import java.awt.Button;
import java.awt.FlowLayout;
import java.awt.Frame;
import java.awt.Label;
import java.awt.Panel;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;


public class ButtonEvent1 extends Frame{
    public static void main(String[] args) {
        new ButtonEvent();
    }
    Button button=new Button("测试按钮");
    Panel panel=new Panel();
    Label label=new Label("");
    public ButtonEvent1(){
        
        super("按钮的事件处理");
        this.setLayout(new FlowLayout());
        panel.add(button);
        panel.add(label);
        this.add(panel);
        button.addActionListener(new MyEvent());//添加监听
        setSize(250,120);
        this.setVisible(true);
    }
    //内部类，处理单击事件
    class MyEvent implements ActionListener{
        public void actionPerformed(ActionEvent e) {
            
            label.setText("你单击了按钮");
//            System.out.println();
        }
        
    }

}
要求：当单击按钮的时候在标签上面显示你单击了按钮


[ 本帖最后由 散页 于 2012-11-28 13:44 编辑 ]

除了JLabel label=new JLabel("你单击了按钮");这种方法还有其他的吗？

其实那就话显示出来了.......你移动下边框，他就全部出来了...至于原因...同求。

import java.awt.Button;
import java.awt.FlowLayout;
import java.awt.Frame;
import java.awt.Label;
import java.awt.Panel;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class ButtonEvent1 extends Frame{
    public static void main(String[] args) {
        new ButtonEvent1();
    }
    Button button=new Button("测试按钮");
    Panel panel=new Panel();
    Label label=new Label("");
    public ButtonEvent1(){
       

        super("按钮的事件处理");
        this.setLayout(new FlowLayout());
//        panel=(JPanel)this.getContentPane();
        panel.add(button);
        panel.add(label);
           this.add(panel);
        button.addActionListener(new MyEvent());//添加监听
        setSize(250,120);
        this.setVisible(true);
      

    }
   

    //内部类，处理单击事件
    class MyEvent implements ActionListener{
        public void actionPerformed(ActionEvent e) {
            panel.setSize(250, 120);     //panel内的东东变大了，所以panel也要重新指定大小
            label.setSize(50, 50);        //label内容变多了，所以需要重新指定大小
            label.setText("你单击了按钮");
        }
       

    }

}

或者这样实现

import java.awt.Button;
import java.awt.FlowLayout;
import java.awt.Frame;
import java.awt.Label;
import java.awt.Panel;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class ButtonEvent1 extends JFrame{
    public static void main(String[] args) {
        new ButtonEvent1();
    }
    Button button=new Button("测试按钮");
    JPanel panel=new JPanel();
    JLabel label=new JLabel("");
    public ButtonEvent1(){
       

        super("按钮的事件处理");
        this.setLayout(new FlowLayout());
        panel=(JPanel)this.getContentPane();
        panel.add(button);
        panel.add(label);
//           this.add(panel);
        button.addActionListener(new MyEvent());//添加监听
        setSize(250,120);
        this.setVisible(true);
      

    }
   

    //内部类，处理单击事件
    class MyEvent implements ActionListener{
        public void actionPerformed(ActionEvent e) {
//            panel.setSize(250, 120);
//            label.setSize(50, 50);
            label.setText("你单击了按钮");
        }
       

    }

}

大小问题……这就不叫问题，设置一下打小

不想用JLabel已经给定窗口大小了，不用改变窗口的大小，怎么把“你单击了按钮”这句话显示出来？帮帮忙，谢谢！

布局的问题

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;


@SuppressWarnings("serial")
public class ButtonEvent extends Frame{
    public static void main(String[] args) {
        new ButtonEvent();
    }
    Button button=new Button("测试按钮");
    Panel panel=new Panel();
    Label label=new Label();
    public ButtonEvent(){
        panel.setLayout(new GridLayout());
        panel.add(button);
        panel.add(label);
        this.add(panel,BorderLayout.SOUTH);
        button.addActionListener(new MyEvent());//添加监听
        setSize(300,90);
        this.setVisible(true);
    }
    //内部类，处理单击事件
    class MyEvent implements ActionListener{
        public void actionPerformed(ActionEvent e) {
            label.setText("你单击了按钮");
        }
    }
}