责任链模式

anxpp · anxpp · commit 4c90cc9215dc · 2016-04-22T18:45:01.000+08:00
diff --git a/src/com/anxpp/designpattern/chainofresponsibility/Handler.java b/src/com/anxpp/designpattern/chainofresponsibility/Handler.java
@@ -0,0 +1,6 @@
+package com.anxpp.designpattern.chainofresponsibility;
+//处理者
+public interface Handler{
+	int handleRequest(int n);
+	void setNextHandler(Handler next);
+}
diff --git a/src/com/anxpp/designpattern/chainofresponsibility/Handler1.java b/src/com/anxpp/designpattern/chainofresponsibility/Handler1.java
@@ -0,0 +1,18 @@
+package com.anxpp.designpattern.chainofresponsibility;
+//第一个具体处理者，处理小于0的
+public class Handler1 implements Handler{
+	private Handler next;
+	@Override
+	public int handleRequest(int n){
+		if(n<0) return -n;
+		else{
+			if(next==null)
+				throw new NullPointerException("next 不能为空");
+			return next.handleRequest(n);
+		}
+	}
+	@Override
+	public void setNextHandler(Handler next){
+		this.next = next;
+	}
+}
diff --git a/src/com/anxpp/designpattern/chainofresponsibility/Handler2.java b/src/com/anxpp/designpattern/chainofresponsibility/Handler2.java
@@ -0,0 +1,18 @@
+package com.anxpp.designpattern.chainofresponsibility;
+//第二个具体处理者，处理>=0但小于10的
+public class Handler2 implements Handler{
+	private Handler next;
+	@Override
+	public int handleRequest(int n){
+		if(n<10) return n*n;
+		else{
+			if(next==null)
+				throw new NullPointerException("next 不能为空");
+			return next.handleRequest(n);
+		}
+	}
+	@Override
+	public void setNextHandler(Handler next){
+		this.next = next;
+	}
+}
diff --git a/src/com/anxpp/designpattern/chainofresponsibility/Handler3.java b/src/com/anxpp/designpattern/chainofresponsibility/Handler3.java
@@ -0,0 +1,18 @@
+package com.anxpp.designpattern.chainofresponsibility;
+//第三个具体处理者，处理>=0但小于10的
+public class Handler3 implements Handler{
+	private Handler next;
+	@Override
+	public int handleRequest(int n){
+		if(n<=Integer.MAX_VALUE) return n;
+		else{
+			if(next==null)
+				throw new NullPointerException("next 不能为空");
+			return next.handleRequest(n);
+		}
+	}
+	@Override
+	public void setNextHandler(Handler next){
+		this.next = next;
+	}
+}
diff --git a/src/com/anxpp/designpattern/chainofresponsibility/TestUse.java b/src/com/anxpp/designpattern/chainofresponsibility/TestUse.java
@@ -0,0 +1,14 @@
+package com.anxpp.designpattern.chainofresponsibility;
+public class TestUse{
+	public static void main(String args[]){
+		Handler h1,h2,h3;
+		h1 = new Handler1();
+		h2 = new Handler2();
+		h3 = new Handler3();
+		h1.setNextHandler(h2);
+		h2.setNextHandler(h3);
+		System.out.println(h1.handleRequest(-1));
+		System.out.println(h1.handleRequest(5));
+		System.out.println(h1.handleRequest(9999));
+	}
+}

-Original file line number
+Diff line change
@@ @@ -0,0 +1,6 @@ @@
 +packagecom.anxpp.designpattern.chainofresponsibility;
 +//处理者
 +publicinterfaceHandler{
 +inthandleRequest(intn);
 +voidsetNextHandler(Handlernext);
 +}