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);
			}
			
			
			
			

	
}