求助：写了一个代码，想让label中的话都显示出来 - JAVA论坛

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求助：写了一个代码，想让label中的话都显示出来

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 ]

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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"); } } }

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"); } } }

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"); } } }