Java 設計模式 之 迭代器模式

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http://www.verejava.com/?id=16999127808571

package com.iterator.theory;import java.util.Arrays;public class TestIterator{    public static void main(String[] args)    {        List list=new ArrayList();        list.add("李陽");        list.add("王濤");        list.add("張颯");                Iterator iter=list.iterator();        while(iter.hasNext())        {            Object obj=iter.next();            System.out.println(obj);        }    }}package com.iterator.theory;public interface Iterator{    public boolean hasNext();        public Object next();}package com.iterator.theory;public class IteratorImpl implements Iterator{    private int index;    private List list;        public IteratorImpl(List list)    {        this.list=list;    }    @Override    public boolean hasNext()    {        return index<list.size();    }    @Override    public Object next()    {        Object element=null;        if(index<list.size())        {            element=list.get(index);            index++;        }                return element ;    }}package com.iterator.theory;public interface List{    public void add(Object element);        public Object get(int index);        public int size();        public Iterator iterator();}package com.iterator.theory;import java.util.Arrays;public class ArrayList implements List{    private int initCapacit=20;    private int size;    private Object[] elementData;        public ArrayList()    {        elementData=new Object[initCapacit];    }    @Override    public void add(Object element)    {        if(size<initCapacit)        {            elementData[size]=element;            size++;        }        else        {            elementData=Arrays.copyOf(elementData, size);            elementData[size]=element;            size++;        }    }        @Override    public Object get(int index)    {        return elementData[index];    }    @Override    public int size()    {        return size;    }    @Override    public Iterator iterator()    {        return new IteratorImpl(this);    }}

http://www.verejava.com/?id=16999127808571

Java 設計模式 之 迭代器模式