一个applet 加法计算器

longren629

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));
}
}