a7342068的部落格

import java.awt.*;
import java.awt.event.*;

import javax.swing.*;

public class Calculator extends JFrame implements ActionListener{

public static void main(String[]args){

new Calculator();
}

public Calculator()
{
String s;
JFrame window=new JFrame("Calculator");

window.setDefaultLookAndFeelDecorated(true);

window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

window.setLayout(new GridLayout(3,3));

JPanel jplPanel = new JPanel();
jplPanel.setLayout(new GridLayout(3,3));

JButton button[]=new JButton[10];
//s=Integer.toString(1);
s=String.valueOf(1);
//System.out.println(s);
//s="1";

for (int i = 1; i <= 9; i++)
{
button[i] = new JButton();

button[i].setActionCommand(s);
button[i].addActionListener(this);
button[i].setSize(50,50);
button[i].setText(Integer.toString(i));

jplPanel.add(button[i]);
}
window.getContentPane().add(jplPanel, BorderLayout.CENTER);
window.setSize(500,500);
window.setVisible(true);
}

public void actionPerformed(ActionEvent e) {
String cmd = e.getActionCommand();
System.out.println(cmd);
if (cmd == "1") {

System.out.println("Yes....");
}
}

}