction
nameField.setFocusable(false);
speedField.setFocusable(false);
// not kosher to set this directly, per kleopatra, but oh well
setPreferredSize(new Dimension(600, 400));
// simple demo GUI -- add components
add(new JLabel("Name:"));
add(nameField);
add(new JLabel("Speed:"));
add(speedField);
add(new JButton(new GetNameAndSpeedAction("Get Name And Speed")));
}
// action for JButton that displays the menuDialog JDialog
private class GetNameAndSpeedAction extends AbstractAction {
public GetNameAndSpeedAction(String name) {
super(name);
int mnemonic = (int) name.charAt(0);
putValue(MNEMONIC_KEY, mnemonic);
}
@Override
public void actionPerformed(ActionEvent e) {
if (menuDialog == null) {
// if the menu dialog has not been created yet -- create it
Window win = SwingUtilities.getWindowAncestor(MenuDemoMainPanel.this);
menuDialog = new JDialog(win, "Menu", ModalityType.APPLICATION_MODAL);
menuDialog.add(menuPanel);
menuDialog.pack();
menuDialog.setLocationRelativeTo(win);
}
// display the menu JDialog
menuDialog.setVisible(true);
// this code is called only when the dialog is no longer visible
// query the dialog for the state it holds
name = menuPanel.getNameText();
speed = menuPanel.getSpeed();
// and display the state in the main GUI
if (name != null && speed != null) {
nameField.setText(name);
speedField.setText(speed.getText());
}
}
}
private static void createAndShowGui() {
// create the main GUI JPanel
MenuDemoMainPanel mainPanel = new MenuDemoMainPanel();
// then create an application GUI
JFrame frame = new JFrame("Menu Demo -- Main GUI");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.getContentPane().add(mainPanel); // place the main panel into the GUI
// and pack and display it:
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> createAndShowGui());
}
}
// JPanel to hold menu dialog components
@SuppressWarnings("serial")
class MenuPanel extends JPanel {
private JComboBox<Speed> speedCombo = new JComboBox<>(Speed.values());
private JTextField nameField = new JTextField(10);
public MenuPanel() {
speedCombo.setSelectedIndex(-1);
add(new JLabel("Name:"));
add(nameField);
add(new JLabel("Speed:"));
add(speedCombo);
add(new JButton(new SubmitAction("Submit")));
}
// allow outside classes to query the nameField JTextField's state
public String getNameText() {
return nameField.getText();
}
// allow outside classes to query the speedCombo JComboBox's state
public Speed getSpeed() {
return (Speed) speedCombo.getSelectedItem();
}
// Action for JButton that submits the dialog to the main GUI
private class SubmitAction extends AbstractAction {
public SubmitAction(String name) {
super(name);
int mnemonic = (int) name.charAt(0);
putValue(MNEMONIC_KEY, mnemonic);
}
@Override
public void actionPerformed(ActionEvent arg0) {
// if the data is not all entered or selected
if (nameField.getText().trim().isEmpty() || speedCombo.getSelectedIndex() == -1) {
Component comp = MenuPanel.this;
String msg = "You must enter your name and select a speed";
String title = "Invalid Data";
int msgType = JOptionPane.ERROR_MESSAGE;
// warn the user and leave this dialog still visible
JOptionPane.showMessageDialog(comp, msg, title, msgType);
} else {
// otherwise dispose of this dialog and thereby pass control
// back to the main application / GUI
Window win = SwingUtilities.getWindowAncestor(MenuPanel.this);
win.dispose();
}
}
}
}
// an enum to encapsulate possible game speeds
enum Speed {
SLOW("Slow"), MEDIUM("Medium"), FAST("Fast");
private String text;
private Speed(String text) {
this.text = text;
}
public String getText() {
return text;
}
@Override
public String toString() {
return getText();
}
}
嗯……我真正需要做的就是调用我想存储数据的变量，然后……存储它。这是在底部的 If 语句中完成的。感谢大家的帮助，但老实说，你们的大部分回答提出的问题比我回答的要多，这让我很困惑，但我想通了，所以还是谢谢 :)
