example13_3.java

不错的教程 适合中高级人员的使用

import java.util.*;import java.awt.event.*;import java.awt.*;
import javax.swing.*;import java.io.*;
class 商品 extends Panel
{String 代号,名称;int 库存;float 单价;
  商品(String 代号,String 名称,int 库存,float 单价)
  {this.代号=代号;this.名称=名称;this.库存=库存;this.单价=单价;
  }
}

class ShowWin extends JFrame implements ActionListener
{  LinkedList goods_list=null;
  JTextField 代号文本框=new JTextField(),
名称文本框=new JTextField(),
            库存文本框=new JTextField(),
单价文本框=new JTextField(),
            删除文本框=new JTextField();
 JButton b_add=new JButton("添加商品"),
b_del=new JButton("删除商品"),b_show =new JButton("显示商品清单");
JTextArea 显示区=new JTextArea();
  ShowWin()
  {goods_list=new LinkedList();
   Container con=getContentPane(); 
   JScrollPane pane=new JScrollPane(显示区); 
显示区.setEditable(false);
   JPanel save=new JPanel();save.setLayout(new GridLayout(5,2));
   save.add(new Label("输入代号:"));save.add(代号文本框);
   save.add(new Label("输入名称:"));save.add(名称文本框);
   save.add(new Label("输入库存:"));save.add(库存文本框);
   save.add(new Label("输入单价:"));save.add(单价文本框);
   save.add(new Label("点击添加:"));save.add(b_add);
   JPanel del=new JPanel();del.setLayout(new GridLayout(2,2));
   del.add(new Label("输入删除的代号:"));del.add(删除文本框);
   del.add(new Label("点击删除:"));del.add(b_del);
   JPanel show=new JPanel();show.setLayout(new BorderLayout());
   show.add(pane,BorderLayout.CENTER);show.add(b_show,BorderLayout.SOUTH);
   JSplitPane split_one,split_two;
   split_one=new JSplitPane(JSplitPane.VERTICAL_SPLIT,save,del);
   split_two=new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,true,split_one,show);
   con.add(split_two,BorderLayout.CENTER);
   b_add.addActionListener(this);b_del.addActionListener(this);
   b_show.addActionListener(this);
  }
 public void actionPerformed(ActionEvent e)
 {if(e.getSource()==b_add)
  {String daihao=null,mingcheng=null;int kucun=0;float danjia=0.0f;
   daihao=代号文本框.getText();mingcheng=名称文本框.getText();
   kucun=Integer.parseInt(库存文本框.getText());
   danjia=Float.valueOf(单价文本框.getText()).floatValue();
   商品 goods=new 商品(daihao,mingcheng,kucun,danjia);
   goods_list.add(goods);
   try {FileOutputStream file=new FileOutputStream("goods.txt");
        ObjectOutputStream out=new  ObjectOutputStream(file);
        out.writeObject(goods_list);out.close();
       }
   catch(IOException event){}
  }
  else if(e.getSource()==b_del)
  {String daihao=删除文本框.getText();
   try {FileInputStream come_in=new FileInputStream("goods.txt");
        ObjectInputStream in=new  ObjectInputStream(come_in);
        goods_list=(LinkedList)in.readObject();in.close();
       }
   catch(ClassNotFoundException event){}
   catch(IOException event){}
   for(int i=0;i<goods_list.size();i++)
    {商品 temp=(商品)goods_list.get(i);
      if(temp.代号.equals(daihao)) {goods_list.remove(i);}
      try  {FileOutputStream file=new FileOutputStream("goods.txt");
            ObjectOutputStream out=new  ObjectOutputStream(file);
             out.writeObject(goods_list);
             out.close();
           }
       catch(IOException event){}
      }
  }
 else if(e.getSource()==b_show)
  { 显示区.setText(null);
    try {FileInputStream come_in=new FileInputStream("goods.txt");
        ObjectInputStream in=new  ObjectInputStream(come_in);
        goods_list=(LinkedList)in.readObject();
       }
   catch(ClassNotFoundException event){}
   catch(IOException event){}
   Iterator iter=goods_list.iterator();
   while(iter.hasNext())
    {  商品 te=(商品)iter.next();
       显示区.append("商品代号:"+te.代号+"     ");
       显示区.append("商品名称:"+te.名称+"     ");
       显示区.append("商品库存:"+te.库存+"     ");
       显示区.append("商品单价:"+te.单价+"     ");
       显示区.append("\n");
    }
  }
 }
} 
public class Example13_3
{public  static void main(String args[])
 { ShowWin win=new ShowWin();
   win.setSize(400,400);
   win.setVisible(true);
   win.addWindowListener(new WindowAdapter()
      {public void windowClosing(WindowEvent e)
        {System.exit(0);}});
 }
}