复选框——Checkbox的实例使用

import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

public class Ex_Checkbox extends Frame{
	Checkbox c1,c2,c3,c4;
	Panel p,panel;
	Label label;
	public Ex_Checkbox(String title) {
		super(title);
		c1= new Checkbox("C语言",false);//"C语言" 是标签内容，false指定状态 （不打勾）
		c2= new Checkbox("java",false);
		c3= new Checkbox("Nosql",true);		//true 默认 √
		c4= new Checkbox("python");
		label = new Label("你喜欢哪种语言？");
		p = new Panel();
		panel = new Panel();
		p.add(label);
		panel.add(c1);
		panel.add(c2);
		panel.add(c3);
		panel.add(c4);
		add(p);
		p.add(panel);
		setSize(300,180);
		setVisible(true);
		addWindowListener(new WindowAdapter() {public void windowClosing(WindowEvent e) {System.exit(0);}});
		} 
	public static void main(String arg[]) {
		new Ex_Checkbox("复选框");
	}
}