public class MainMenuofgame extends JFrame implements ActionListener{
JButton slow, medium, fast;
JLabel pic1, pic2, pic3, pic4;
JTextField username;
Container frame;
static String name;
static int xspeed = 0;
public MainMenuofgame() {
super ("Main Menu of Rocket Launch");
frame = getContentPane ();
frame.setLayout (null);
pic1 = new JLabel (new ImageIcon ("welcome.png"));
pic2 = new JLabel (new ImageIcon ("name.png"));
pic3 = new JLabel (new ImageIcon ("speed.png"));
pic4 = new JLabel (new ImageIcon ("backgnd.jpg"));
username = new JTextField ();
slow = new JButton("Slow");
// slow.setActionCommand("slowspeed");
slow.addActionListener (this);
medium = new JButton("Medium");
// medium.setActionCommand("mediumspeed");
medium.addActionListener (this);
fast = new JButton("Fast");
// fast.setActionCommand("fastspeed");
fast.addActionListener (this);
pic1.setBounds (30,50, 525, 173);//welcome
pic2.setBounds (100,230,212,73);//name
pic3.setBounds (80,350,428,84);//speed
username.setBounds(310,255,150,30);
slow.setBounds (100,450,100,100);
medium.setBounds (250,450,100,100);
fast.setBounds (400,450,100,100);
//background bound goes in the end
pic4.setBounds (0,0, 600,900);
frame.add (pic1);
frame.add (pic2);
frame.add (pic3);
frame.add (username);
frame.add (slow);
frame.add (medium);
frame.add (fast);
frame.add (pic4);
setSize(600, 900);
setVisible (true);
setDefaultCloseOperation (EXIT_ON_CLOSE);
}
public void actionPerformed (ActionEvent evt){
String name = username.getText();
Rocketlaunch.name = name;
if (evt.getSource () == slow)
{
Rocketlaunch.moveSpeed = 1;
Rocketlaunch.speed = "Slow";
setVisible (false);
}
else if(evt.getSource () == medium)
{
Rocketlaunch.moveSpeed = 5;
Rocketlaunch.speed = "Medium";
setVisible (false);
}
else
{
Rocketlaunch.moveSpeed = 10;
Rocketlaunch.speed = "Fast";
setVisible (false);
}
new Rocketlaunch();
}
public static void main(String[] args) {
new MainMenuofgame ();
}
}
好的，所以在我的代码中，我要求用户提供他们的姓名，并要求他们单击 3 个按钮之一，这会为变量提供相应的值。现在在另一个程序中，我想调用这个程序，然后几乎显示字符串并将 int 值用于特定目的。
public class MainMenuofgame extends JFrame implements ActionListener{
JButton slow, medium, fast;
JLabel pic1, pic2, pic3, pic4;
JTextField username;
Container frame;
static String name;
static int xspeed = 0;
public MainMenuofgame() {
super ("Main Menu of Rocket Launch");
frame = getContentPane ();
frame.setLayout (null);
pic1 = new JLabel (new ImageIcon ("welcome.png"));
pic2 = new JLabel (new ImageIcon ("name.png"));
pic3 = new JLabel (new ImageIcon ("speed.png"));
pic4 = new JLabel (new ImageIcon ("backgnd.jpg"));
username = new JTextField ();
slow = new JButton("Slow");
// slow.setActionCommand("slowspeed");
slow.addActionListener (this);
medium = new JButton("Medium");
// medium.setActionCommand("mediumspeed");
medium.addActionListener (this);
fast = new JButton("Fast");
// fast.setActionCommand("fastspeed");
fast.addActionListener (this);
pic1.setBounds (30,50, 525, 173);//welcome
pic2.setBounds (100,230,212,73);//name
pic3.setBounds (80,350,428,84);//speed
username.setBounds(310,255,150,30);
slow.setBounds (100,450,100,100);
medium.setBounds (250,450,100,100);
fast.setBounds (400,450,100,100);
//background bound goes in the end
pic4.setBounds (0,0, 600,900);
frame.add (pic1);
frame.add (pic2);
frame.add (pic3);
frame.add (username);
frame.add (slow);
frame.add (medium);
frame.add (fast);
frame.add (pic4);
setSize(600, 900);
setVisible (true);
setDefaultCloseOperation (EXIT_ON_CLOSE);
}
public void actionPerformed (ActionEvent evt){
String name = username.getText();
if (evt.getSource () == slow)
{
xspeed = 1;
}
else if(evt.getSource () == medium)
{
xspeed = 5;
}
else
{
xspeed = 10;
}
}
public static void main(String[] args) {
new MainMenuofgame ();
}
}
关于如何将信息从一个程序传输到另一个程序，有两种方法之一...
