The iterator pattern for Java design Patterns

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 ("Li Yang");        List.add ("Wang Tao");                List.add ("Zhang Sa");        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 to New Iteratorimpl (this); }}

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

The iterator pattern for Java design Patterns