progresssale.java

我的JAVA, 不知道好不好,希望你可以改

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class ProgressSale extends JFrame implements ActionListener
{
  JButton button1,button2,button3,button4;
  ProgressSale(String s)
  {
    super(s);
    Container con=this.getContentPane();
    FlowLayout flow=new FlowLayout();
    flow.setAlignment(FlowLayout.CENTER);
    flow.setHgap(2);
    flow.setVgap(8);
    con.setLayout(flow);
    JButton button1=new JButton("progress of 001");
    JButton button2=new JButton("progress of 002");
    JButton button3=new JButton("progress of 003");
    JButton button4=new JButton("progress of 004");
    button1.addActionListener(this);
    button2.addActionListener(this);
    button3.addActionListener(this);
    button4.addActionListener(this);
    con.add(button1);
    con.add(button2);
    con.add(button3);
    con.add(button4);
    con.validate();
    setBounds(100,100,300,300);
    setVisible(true);
    setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
  }
  public void actionPerformed(ActionEvent e)
  {
    if(e.getSource()==button1)
    {
      N001Sale n001sale=new N001Sale("001's progress sales");
    }
    else if(e.getSource()==button2)
    { 
      N002Sale n002sale=new N002Sale("002's progress sales");
    }
    else if(e.getSource()==button3)
    {
      N003Sale n003sale=new N003Sale("003's progress sales");
    }
    else if(e.getSource()==button4)
    {
      N004Sale n004sale=new N004Sale("004's progress sales");
    }
  }
}