import javax.swing.*;
import java.awt.BorderLayout;
import java.awt.GridLayout;
public class Ckou {
JFrame f;
JPanel p;
JTextField t;
GridLayout g1;
JButton a[]=new JButton[16];
public Ckou(){
        f= new JFrame("计算器");
        g1= new GridLayout(4,4);
        p= new JPanel();
        p.setLayout(g1);
        t = new JTextField();
        a[0]=new JButton("7");a[8]=new JButton("1");
        a[1]=new JButton("8");a[9]=new JButton("2");
        a[2]=new JButton("9");a[10]=new JButton("3");
        a[3]=new JButton("/");a[11]=new JButton("-");
        a[4]=new JButton("4");a[12]=new JButton("0");
        a[5]=new JButton("5");a[13]=new JButton(".");
        a[6]=new JButton("6");a[14]=new JButton("=");
        a[7]=new JButton("*");a[15]=new JButton("+");
        f.add(t,BorderLayout.NORTH);
        f.add(p,BorderLayout.CENTER);
        for(int i=0;i<16;i++){
            p.add(a[i]);
        }
        f.setSize(400,300);
        f.setVisible(true);
    }
    public static void main(String[] args) {
        new Ckou();
    }

}