设计模式之责任链

1类图

2java示例

public class Test {

  public static void main(String[] args) {
    Processor word=new WordProcessor();
    Processor syntax=new SyntaxProcessor();
    Processor compile=new CompileProcessor();
    word.setNext(syntax);
    syntax.setNext(compile);
    word.handle();
  }

}

public interface Processor {
  void setNext(Processor p);
  void handle();
}

public class WordProcessor implements Processor {
  private Processor next;
  @Override
  public void setNext(Processor p) {
    this.next=p;
  }

  @Override
  public void handle() {
    System.out.println("word process");
    if(this.next!=null){
      this.next.handle();
    }
  }

}

public class SyntaxProcessor implements Processor {
  private Processor next;
  @Override
  public void setNext(Processor p) {
    this.next=p;
  }

  @Override
  public void handle() {
    System.out.println("syntax process");
    if(this.next!=null){
      this.next.handle();
    }
  }
}

public class CompileProcessor implements Processor {
  private Processor next;
  @Override
  public void setNext(Processor p) {
    this.next=p;
  }

  @Override
  public void handle() {
    System.out.println("compile process");
    if(this.next!=null){
      this.next.handle();
    }
  }

}