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This article mainly shows you the "sample code of java_util_test", which is easy to understand and clear. I hope it can help you solve your doubts. Let the editor lead you to study and study the "sample code of java_util_test".

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 (iTunes 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 () }} above is all the content of this article "sample Code of java_util_test". Thank you for reading it! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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