jlab1001.java

来自「计算机系学习java的专用ppt」· Java 代码 · 共 38 行

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class JLab1001 extends JFrame {
    private JButton button;
    private JTextField textfield;
    int i=0;
    public JLab1001(){
       Container container = getContentPane();
       container.setLayout(new FlowLayout());
       button = new JButton("INC");
       JTextField textfield = new JTextField("0",5);
       EventHandler handler = new EventHandler();
       container.add(button);
       container.add(textfield);
       setSize(200,150);
       setVisible(true);
       button.addMouseListener(handler);
       }
       class EventHandler extends MouseAdapter { 
        
       public void mouseClicked(MouseEvent event) {
         JButton btn = (JButton)event.getSource(); 
         if(btn==button){
            i++;
			      textfield.setText(String.valueOf(i)); 
			   }
    }
 
}
 
   public static void main(String[] args) {
       JLab1001 app = new JLab1001();
       app.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
}