设计模式_门面模式

public interface ILetterProcess {
 public void writerContext(String context);
 public void fillEnvelope(String address);
 public void letterIntoEnvelope();
 public void sendLetter();
}

public class LetterProcess implements ILetterProcess {
 public void fillEnvelope(String address) {
  System.out.println("填写信的地址:"+address);
 }
 public void letterIntoEnvelope() {
  System.out.println("把信放进信封");
 }
 public void sendLetter() {
  System.out.println("邮递信件");
 }
 public void writerContext(String context) {
  System.out.println("写信内容:"+context);
 }
}

public class ModenPostOffice {
 private ILetterProcess letterProcess=new LetterProcess();
 
 public void sendLetter(String context,String address){
  this.letterProcess.writerContext(context);
  this.letterProcess.fillEnvelope(address);
  this.letterProcess.letterIntoEnvelope();
  this.letterProcess.sendLetter();
 }
}

public class Client {
 
 public static void main(String[] args) {
  ModenPostOffice postOffice=new ModenPostOffice();
  postOffice.sendLetter("你被录取了", "XX大学");
 }
}

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