import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Add_Frame extends JFrame {
public static void main(String[] args) {
JFrame f = new JFrame("my frame");
f.setBounds(0,0,800,600);
f.setLayout(new FlowLayout());
JTextField first_tf = new JTextField(8);
JButton bt_Add = new JButton("+");
JTextField second_tf = new JTextField(8);
JButton bt_Equls = new JButton("=");
JTextField result = new JTextField(8);
f.add(first_tf);
f.add(bt_Add);
f.add(second_tf);
f.add(bt_Equls);
f.add(result);
//点击
bt_Equls.addActionListener(
new ActionListener()
{
@Override
public void actionPerformed(ActionEvent e)
{
// TODO Auto-generated method stub
double num1 = Double.parseDouble(first_tf.getText());
double num2 = Double.parseDouble(second_tf.getText());
double sum = num1+num2;
result.setText(String.valueOf(sum));
}
}
);
f.setVisible(true);
f.setDefaultCloseOperation(3);
}
}