- 客户端-服务器应用程序
这需要您有第三个应用程序 运行 通过套接字从其他两个应用程序（客户端）中的每一个接收信息。更多信息 Google "Client-Server applications in Java"
- 有一个文本文件传递信息
为此，您应该有一个文本文件，一个应用程序在其中存储信息，而另一个应用程序只是简单地读取它...这是一个更简单的解决方案，但学习经验较少。这是示例代码。
应用程序 1：
private void storeMessage(String msg){
File centralFile = new File("path to your file");
BufferedWriter writer = new BufferedWriter(new FileWriter(centralFile));
writer.write(msg);
writer.close();
}
应用程序 2：
private String getMessage(){
File centralFile = new File("path to your file");
String msg = "";
BufferedReader reader = new BufferedReader(new FileReader(centralFile));
while (reader.hasNextLine()){
msg += reader.nextLine();
}
reader.close();
return msg;
}
希望对您有所帮助
您描述的行为实际上并不是 "transfer values of an int and string from one program to another in Java"，而是更简单的将数据从一个对象传输到另一个对象，这里的对象是由 GUI 组件表示。不要创建两个单独的程序，而是创建以有意义的方式交互的单独对象。这就是 Java 的 OOP 的本质。最简单的解决方案是让主应用程序在模态对话框（例如模态 JDialog）中显示子应用程序的 GUI，然后在处理完对话框（即不再可见）后，主应用程序 program/object在对话框中查询其组件的状态 -- 输入的数据。
此外，让 class 扩展 JFrame 是在逼迫自己创建和显示 JFrame，而这通常需要更大的灵活性。事实上，我敢说我创建的和看到的大部分 Swing GUI 代码 没有 扩展 JFrame，事实上，您很少会想做这个。更常见的是，您的 GUI classes 将适用于创建 JPanel，然后可以将其放入 JFrames 或 JDialogs，或 JTabbedPanes，或通过 CardLayouts 在任何需要的地方进行交换。这将大大增加您的 GUI 编码的灵活性。
例如：
import java.awt.Component;
import java.awt.Dialog.ModalityType;
import java.awt.Dimension;
import java.awt.Window;
import java.awt.event.ActionEvent;
import javax.swing.*;
@SuppressWarnings("serial")
public class MenuDemoMainPanel extends JPanel {
private MenuPanel menuPanel = new MenuPanel();
private JDialog menuDialog = null;
private String name;
private Speed speed;
private JTextField nameField = new JTextField(10);
private JTextField speedField = new JTextField(10);
public MenuDemoMainPanel() {
// these fields are for display only and should not allow user
// interaction
nameField.setFocusable(false);
speedField.setFocusable(false);
// not kosher to set this directly, per kleopatra, but oh well
setPreferredSize(new Dimension(600, 400));
// simple demo GUI -- add components
add(new JLabel("Name:"));
add(nameField);
add(new JLabel("Speed:"));
add(speedField);
add(new JButton(new GetNameAndSpeedAction("Get Name And Speed")));
}
// action for JButton that displays the menuDialog JDialog
private class GetNameAndSpeedAction extends AbstractAction {
public GetNameAndSpeedAction(String name) {
super(name);
int mnemonic = (int) name.charAt(0);
putValue(MNEMONIC_KEY, mnemonic);
}
@Override
public void actionPerformed(ActionEvent e) {
if (menuDialog == null) {
// if the menu dialog has not been created yet -- create it
Window win = SwingUtilities.getWindowAncestor(MenuDemoMainPanel.this);
menuDialog = new JDialog(win, "Menu", ModalityType.APPLICATION_MODAL);
menuDialog.add(menuPanel);
menuDialog.pack();
menuDialog.setLocationRelativeTo(win);
}
// display the menu JDialog
menuDialog.setVisible(true);
// this code is called only when the dialog is no longer visible
// query the dialog for the state it holds
name = menuPanel.getNameText();
speed = menuPanel.getSpeed();
// and display the state in the main GUI
if (name != null && speed != null) {
nameField.setText(name);
speedField.setText(speed.getText());
}
}
}
private static void createAndShowGui() {
// create the main GUI JPanel
MenuDemoMainPanel mainPanel = new MenuDemoMainPanel();
// then create an application GUI
JFrame frame = new JFrame("Menu Demo -- Main GUI");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.getContentPane().add(mainPanel); // place the main panel into the GUI
// and pack and display it:
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> createAndShowGui());
}
}
// JPanel to hold menu dialog components
@SuppressWarnings("serial")
class MenuPanel extends JPanel {
private JComboBox<Speed> speedCombo = new JComboBox<>(Speed.values());
