strategy模式实例

package view; import java.awt.Container; import java.awt.Dimension; import java.awt.FlowLayout; import java.awt.GridLayout; import java.awt.Toolkit; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JComboBox; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import com.Printer; import Strategy.strategy1; import Strategy.strategy2; import Strategy.strategy3; import Strategy.strategys; public class view extends JFrame implements ActionListener{ JComboBox brand=new JComboBox(); @SuppressWarnings("rawtypes") JComboBox strategys=new JComboBox(); JLabel JL=new JLabel(); Printer[] printer = new Printer[4];//品牌=========== public static void main(String[] args){ view view= new view("折后价格计算"); view.setVisible(true); } public view(String title){ super(title); Container c1=getContentPane();// c1.setLayout(new GridLayout(3,2)); c1.add(new JLabel("品牌：")); c1.add(brand); c1.add(new JLabel("折扣策略:")); c1.add(strategys); JButton btn= new JButton("计算折扣后价格"); btn.addActionListener(this); c1.add(btn); c1.add(JL); InitFonts(); setSize(300,120); setResizable(false); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); centerWindows(); } public void actionPerformed(ActionEvent e){ Printer nowPr=printer[brand.getSelectedIndex()]; nowPr.setStrategys(null); int index=strategys.getSelectedIndex(); if(index==0){ nowPr.setStrategys(new strategy1()); }else if(index==1){ nowPr.setStrategys(new strategy2()); }else{ nowPr.setStrategys(new strategy3()); } JL.setText("折后价格:"+nowPr.seeDiscount(nowPr.price)+"元"); } private void InitFonts() { // TODO Auto-generated method stub printer[0]=new Printer("惠普H",849.00); printer[1]=new Printer("惠普L",499.00); printer[2]=new Printer("爱普生",1569.00); printer[3]=new Printer("佳能",229.00); for(int i=0; i<printer.length;i++){ brand.addItem(printer[i].name); } String strategy[]={"打折方案一","打折方案二","打折方案三"};//打折方案============== for(int j=0;j<strategy.length;j++){ strategys.addItem(strategy[j]); } } private void centerWindows() { // TODO Auto-generated method stub Toolkit tk=getToolkit(); Dimension dm= tk.getScreenSize(); setLocation((int)(dm.getWidth()-getWidth())/2,(int)(dm.getHeight()-getHeight())/2); } }