使用b1.addActionListener(new B1()); b2.addActionListener(new B2()); class B1 implements ActionListener { public void actionPerformed(ActionEvent e) { who.setText("Button 1"); } } class B2 implements ActionListener { public void actionPerformed(ActionEvent e) { who.setText("Button 2"); } }代码用Java编写包含两个按钮和一个标签,将发生单击事件的按钮上的文本信息显示在标签中

时间: 2024-02-24 14:00:38 浏览: 19
好的,以下是一个用Java编写的示例程序,实现了你所要求的功能: ```java import javax.swing.*; import java.awt.*; import java.awt.event.*; public class ButtonAndLabelExample extends JFrame { private JLabel label; private JButton button1, button2; public ButtonAndLabelExample() { // 创建窗口 super("Button and Label Example"); setSize(300, 200); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // 创建标签和按钮 label = new JLabel(""); button1 = new JButton("按钮1"); button2 = new JButton("按钮2"); // 添加按钮的单击事件监听器 button1.addActionListener(new B1()); button2.addActionListener(new B2()); // 将标签和按钮添加到窗口 JPanel panel = new JPanel(); panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS)); panel.add(label, BorderLayout.CENTER); panel.add(button1, BorderLayout.PAGE_START); panel.add(button2, BorderLayout.PAGE_END)); add(panel); // 显示窗口 setVisible(true); } class B1 implements ActionListener { public void actionPerformed(ActionEvent e) { // 获取按钮上的文本信息 String text = button1.getText(); // 在标签中显示文本信息 label.setText(text); } } class B2 implements ActionListener { public void actionPerformed(ActionEvent e) { // 获取按钮上的文本信息 String text = button2.getText(); // 在标签中显示文本信息 label.setText(text); } } public static void main(String[] args) { new ButtonAndLabelExample(); } } ``` 当你单击按钮时,按钮上的文本信息将会显示在标签中。你可以根据需要修改按钮的文本和标签的初始文本。在这个示例程序中,我们使用了内部类来实现按钮的单击事件监听器。

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import javax.swing.*; import java.awt.*; import java.awt.BorderLayout; import java.awt.event.*; public class ChatClient extends JPanel { private JFrame frame; private JTextArea textArea; private JTextField textField; private JButton sendButton; private JButton quitButton; public ChatClient() { frame = new JFrame("Chat Client"); textArea = new JTextArea(10, 50); textField = new JTextField(50); sendButton = new JButton("send"); quitButton = new JButton("quit"); } public void launchFrame() { JPanel mainPanel = new JPanel(new BorderLayout()); JPanel buttonPanel = new JPanel(new GridLayout(2, 1)); JPanel sendPanel = new JPanel(new FlowLayout(FlowLayout.RIGHT)); JPanel quitPanel = new JPanel(new FlowLayout(FlowLayout.RIGHT)); sendPanel.add(sendButton); quitPanel.add(quitButton); buttonPanel.add(sendPanel); buttonPanel.add(quitPanel); mainPanel.add(textArea, BorderLayout.CENTER); mainPanel.add(textField, BorderLayout.SOUTH); mainPanel.add(buttonPanel, BorderLayout.EAST); frame.getContentPane().add(mainPanel); // Add listeners sendButton.addActionListener(new SendButtonListener()); quitButton.addActionListener(new QuitButtonListener()); frame.addWindowListener(new CloseWindowListener()); textField.addActionListener(new EnterKeyListener()); frame.pack(); frame.setVisible(true); } public static void main(String[] args) { ChatClient chatClient = new ChatClient(); chatClient.launchFrame(); } class SendButtonListener implements ActionListener { public void actionPerformed(ActionEvent e) { textArea.append(textField.getText() + "\n"); textField.setText(""); } } class QuitButtonListener implements ActionListener { public void actionPerformed(ActionEvent e) { System.exit(0); } } class CloseWindowListener extends WindowAdapter { public void windowClosing(WindowEvent e) { System.exit(0); } } class EnterKeyListener implements ActionListener { public void actionPerformed(ActionEvent e) { textArea.append(textField.getText() + "\n"); textField.setText(""); } }

