2018.3.25 设计模式之简单工厂方法例子（汽车保险）

先定义 汽车保险接口 AutoInsurance

package com.glut.demo;

/**
 * 汽车保险
 * 接口
 * @author qichunlin
 *
 */
public interface AutoInsurance {
	abstract String getInfo();
}

定义具体类型去实现汽车保险的接口

package com.glut.demo;

/**
 * 
 * 车身喷油嘴
 * 实现类
 * @author qichunlin
 *
 */
public class BodyInjur implements AutoInsurance{
	
	private String description;//说明
	
	@Override
	public String getInfo() {
		description = " Body Injur Liability: 

Bodily injury coverage pays for medical bills" +
                " lost wages, rehabilitation, treatment and/or" +
                " funeral costs for anyone injured or killed " +
                " by your car. Such coverage will also pay for" +
                " pain and suffering damages when a third " +
                " party successfully sues. ";
		return description;//注意这里返回的是一个对象
	}
	
}

再定义另外一个工厂接口 PolicyProducer

package com.glut.demo;

/**
 * This is a sub class in the factory class hierarchy PolicyProducer
 * 
 * 实现接口PolicyProducer  的类
 * 
 * @author qichunlin
 *
 */
public class BodyPolicy implements PolicyProducer{

	@Override
	public AutoInsurance getInsurObj() {
		return new BodyInjur();
	}

}

package com.glut.demo;

public class LuxuryCarPolicy implements PolicyProducer{

	@Override
	public AutoInsurance getInsurObj() {
		return new LuxuryCarInjur();
	}

}

测试类 客户端的GUI ，用户选择相应的保险显示在屏幕上

package com.glut.demo;

/**
 * 
 * This is a client class that 
 * uses the factory method pattern
 * @author qichunlin
 *
 */

import java.awt.event.*;
import java.awt.*;
import java.net.*;
import javax.swing.*;
import javax.swing.BorderFactory;
import javax.swing.border.Border;
import java.io.File;
import java.io.IOException;



public class ClientGUI extends JFrame {
	
	  private JSplitPane  bigSplitPane;
	  private JScrollPane showInfoPane;
	  private JPanel btnPanel;
	  private JComboBox cmbInsuranceType, cmbHouseType;
	  private JLabel lblInsureType;
	  private Dimension   minimumSize;
	  private JTextArea txtForInfo;

	  public static final String SHOW = "Show Info";
	  public static final String EXIT = "Exit";
	  public static final String BODYINJURE = "Body Injur Liability";
	  public static final String COLLISION = "Collision Coverage";
	  public static final String PERSONINJURE = "Personal Injury Protection";
	  public static final String PROPERTY = "Property Damage Liability";
	  public static final String COMPREHENSIVE = "Comprehensive Coverage";
	  public static final String LuxuryCarInjur="LuxuryCarInjur";

	  public ClientGUI() {
	     super("Factory Method Pattern- Auto Insurance. ");
	     minimumSize = new Dimension(130, 100);
	     setUpChoicePanel();
	     setUpScrollPanes();
	   }

	  private void setUpChoicePanel() {
		  
	      cmbInsuranceType = new JComboBox();
		  cmbInsuranceType.addItem(BODYINJURE);
		  cmbInsuranceType.addItem(COLLISION);
		  cmbInsuranceType.addItem(PERSONINJURE);
		  cmbInsuranceType.addItem(PROPERTY);
		  cmbInsuranceType.addItem(COMPREHENSIVE);
		  cmbInsuranceType.addItem(LuxuryCarInjur);

		  lblInsureType = new JLabel("Insurance Types");

	  //Create the open button
	  JButton openButton = new JButton(SHOW);
	  openButton.setMnemonic(KeyEvent.VK_S);
	  JButton exitButton = new JButton(EXIT);
	  exitButton.setMnemonic(KeyEvent.VK_X);

	  ButtonListener btnListener = new ButtonListener();

	  // add action Listener
	  openButton.addActionListener(btnListener);
	  exitButton.addActionListener(btnListener);

	  btnPanel = new JPanel();

	  //------------------------------------------------
	  GridBagLayout gridbag = new GridBagLayout();
	  btnPanel.setLayout(gridbag);
	  GridBagConstraints gbc = new GridBagConstraints();

	  btnPanel.add(lblInsureType);
	  btnPanel.add(cmbInsuranceType);
	  btnPanel.add(openButton);
	  btnPanel.add(exitButton);

      gbc.insets.top = 5;
      gbc.insets.bottom = 5;
      gbc.insets.left = 5;
      gbc.insets.right = 5;

      gbc.gridx = 0;
      gbc.gridy = 0;
      gridbag.setConstraints(lblInsureType, gbc);
      gbc.gridx = 1;
      gbc.gridy = 0;
      gridbag.setConstraints(cmbInsuranceType, gbc);

      gbc.insets.left = 2;
      gbc.insets.right = 2;
      gbc.insets.top = 15;
      gbc.gridx = 0;
      gbc.gridy = 5;
      gridbag.setConstraints(openButton, gbc);
      gbc.anchor = GridBagConstraints.WEST;
      gbc.gridx = 1;
      gbc.gridy = 5;
      gridbag.setConstraints(exitButton, gbc);
      //-----------------------------------------------
   }

   private void setUpScrollPanes() {
   	  Border raisedbevel = BorderFactory.createRaisedBevelBorder();

   	  txtForInfo = new JTextArea("Auto insurance information will be shown here.", 20, 30);
   	  txtForInfo.setFont(new Font("Helvetica", Font.BOLD, 15));

  	  txtForInfo.setLineWrap(true);
  	  txtForInfo.setBackground(Color.pink);

  	  showInfoPane = new JScrollPane(txtForInfo);

  	  bigSplitPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT, showInfoPane, btnPanel);
  	  bigSplitPane.setDividerLocation(220);

      getContentPane().add(bigSplitPane);
  	  setSize(new Dimension(500, 300));
      setVisible(true);
   }

   class ButtonListener implements ActionListener {
      public void actionPerformed(ActionEvent ae) {

		if (ae.getActionCommand().equals(EXIT)) {
		    System.exit(1);
		}

		if (ae.getActionCommand().equals(SHOW)) {

		    String type = (String) cmbInsuranceType.getSelectedItem();
		    PolicyProducer pp=null;

		    if (type.equals(BODYINJURE)) {
				pp=new BodyPolicy();
		    }
		    else if (type.equals(COLLISION)) {
		        pp=new CollPolicy();
		    }
		    else if (type.equals(PERSONINJURE)) {
				pp= new PersonPolicy();
		    }
		    else if (type.equals(PROPERTY)) {
				pp = new PropPolicy();
			}
			else if (type.equals(COMPREHENSIVE)) {
				pp= new ComPolicy();
		    }else if(type.equals(LuxuryCarInjur)){
		    	pp =new LuxuryCarPolicy();
		    }

		    AutoInsurance ai = pp.getInsurObj();
			String desc = ai.getInfo();
			txtForInfo.setText(desc);
          }
      }
   }

   public static void main(String args[])
   {
      try {
         UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
      }
      catch (Exception evt) {}

      ClientGUI frame = new ClientGUI();
      frame.addWindowListener(new WindowAdapter() {
         public void windowClosing(WindowEvent e)
         {
            System.exit(0);
         }
      }
      );
      frame.setSize(500, 420);
      frame.setVisible(true);
   }
}