jlab1001a.java

计算机系学习java的专用ppt

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class JLab1001A extends JFrame {
    private Button button;
    private TextField textfield;
    int i=0;
    public JLab1001A(){
       Container container = getContentPane();
       container.setLayout(new FlowLayout());
       button = new Button("INC");
       textfield = new TextField("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) {
         Button btn = (Button)event.getSource(); 
         if(btn==button){
            i++;
			      textfield.setText(String.valueOf(i)); 
			   }
    }
 
}
 
   public static void main(String[] args) {
       JLab1001A app = new JLab1001A();
       app.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
}