一个applet 加法计算器

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class Appletsum extends JApplet

implements ActionListener{

JTextField inputOne=new JTextField(5);

JTextField inputTwo=new JTextField(5);

JTextField output=new JTextField(5);

public void init(){

Container pane=getContentPane();

pane.setLayout(new FlowLayout());

pane.add(new JLabel("加 数"));

pane.add(inputOne);

pane.add(new JLabel("被加数"));

pane.add(inputTwo);

pane.add(new JLabel(" 和 "));

pane.add(output);

inputTwo.addActionListener(this);

}

public void actionPerformed(ActionEvent e)

{

double first,second,sum;

first=Double.parseDouble(inputOne.getText().trim());

second=Double.parseDouble(inputTwo.getText().trim());

sum=first+second;

output.setText(String.valueOf(sum));

}

}