java_util_test的示例代码

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package com.diegoyun.apiLearning;import java.util.*;/*** User: diegoyun* Date: 2005-1-30* Time: 19:03:29*/public final class UtilTutorial{public static void collectionRetainTest(){System.out.println("**********collectionRetainTest begin:");Collection c1 = new ArrayList();Collection c2 = new ArrayList();c1.add("aaa");c1.add("bbb");c1.add("ccc");c2.add("ddd");c2.add("ccc");c2.add("eee");boolean isRetainSucceed = false;isRetainSucceed = c2.retainAll(c1);System.out.println("isRetainSucceed = " + isRetainSucceed);System.out.println("********** Print collection c2 values ");for (Iterator iter = c2.iterator(); iter.hasNext();){String s = (String) iter.next();System.out.println("element = " + s);}System.out.println("**********collectionRetainTest end:");}public static void listIteratorTest(){System.out.println("**********listIteratorTest begin:");List list = new ArrayList();list.add("aaa");list.add("bbb");list.add("ccc");ListIterator iter = list.listIterator();System.out.println("**************** Iterating List forward :");while(iter.hasNext()){String s = (String)iter.next();System.out.println("**********element = " + s);}System.out.println("**************** Iterating List backward :");while(iter.hasPrevious()){String s = (String)iter.previous();System.out.println("**********element = " + s);}System.out.println("**************** Add element into List :");while(iter.hasNext()){int i = iter.nextIndex();if (i==2)iter.add("ddd");String s = (String)iter.next();System.out.println("**********element = " + s);}System.out.println("**************** Iterating List backward after add element:");while(iter.hasPrevious()){String s = (String)iter.previous();System.out.println("**********element = " + s);}System.out.println("**********listIteratorTest end:");}public static void main(String[]args){// UtilTutorial.collectionRetainTest();UtilTutorial.listIteratorTest();}}

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