market.java

Java 版本的设计模式源代码 简单工厂模式

package outLook;
import outLook.*;
import source.*;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class market extends JFrame implements ActionListener,ItemListener
{
	private JTextField priceT,ammountT;
	private JButton confirmB,cancelB;
	private JTextArea showInf;
	private JLabel priceL,ammountL,total1L,total2L,payL;
	private static double price=0,total=0,rebateRate=1,payOriginal=0,payBack=0;
	private static int ammount=0,flag=0,select=0;
	private JComboBox payC;
	public market()
	{
		super("模拟收银系统");
		this.setSize(270,600);
		this.setLocation(450,80);
		this.setDefaultCloseOperation(EXIT_ON_CLOSE);
		
		showInf=new JTextArea("");
		priceL=new JLabel("商品单价:");
		ammountL=new JLabel("商品数量:");
		payL=new JLabel("收款方式:");
		total1L=new JLabel ("总计：");
		total2L=new JLabel ("尚未统计");
		
		priceT=new JTextField("",4);
		ammountT=new JTextField("",4);
		
		confirmB=new JButton("确  定");
		cancelB=new JButton("重  置");
		confirmB.addActionListener(this);
		cancelB.addActionListener(this);
		
		Object strategy[]={"正常收款","打9折收款","打8折收款","打7折收款",
				"满700返300","满500返200","满300返100"};
		
		payC=new JComboBox(strategy);
		
		JPanel panel=new JPanel(new BorderLayout());
		JPanel panel1=new JPanel(new GridLayout(5,2));
		JPanel panel2=new JPanel(new GridLayout(2,2));
		
		panel1.add(ammountL);
		panel1.add(ammountT);
		panel1.add(priceL);
		panel1.add(priceT);
		panel1.add(payL);
		panel1.add(payC);
		panel1.add(confirmB);
		panel1.add(cancelB);
		
		panel2.add(total1L);
		panel2.add(total2L);
		
		JScrollPane jScrollPane = new JScrollPane(showInf,
				JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
				JScrollPane.HORIZONTAL_SCROLLBAR_NEVER); 
		//jScrollPane1.getViewport().add(panel, null); 
		
		panel.add(panel1,"North");
		panel.add(jScrollPane,"Center");
		panel.add(panel2,"South");
		this.add(panel);
		this.setVisible(true);
	}
	public void actionPerformed(ActionEvent e)
	{
		if(e.getSource()==confirmB)
		{
			select=payC.getSelectedIndex();
			try
			{
				price=Double.parseDouble(priceT.getText());
				if(price<=0)
				{
					JOptionPane.showMessageDialog(null,"商品价格必须大于零","Error",JOptionPane.ERROR_MESSAGE);
					return;
					}
				}
			catch (Exception e1)
			{
				JOptionPane.showMessageDialog(null,"商品价格输入有误","Error",JOptionPane.ERROR_MESSAGE);
				return;
			}
			try
			{
				ammount=Integer.parseInt(ammountT.getText());
				//String server=JOptionPane.showInputDialog("输入服务器IP");
				//JOptionPane.showConfirmDialog(null,"找到了","Warning",JOptionPane.DEFAULT_OPTION,JOptionPane.WARNING_MESSAGE,null);
				if(ammount<=0)
				{
					JOptionPane.showMessageDialog(null,"商品数量必须大于零") ;return;
					}
				}
			catch (Exception e1)
			{
				JOptionPane.showMessageDialog(null,"商品数量输入有误","Error",JOptionPane.ERROR_MESSAGE);
				return;
			}	
			showInf.append("原收:"+ammount*price+"  ");
			buy(select);
			showInf.append("  收费方式:"+(String)(payC.getSelectedItem())+"\n");
			showInf.append("***********************************************\n");
			total2L.setText(""+total);
			//JOptionPane.showMessageDialog(null,null,""+total,JOptionPane.PLAIN_MESSAGE) ;
		}
		if(e.getSource()==cancelB)
		{
			priceT.setText("");
			ammountT.setText("");
			payC.setSelectedIndex(0);
		}
	}
	public void itemStateChanged(ItemEvent e)
	{
		
	}
	public void buy(int select)
	{
		switch(select)
		{
		case 0:;break;
		case 1:rebateRate=0.9;flag=1;break;
		case 2:rebateRate=0.8;flag=1;break;
		case 3:rebateRate=0.7;flag=1;break;
		case 4:;payOriginal=700;payBack=300;flag=2;break;
		case 5:;payOriginal=500;payBack=200;flag=2;break;
		case 6:;payOriginal=300;payBack=100;flag=2;break;
		
		}
		context contextIns=new context(flag,price,ammount,rebateRate,payOriginal,payBack);
		String temp=contextIns.getPay();
		total+=Double.parseDouble(temp);
		showInf.append("实收："+contextIns.getPay()+"\n");
	}

}