设计模式----门面模式（facade）

LetterProcess.java代码如下：

package com.designPattern.facade;

public interface LetterProcess {

	public void writeContext(String context);
	
	public void fillEnvelope(String address);
	
	public void letterIntoEnvelope();
	
	public void sendLetter();
}

LetterProcessImpl.java代码如下：

package com.designPattern.facade;

public class LetterProcessImpl implements LetterProcess{

	public void writeContext(String context) {
		System.out.println("填写信的内容："+context);		
	}

	public void fillEnvelope(String address) {
		System.out.println("填写收件人地址及姓名："+address);

	}

	public void letterIntoEnvelope() {
		System.out.println("把信放到信封中！");		
	}

	public void sendLetter() {
		System.out.println("邮递信件！");		
	}

}

ModenPostOffice.java代码如下：

package com.designPattern.facade;

/**
 * 门面模式类
 * @author yangjianzhou
 *
 */
public class ModenPostOffice {
	
	private LetterProcess letterProcess = new LetterProcessImpl();
	
	public void sendLetter(String context,String address){
		
		letterProcess.writeContext(context);
		
		letterProcess.fillEnvelope(address);
		
		letterProcess.letterIntoEnvelope();
		
		letterProcess.sendLetter();
	}

}

Client.java代码如下：

package com.designPattern.facade;

public class Client {
	
	public static void main(String[] args) {
		
		ModenPostOffice modenPostOffice = new ModenPostOffice();
		
		String context = " hello , this is my first letter to you !";
		
		String address = " shanghai songjiang ";
		
		modenPostOffice.sendLetter(context, address);
	}

}

运行结果如下：

填写信的内容： hello , this is my first letter to you !
填写收件人地址及姓名： shanghai songjiang 
把信放到信封中！
邮递信件！