GUI编程 初步 AWT组件与布局管理器

```java
import java.awt.*;
public class TenButtons {
  public static void main(String args[]) {
    Frame f = new Frame("Java Frame");
    f.setLayout(new GridLayout(2,1)); 
    f.setLocation(300,400);
    f.setSize(300,200);
    f.setBackground(new Color(204,204,255));
    Panel p1 = new Panel(new BorderLayout());
    Panel p2 = new Panel(new BorderLayout());
    Panel p11 = new Panel(new GridLayout(2,1));
    Panel p21 = new Panel(new GridLayout(2,2));
    p1.add(new Button("BUTTON"),BorderLayout.WEST);
    p1.add(new Button("BUTTON"),BorderLayout.EAST);
    p11.add(new Button("BUTTON"));
    p11.add(new Button("BUTTON"));
    p1.add(p11,BorderLayout.CENTER);
    p2.add(new Button("BUTTON"),BorderLayout.WEST);
    p2.add(new Button("BUTTON"),BorderLayout.EAST);
    for(int i =1;i<=4;i++) {p21.add(new Button("BUTTON"));} 
    p2.add(p21,BorderLayout.CENTER);
    f.add(p1);f.add(p2);
    f.setVisible(true);
  }
}

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