java 按钮事件

代码如下，注意注释：

import java.awt.Container;

import java.awt.event.*;

import javax.swing.*;

public class ShortTest2 extends JFrame implements ActionListener { JButton jb1;

JPanel j1;

public ShortTest2() {

Container contentPane = this.getContentPane();

j1 = new JPanel();

jb1 = new JButton("Draw");

jb1.addActionListener(this);

j1.add(jb1);

contentPane.add(j1, "North");

}

public static void main(String[] args) {

ShortTest2 m = new ShortTest2();

m.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

m.setSize(600, 370);

m.setLocationRelativeTo(null);

m.setVisible(true);

}

public void actionPerformed(ActionEvent ae) {

//主要是这里，按钮一按就执行下面的代码

JOptionPane.showMessageDialog(null, "Hello World!");

}

}

java点击按钮，出现另一个窗口

第一个窗体LoginFrame.java：

package winRelation;

import java.awt.Dimension;

import java.awt.Rectangle;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JOptionPane;

public class LoginFrame extends JFrame {

JButton button = new JButton("点击我");

class LoginOKAction implements ActionListener {

public void actionPerformed(ActionEvent e) {

JOptionPane.showMessageDialog(null, "将进入另一个窗体！");

new MainFrame();

setVisible(false);

}

}

public LoginFrame(){

super();

this.setResizable(false);

this.setSize(new Dimension(300, 205));

this.setTitle("第一个窗体");

this.setLayout(null);

this.setDefaultCloseOperation(EXIT_ON_CLOSE);

this.setLocation(300, 200);

this.setVisible(true);

this.getContentPane().add(button, null);

button.setBounds(new Rectangle(111, 70, 78, 27));

button.addActionListener(new LoginOKAction());//给按钮加事件监听器}

public static void main(String[] args) {

new LoginFrame();

}

}

第二个窗体MainFrame.java：

package winRelation;

import java.awt.BorderLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JDesktopPane;

import javax.swing.JFrame;

import javax.swing.JInternalFrame;

import javax.swing.JMenu;

import javax.swing.JMenuBar;

import javax.swing.JMenuItem;

import javax.swing.JToolBar;

public class MainFrame extends JFrame{

private static final JDesktopPane DESKTOP_PANE = new JDesktopPane();

public MainFrame() {

super("这是主窗体");

setSize(640, 480);

//菜单设置

JMenuBar menuBar = new JMenuBar();

this.setJMenuBar(menuBar);

JMenu menu1 = new JMenu("菜单1");

JMenu menu101 = new JMenu("菜单101");

JMenuItem menu10101 = new JMenuItem("菜单10101");

JMenuItem menu102 = new JMenuItem("菜单102");

menu102.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

addIFame(new InternalFrame());

}

});

menu101.add(menu10101);

menu1.add(menu101);

menu1.add(menu102);

JMenu menu2 = new JMenu("菜单2");

menuBar.add(menu1);

menuBar.add(menu2);

this.getContentPane().add(DESKTOP_PANE);

this.setVisible(true);

}

public static void addIFame(JInternalFrame iframe) { // 添加子窗体的方法