我的一个Frame（java）

import java.awt.Color;import java.awt.Color;import java.awt.Frame;import java.awt.event.WindowEvent;import java.awt.event.WindowAdapter;public class MyJava extends Frame{public MyJava(String FormName){super(FormName);}public static void main(String [] args){MyJava FirstFrame=new MyJava("This is my first Frame");FirstFrame.setSize(200,140);//FirstFrame.setBackgroud(Color.BLUE);         //一直未成功，这是为什么呢？网上也没找到原因。FirstFrame.setVisible(true);FirstFrame.addWindowListener(new MyWindowAdapter ());}}class MyWindowAdapter extends WindowAdapter{public void windowClosing(WindowEvent we){System.exit(0);}}