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anxppanxpp
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5 files changed

+74
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‎src/com/anxpp/designpattern/chainofresponsibility/Handler.java‎

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package com.anxpp.designpattern.chainofresponsibility;
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//处理者
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public interface Handler {
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int handleRequest(int n);
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void setNextHandler(Handler next);
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}

‎src/com/anxpp/designpattern/chainofresponsibility/Handler1.java‎

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package com.anxpp.designpattern.chainofresponsibility;
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//第一个具体处理者，处理小于0的
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public class Handler1 implements Handler {
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private Handler next;
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@Override
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public int handleRequest(int n) {
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if(n<0) return -n;
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else{
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if(next==null)
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throw new NullPointerException("next 不能为空");
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return next.handleRequest(n);
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}
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}
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@Override
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public void setNextHandler(Handler next) {
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this.next = next;
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}
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}

‎src/com/anxpp/designpattern/chainofresponsibility/Handler2.java‎

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package com.anxpp.designpattern.chainofresponsibility;
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//第二个具体处理者，处理>=0但小于10的
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public class Handler2 implements Handler {
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private Handler next;
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@Override
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public int handleRequest(int n) {
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if(n<10) return n*n;
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else{
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if(next==null)
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throw new NullPointerException("next 不能为空");
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return next.handleRequest(n);
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}
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}
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@Override
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public void setNextHandler(Handler next) {
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this.next = next;
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}
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}

‎src/com/anxpp/designpattern/chainofresponsibility/Handler3.java‎

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package com.anxpp.designpattern.chainofresponsibility;
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//第三个具体处理者，处理>=0但小于10的
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public class Handler3 implements Handler {
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private Handler next;
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@Override
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public int handleRequest(int n) {
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if(n<=Integer.MAX_VALUE) return n;
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else{
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if(next==null)
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throw new NullPointerException("next 不能为空");
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return next.handleRequest(n);
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}
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}
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@Override
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public void setNextHandler(Handler next) {
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this.next = next;
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}
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}

‎src/com/anxpp/designpattern/chainofresponsibility/TestUse.java‎

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package com.anxpp.designpattern.chainofresponsibility;
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public class TestUse {
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public static void main(String args[]){
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Handler h1,h2,h3;
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h1 = new Handler1();
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h2 = new Handler2();
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h3 = new Handler3();
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h1.setNextHandler(h2);
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h2.setNextHandler(h3);
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System.out.println(h1.handleRequest(-1));
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System.out.println(h1.handleRequest(5));
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System.out.println(h1.handleRequest(9999));
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}
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}

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