java编的简单计算器

一个java编译的最简单的计算器 import java.awt.*; import java.awt.event.*; import javax.swing.*; public class jisuan extends JFrame implements ActionListener{ /** * */ private static final long serialVersionUID = 5823423246304135749L; JPanel cp=new JPanel(); JPanel cp1=new JPanel(); Double nu1,nu2;