package second;import java.awt.Color;import java.awt.Frame;import java.awt.event.WindowAdapter;import java.awt.event.WindowEvent;import java.awt.*;public class Window extends Frame {    public Window(String string){        super(string);//调用父类构造方法    }    public static void main(String[] args){        Window w = new Window("我的第一个window!!");//实例化        w.setSize(500,300);//设置窗口大小        w.setBackground(Color.blue);//背景颜色        w.setTitle("哈哈，我才是第一个!");//标题        w.setLayout(null);//取消布局管理器        w.setVisible(true);//显示        w.addWindowListener(w.new writeWindow());//添加窗口监视器    }    class writeWindow extends WindowAdapter {        public void windowClosing(WindowEvent e){//监视关闭            System.exit(0);        }    }}