java_util_test.txt

有.NET 和 JAVA 的一些面试题目

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(); 
} 
}