计算器小程序代码求修改帮助~

import java.awt.event.*;
import java.applet.Applet;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class dzy extends Applet implements ActionListener{
   
    private JPanel jp = new JPanel();
    private JLabel[] jlArray = { new JLabel("有理数的第一个操作："), new JLabel("有理数的第一个操作:"),
            new JLabel("输出："), new JLabel("/"),new JLabel("/"),new JLabel("/")};
JButton[] jbArray = { new JButton("+"), new JButton("-"),new JButton("*"),new JButton("+"),new JButton("清空") };     

JTextField[] jtxtName ={ new JTextField(),new JTextField(),new JTextField(),new JTextField(),new JTextField(),new JTextField()};


public dzy(){
        jp.setLayout(null);
        for (int i=0;i<5; i++) {
        jp.add(jbArray[i]);
        jbArray[i].setBounds(50 + i+100, 130, 80, 26);
   
        jbArray[i].addActionListener(this);}
        
        for (int a=0;a<5; a++) {
        jp.add(jtxtName[a]);
        jtxtName[a].setBounds(80, 20+a, 180, 30);
        jtxtName[a].addActionListener(this);}
        
        for (int b=0;b<5; b++) {   
        jlArray[b].setBounds(30, 20 + b+50, 80, 26);
        jp.add(jlArray[b]);}
}
   
    public void actionPerformed(ActionEvent e){
   
        
        if(e.getSource()==jbArray[0]){
        int a=Integer.parseInt(jtxtName[0].getText())*Integer.parseInt(jtxtName[3].getText())+Integer.parseInt(jtxtName[1].getText())*Integer.parseInt(jtxtName[2].getText());
        jtxtName[4].setText(Integer.toString(a));
        int b=Integer.parseInt(jtxtName[1].getText())*Integer.parseInt(jtxtName[3].getText());
        jtxtName[5].setText(Integer.toString(b));
        }else if(e.getSource()==jbArray[1]){
        int c=Integer.parseInt(jtxtName[0].getText())*Integer.parseInt(jtxtName[3].getText())-Integer.parseInt(jtxtName[1].getText())*Integer.parseInt(jtxtName[2].getText());
        jtxtName[4].setText(Integer.toString(c));
        int d=Integer.parseInt(jtxtName[1].getText())*Integer.parseInt(jtxtName[3].getText());
        jtxtName[5].setText(Integer.toString(d));
        }else if(e.getSource()==jbArray[3]){
        int f=Integer.parseInt(jtxtName[0].getText())*Integer.parseInt(jtxtName[2].getText());
        jtxtName[4].setText(Integer.toString(f));
        int g=Integer.parseInt(jtxtName[1].getText())*Integer.parseInt(jtxtName[3].getText());
        jtxtName[5].setText(Integer.toString(g));
        }else if(e.getSource()==jbArray[3]){
        int w=Integer.parseInt(jtxtName[0].getText())*Integer.parseInt(jtxtName[3].getText());
        jtxtName[4].setText(Integer.toString(w));
        int z=Integer.parseInt(jtxtName[1].getText())*Integer.parseInt(jtxtName[2].getText());
        jtxtName[5].setText(Integer.toString(z));
        }else{
        jtxtName[0].setText("0");
        jtxtName[1].setText("0");
        jtxtName[2].setText("0");
        jtxtName[3].setText("0");
        jtxtName[4].setText("0");
        jtxtName[5].setText("0");
    }
    }   
}   


希望大家可以帮帮忙，帮我看看是哪错了~最好能详细的指出来~~

[ 本帖最后由 绣球毛毛 于 2011-6-8 11:46 编辑 ]
----------------解决方案--------------------------------------------------------
一个计算器有这么复杂吗？

----------------解决方案--------------------------------------------------------