private JTextField nameField = new JTextField(10);
public MenuPanel() {
speedCombo.setSelectedIndex(-1);
add(new JLabel("Name:"));
add(nameField);
add(new JLabel("Speed:"));
add(speedCombo);
add(new JButton(new SubmitAction("Submit")));
}
// allow outside classes to query the nameField JTextField's state
public String getNameText() {
return nameField.getText();
}
// allow outside classes to query the speedCombo JComboBox's state
public Speed getSpeed() {
return (Speed) speedCombo.getSelectedItem();
}
// Action for JButton that submits the dialog to the main GUI
private class SubmitAction extends AbstractAction {
public SubmitAction(String name) {
super(name);
int mnemonic = (int) name.charAt(0);
putValue(MNEMONIC_KEY, mnemonic);
}
@Override
public void actionPerformed(ActionEvent arg0) {
// if the data is not all entered or selected
if (nameField.getText().trim().isEmpty() || speedCombo.getSelectedIndex() == -1) {
Component comp = MenuPanel.this;
String msg = "You must enter your name and select a speed";
String title = "Invalid Data";
int msgType = JOptionPane.ERROR_MESSAGE;
// warn the user and leave this dialog still visible
JOptionPane.showMessageDialog(comp, msg, title, msgType);
} else {
// otherwise dispose of this dialog and thereby pass control
// back to the main application / GUI
Window win = SwingUtilities.getWindowAncestor(MenuPanel.this);
win.dispose();
}
}
}
}
// an enum to encapsulate possible game speeds
enum Speed {
SLOW("Slow"), MEDIUM("Medium"), FAST("Fast");
private String text;
private Speed(String text) {
this.text = text;
}
public String getText() {
return text;
}
@Override
public String toString() {
return getText();
}
}
嗯……我真正需要做的就是调用我想存储数据的变量，然后……存储它。这是在底部的 If 语句中完成的。感谢大家的帮助，但老实说，你们的大部分回答提出的问题比我回答的要多，这让我很困惑，但我想通了，所以还是谢谢 :)
public class MainMenuofgame extends JFrame implements ActionListener{
JButton slow, medium, fast;
JLabel pic1, pic2, pic3, pic4;
JTextField username;
Container frame;
static String name;
static int xspeed = 0;
public MainMenuofgame() {
super ("Main Menu of Rocket Launch");
frame = getContentPane ();
frame.setLayout (null);
pic1 = new JLabel (new ImageIcon ("welcome.png"));
pic2 = new JLabel (new ImageIcon ("name.png"));
pic3 = new JLabel (new ImageIcon ("speed.png"));
pic4 = new JLabel (new ImageIcon ("backgnd.jpg"));
username = new JTextField ();
slow = new JButton("Slow");
// slow.setActionCommand("slowspeed");
slow.addActionListener (this);
medium = new JButton("Medium");
// medium.setActionCommand("mediumspeed");
medium.addActionListener (this);
fast = new JButton("Fast");
// fast.setActionCommand("fastspeed");
fast.addActionListener (this);
pic1.setBounds (30,50, 525, 173);//welcome
pic2.setBounds (100,230,212,73);//name
pic3.setBounds (80,350,428,84);//speed
username.setBounds(310,255,150,30);
slow.setBounds (100,450,100,100);
medium.setBounds (250,450,100,100);
fast.setBounds (400,450,100,100);
//background bound goes in the end
pic4.setBounds (0,0, 600,900);
frame.add (pic1);
frame.add (pic2);
frame.add (pic3);
frame.add (username);
frame.add (slow);
frame.add (medium);
frame.add (fast);
frame.add (pic4);
setSize(600, 900);
setVisible (true);
setDefaultCloseOperation (EXIT_ON_CLOSE);
}
public void actionPerformed (ActionEvent evt){
String name = username.getText();
Rocketlaunch.name = name;
if (evt.getSource () == slow)
{
Rocketlaunch.moveSpeed = 1;
Rocketlaunch.speed = "Slow";
setVisible (false);
}
else if(evt.getSource () == medium)
{
Rocketlaunch.moveSpeed = 5;
Rocketlaunch.speed = "Medium";
setVisible (false);
}
else
{
Rocketlaunch.moveSpeed = 10;
Rocketlaunch.speed = "Fast";
setVisible (false);
}
new Rocketlaunch();
}
public static void main(String[] args) {
new MainMenuofgame ();
}
}