java计算器源代码求用java编写的计算器代码？

求用java编写的计算器代码？

import java.applet.Applet; import java.awt.*; import java.awt.event.*; public class jisuan extends Applet implements ActionListener { public int c=0; public int a=0; public int w=0; Button b[]; String names[]={"0","1","2","3","4","5","6","7","8","9",".","+","-","*","/","=","clear"}; TextField text1; public void init() { text1=new TextField(); text1.addActionListener(this); add(text1); setLayout(new GridLayout(5,3,5,5)); b=new Button[names.length]; for(int i=0;i<names.length;i++) { b[i]=new Button(names[i]); b[i].addActionListener(this); add(b[i]); } } //显示计算器上最基本的按钮 public void actionPerformed(ActionEvent e) { for(int i=0;i<b.length;i++) if(e.getSource()==b[i]) { if(i<=9) { text1.setText(text1.getText()+Integer.toString(i)); a=Integer.parseInt(text1.getText()); //保存第一次输入的数值 } else if(i==10) text1.setText(text1.getText()+"."); else if(i==11) { c=11; //判断是否是加号 w=a; text1.setText(" "); } else if(i==15) { if(c==11) w=0; } } else if(i==16) text1.setText(" "); validate(); } } }