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抽象工程模式在迭代器中的应用
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‎src/com/anxpp/designpattern/abstractfactory/iterator/IIterator.java‎

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package com.anxpp.designpattern.abstractfactory.iterator;
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//抽象产品
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public interface IIterator<T> {
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boolean hasNext();
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Object next();
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}

‎src/com/anxpp/designpattern/abstractfactory/iterator/IIteratorFactory.java‎

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package com.anxpp.designpattern.abstractfactory.iterator;
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import java.util.Collection;
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import java.util.Map;
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//抽象工厂
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public interface IIteratorFactory<T> {
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IIterator<T> iteratorMap(Map<T,Object> m);
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IIterator<T> iteratorCollection(Collection<T> c);
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}

‎src/com/anxpp/designpattern/abstractfactory/iterator/IteratorCollection.java‎

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package com.anxpp.designpattern.abstractfactory.iterator;
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import java.util.Collection;
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import java.util.Iterator;
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//具体产品，Collection迭代器(用到了代理模式)
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public class IteratorCollection<T> implements IIterator<T>{
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Iterator<T> iterator;
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public IteratorCollection(Collection<T> c){
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iterator = c.iterator();
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}
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@Override
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public boolean hasNext() {
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return iterator.hasNext();
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}
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@Override
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public T next() {
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return iterator.next();
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}
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}

‎src/com/anxpp/designpattern/abstractfactory/iterator/IteratorFactory.java‎

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package com.anxpp.designpattern.abstractfactory.iterator;
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import java.util.Collection;
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import java.util.Map;
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//具体工厂
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public class IteratorFactory<T> implements IIteratorFactory<T>{
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@Override
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public IteratorMap<T> iteratorMap(Map<T,Object> m) {
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return new IteratorMap<T>(m);
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}
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@Override
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public IteratorCollection<T> iteratorCollection(Collection<T> c) {
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return new IteratorCollection<T>(c);
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}
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}

‎src/com/anxpp/designpattern/abstractfactory/iterator/IteratorMap.java‎

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package com.anxpp.designpattern.abstractfactory.iterator;
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import java.util.Iterator;
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import java.util.Map;
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//具体产品，Map迭代器(用到了代理模式)
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public class IteratorMap<T> implements IIterator<T>{
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Iterator<Map.Entry<T, Object>> iterator;
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public IteratorMap(Map<T,Object> m){
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iterator = m.entrySet().iterator();
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}
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@Override
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public boolean hasNext() {
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return iterator.hasNext();
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}
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@Override
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public Object next() {
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return iterator.next().getValue();
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}
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}

‎src/com/anxpp/designpattern/abstractfactory/iterator/TestUse.java‎

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package com.anxpp.designpattern.abstractfactory.iterator;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.LinkedHashMap;
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import java.util.Map;
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//测试使用
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public class TestUse {
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public static void main(String args[]){
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IIteratorFactory<Integer> factory = new IteratorFactory<>();
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Collection<Integer> collection = new ArrayList<Integer>();
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Map<Integer, Object> map = new LinkedHashMap<>();
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for(int i=0;i<10;i++){
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collection.add(i);
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map.put(i, i);
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}
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IIterator<Integer> iteratorCollection = factory.iteratorCollection(collection);
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IIterator<Integer> iteratorMap = factory.iteratorMap(map);
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while(iteratorCollection.hasNext())
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System.out.print(iteratorCollection.next());
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System.out.println();
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while(iteratorMap.hasNext())
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System.out.print(iteratorMap.next());
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}
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}

‎src/com/anxpp/designpattern/abstractfactory/iterator/package-info.java‎

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/**
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* @author http://anxpp.com
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* 抽象工厂模式实现Collection和Map的迭代器
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*/
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package com.anxpp.designpattern.abstractfactory.iterator;

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