import java.awt.BorderLayout;import java.awt.CardLayout;import java.awt.Container;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JPanel;public class CardLayoutDemo extends JFrame implements ActionListener { private static final long serialVersionUID = 1L; private Container container; private CardLayout cardLayout; private JPanel cardPanel; private JButton btnFirst, btnPrev, btnNext, btnLast; public CardLayoutDemo() { setTitle("CardLayout Demo"); setSize(500, 500); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setLocationRelativeTo(null); init(); setVisible(true); } private void init() { container = getContentPane(); cardLayout = new CardLayout(); cardPanel = new JPanel(cardLayout); container.add(cardPanel, BorderLayout.CENTER); for (int i = 1; i <= 5; i++) { JButton btn = new JButton("Card " + i); cardPanel.add(btn, "card" + i); } JPanel btnPanel = new JPanel(); btnFirst = new JButton("First"); btnPrev = new JButton("Previous"); btnNext = new JButton("Next"); btnLast = new JButton("Last"); btnFirst.addActionListener(this); btnPrev.addActionListener(this); btnNext.addActionListener(this); btnLast.addActionListener(this); btnPanel.add(btnFirst); btnPanel.add(btnPrev); btnPanel.add(btnNext); btnPanel.add(btnLast); container.add(btnPanel, BorderLayout.SOUTH); } @Override public void actionPerformed(ActionEvent e) { if (e.getSource() == btnFirst) { cardLayout.first(cardPanel); } else if (e.getSource() == btnPrev) { cardLayout.previous(cardPanel); } else if (e.getSource() == btnNext) { cardLayout.next(cardPanel); } else if (e.getSource() == btnLast) { cardLayout.last(cardPanel); } } public static void main(String[] args) { new CardLayoutDemo(); }},这个代码要怎么用,怎么在eclipse里面建工程,需要建哪些工程,并且请对代码逐行解释

package com.yjq.lesson06; //import java.awt.Color; //import java.awt.event.ActionEvent; //import java.awt.event.ActionListener; //import java.awt.event.WindowAdapter; //import java.awt.event.WindowEvent; import javax.swing.; import java.awt.; import java.awt.event.*; public class Test_4 extends JFrame { //三个按钮 JButton jb1,jb2,jb3; //三原色初始值 int r=100,g=100,b=255; JPanel jp=new JPanel(); Test_4() { jp.setBackground(new Color(r,g,b)); jp.setLayout(null); this.setSize(320, 240); this.add(jp); this.addWindowListener(new WindowAdapter() { public void windowClosed(WindowEvent e) { System.exit(0); } }); //对三个按钮的设置 jb1=new JButton("红色"); jb2=new JButton("绿色"); jb3=new JButton("蓝色"); jb1.setBackground(Color.RED); jb2.setBackground(Color.GREEN); jb3.setBackground(Color.BLUE); jb1.setBounds(20,80,80,40); jb2.setBounds(120,80,80,40); jb3.setBounds(220,80,80,40); jb1.addActionListener(new changeColor()); jb2.addActionListener(new changeColor()); jb3.addActionListener(new changeColor()); jp.add(jb1); jp.add(jb2); jp.add(jb3); this.setVisible(true); } private class changeColor implements ActionListener { public void actionPerformed(ActionEvent e) { if(e.getSource()==jb1) { r+=10; if(r>255)r=0; jp.setBackground(new Color(r,g,b)); } if(e.getSource()==jb2) { g+=10; if(g>255) g=0; jp.setBackground(new Color(r,g,b)); } if(e.getSource()==jb3) { b+=10; if(b>255) b=0; jp.setBackground(new Color(r,g,b)); } } } public static void main(String[] args) { new Test_4(); } } 帮我注释一下代码

帮我根据以下要求:Then modify the View superclass to:  hide the frame when the user clicks on the “close” button;  add a “window closing” event handler (use an anonymous window adapter) that calls the controller’s shutdown method.修改下述代码:import javax.swing.JFrame; public abstract class View<T extends Controller> extends JFrame implements ModelListener { protected Model m; protected T c; public View(Model m, T c) { this.m = m; this.c = c; m.addListener(this); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } @Override public abstract void update(); },public class MyFrame extends View<ControllerClicks> { public MyFrame(Model m, ControllerClicks c) { super(m, c); this.setTitle("MyFrame Title"); this.setSize(400, 300); this.setLocationRelativeTo(null); this.setLayout(new BorderLayout()); MyPanel centerPanel = new MyPanel(m, c); this.add(centerPanel, BorderLayout.CENTER); JPanel topPanel = new JPanel(); this.add(topPanel, BorderLayout.PAGE_START); topPanel.setLayout(new FlowLayout(FlowLayout.CENTER)); JButton resetButton = new JButton("Reset"); resetButton.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { c.resetClicked(); } }); topPanel.add(resetButton); JButton undoButton = new JButton("Undo"); undoButton.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { c.undoClicked(); } }); topPanel.add(undoButton); this.setVisible(true); } @Override public void update() { repaint(); // Makes Swing call MyPanel's paintComponent method. } } import javax.swing.JLabel; public class ViewNumber extends View<Controller> { private JLabel label; public ViewNumber(Model m, Controller c) { super(m, c); this.setTitle("View Number"); this.setSize(150, 150); label = new JLabel(); update(); // Initialize the label using the model. this.add(label); this.setVisible(true); } @Override public void update() { label.setText("Number of points is: " + m.numberOfPoints()); } }

