Layout布局管理器——计算器代码

import java.awt.*;

public class WindowDemo {
    public static void main(String[] args) {
       frame frame=new frame("计算机");
       Panel p=new Panel();
        p.add(new TextField(30));
        frame.add(p,BorderLayout.NORTH);
        Panel p2=new Panel();


        p2.setLayout(new GridLayout(3,5,4,4));


        for (int i  = 0; i < 10; i++) {
            p2.add(new Button(i+"") );
        }
        p2.add(new Button("+"));
        p2.add(new Button("-"));
        p2.add(new Button("*"));
        p2.add(new Button("/"));
        p2.add(new Button("."));
        frame.add(p2);
frame.pack();
frame.setVisible(true);







    }
}