carcounter.java

来自「简单的java入门编程」· Java 代码 · 共 29 行

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class CarCounter extends JFrame
    implements ActionListener {
	private int carCount=0;
	private JButton button;
	
	public static void  main (String[] args){
	CarCounter frame =new CarCounter();
	frame.setSize (300,200);
	frame.createGUI();
	frame.show();
}
private void createGUI(){
	setDefaultCloseOperation(EXIT_ON_CLOSE);
	Container window =getContentPane();
	window.setLayout(new FlowLayout());
	
	button=new JButton("Car Entering");
	window.add(button);
	button.addActionListener(this);
}
	public void actionPerformed(ActionEvent event){
		carCount=carCount+1;
		JOptionPane.showMessageDialog(null,"Cars:"+carCount);
		
	}
}