优化这段代码import javax.swing.*; import java.awt.*; import java.awt.event.*; public class TemperatureConverter implements ActionListener { private JFrame frame; private JPanel panel; private JLabel Label1,Label2; private JTextField Field1,Field2; private JButton Button1,Button2,Button3; public TemperatureConverter() { frame = new JFrame("温度转换"); f.setSize ( 400,200 ) ; f.setVisible ( true ) ; f.setLocationRelativeTo ( null ) ; panel = new JPanel(); Label1 = new JLabel("摄氏度:"); Label2 = new JLabel("华氏度:"); Field1 = new JTextField(10); Field2 = new JTextField(10); Button1 = new Button("摄氏度 → 华氏度"); Button2 = new Button("华氏度 → 摄氏度"); Button3 = new Button("清空"); panel.add(Label1); panel.add(Label2); panel.add(Field1); panel.add(Field2); panel.add(Button1); panel.add(Button2); panel.add(Button3); Button1.addActionListener(this); Button2.addActionListener(this); Button3.addActionListener(this); public void actionPerformed(ActionEvent e) { if (e.getSource() == Button1) { double value = Double.parseDouble(Field1.getText()); double result = (value * 9 / 5) + 32; Field1.setText(String.format("%.2f", result)); } if (e.getSource() == Button2) { double value = Double.parseDouble(Field2.getText()); double result = (value - 32) * 5 / 9; Field1.setText(String.format("%.2f", result)); } if(e.getActionCommand().equals("清空") ) { Field1.setText(null); Field2.setText(null); } } } } public static void main(String[] args) { new TemperatureConverter(); }

import javax.swing.*;import java.awt.*;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;public class DormitoryManagementLogin extends JFrame implements ActionListener { private JLabel titleLabel, usernameLabel, passwordLabel; private JTextField usernameField; private JPasswordField passwordField; private JButton loginButton, resetButton; public DormitoryManagementLogin() { super("Dormitory Management Login"); setSize(400, 300); setDefaultCloseOperation(EXIT_ON_CLOSE); titleLabel = new JLabel("Dormitory Management Login"); titleLabel.setFont(new Font("Arial", Font.BOLD, 20)); titleLabel.setForeground(Color.BLUE); titleLabel.setHorizontalAlignment(JLabel.CENTER); usernameLabel = new JLabel("Username:"); passwordLabel = new JLabel("Password:"); usernameField = new JTextField(); passwordField = new JPasswordField(); loginButton = new JButton("Login"); resetButton = new JButton("Reset"); loginButton.addActionListener(this); resetButton.addActionListener(this); JPanel panel = new JPanel(new GridLayout(3, 2)); panel.add(usernameLabel); panel.add(usernameField); panel.add(passwordLabel); panel.add(passwordField); panel.add(loginButton); panel.add(resetButton); add(titleLabel, BorderLayout.NORTH); add(panel, BorderLayout.CENTER); setVisible(true); } @Override public void actionPerformed(ActionEvent e) { if (e.getSource() == loginButton) { String username = usernameField.getText(); String password = String.valueOf(passwordField.getPassword()); // 在这里添加登录验证逻辑 JOptionPane.showMessageDialog(this, "登录成功!"); // 登录成功后跳转到宿舍管理主界面 new DormitoryManagementMain(); dispose(); } else if (e.getSource() == resetButton) { usernameField.setText(""); passwordField.setText(""); } } public static void main(String[] args) { new DormitoryManagementLogin(); }}请修改代码错误

import javax.swing.; import java.awt.; import java.awt.event.*; public class Login extends JFrame implements ActionListener { private JLabel usernameLabel, passwordLabel; private JTextField usernameField; private JPasswordField passwordField; private JButton loginButton, exitButton; public Login() { super("登录页面"); this.setLayout(new GridLayout(3, 2)); usernameLabel = new JLabel("用户名:"); this.add(usernameLabel); usernameField = new JTextField(10); this.add(usernameField); passwordLabel = new JLabel("密码:"); this.add(passwordLabel); passwordField = new JPasswordField(10); this.add(passwordField); loginButton = new JButton("登录"); loginButton.addActionListener(this); this.add(loginButton); exitButton = new JButton("退出"); exitButton.addActionListener(this); this.add(exitButton); this.pack(); this.setLocationRelativeTo(null); this.setVisible(true); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } public void actionPerformed(ActionEvent e) { if (e.getSource() == loginButton) { String username = usernameField.getText(); String password = new String(passwordField.getPassword()); if (username.equals("admin") && password.equals("admin")) { JOptionPane.showMessageDialog(this, "登录成功!"); new FiveChessFrame(); this.dispose(); } else { JOptionPane.showMessageDialog(this, "用户名或密码错误!"); } } else if (e.getSource() == exitButton) { System.exit(0); } } public static void main(String[] args) { new Login(); } }给这段代码排版好看一点,美化一下

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