JAVA开发的工资发放系统

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class LaborageFrane extends JFrame{
 JTextField text2;
 JTextField text3;
 JTextField text1;
 JButton btn2;
 JButton btn1;
 JTextArea t1;
 JLabel label1,label2,label3;
 //构造函数 
 LaborageFrane(){
   createComponents();
   layoutComponents();
   registerEventHandlers();
   setTitle("工资程序");
   setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   pack();
  }
 //创建组件 
 private void createComponents(){
    label1=new JLabel("编号",JLabel.LEFT);
   label2=new JLabel("基本工资",JLabel.LEFT);
   label3=new JLabel("销售额",JLabel.LEFT);
   text1=new JTextField("001",5);
   text2=new JTextField("0.0",5);
   text3=new JTextField("0.0",5);
   t1=new JTextArea(3,5);
   
   
   }
 //布局 
 private void layoutComponents() {
    Container contentPane=this.getContentPane();
   contentPane.setLayout(new GridLayout(1,2));
   JPanel jp1=new JPanel();
   jp1.setLayout(new GridLayout(2,1));
   contentPane.add(jp1);
   contentPane.add(t1);
   JPanel jp2=new JPanel();
   jp2.setLayout(new GridLayout(3,2));
   jp1.add(jp2);
   JPanel jp4=new JPanel();
   jp4.setLayout(new GridLayout(3,1));
   jp1.add(jp4);
   JPanel jp3=new JPanel();
   jp3.setLayout(new BorderLayout());
   jp4.add(jp3);
   jp2.add(label1);
   jp2.add(text1);
   jp2.add(label2);
   jp2.add(text2);
   jp2.add(label3);
   jp2.add(text3);
   btn1=new JButton("确定");
   btn2=new JButton("清除");
   jp3.add(btn1,BorderLayout.WEST);
   jp3.add(btn2,BorderLayout.EAST);
   }
 //为按钮注册事件 
 private void registerEventHandlers(){
   btnShowActionEventHander showHander=new btnShowActionEventHander();
   btn1.addActionListener(showHander);
   btnClearActionEventHander clearHander=new btnClearActionEventHander();
   
   btn2.addActionListener(clearHander);
  }
 //确定按钮事件
 private class btnShowActionEventHander implements ActionListener{
   String id;
   double monthSalary;
   double commission;
   double salary;
   String out=new String();
   public void actionPerformed(ActionEvent e){
    monthSalary=Double.parseDouble(text2.getText());
    commission=Double.parseDouble(text3.getText());
    id=text1.getText();
    if(commission>=30.0&&commission<=299.99)
     salary=commission*0.05+monthSalary;
    else if(commission>=300.0&&commission<=999.99)
     salary=commission*0.1+monthSalary;
    else if(commission>=1000.0)
     salary=commission*0.15+monthSalary;
    else
     salary=monthSalary;
    out="编号: "+id+"\n"
     +"基本工资："+monthSalary+"\n"
     +"销售额："+commission+"\n"
     +"工资："+salary+"\n";
    t1.setText(out);
   }
  }
 //清除按钮事件
 private class btnClearActionEventHander implements ActionListener{
   public void actionPerformed(ActionEvent e){
    text1.setText("");
    text2.setText("");
    text3.setText("");
    t1.setText("");
   }
  }
   public static void main(String[] args){
    JFrame.setDefaultLookAndFeelDecorated(true);
    LaborageFrane laboragefrane=new LaborageFrane();
     laboragefrane.setVisible(true);
   }
}