集合的常用操作类CollectionUtils

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转：http://www.blogjava.net/jakin/archive/2009/05/14/270634.html
package com.jakin.util;import java.util.ArrayList;import java.util.Collection;import java.util.Collections;import java.util.List;import org.apache.commons.collections.CollectionUtils;import org.apache.commons.lang.ArrayUtils;public class CollectionUtilsTest {    @SuppressWarnings("unchecked")    public static void main(String[] args) {        List<String> aList = new ArrayList<String>();        aList.add("aaa");        aList.add("bbb");        aList.add("ccc");        List<String> bList = new ArrayList<String>();        bList.add("aaa");        bList.add("ddd");        bList.add("eee");        // 并集        Collection<String> unionList = CollectionUtils.union(aList, bList);        // 交集        Collection<String> intersectionList = CollectionUtils.intersection(aList, bList);        // 是否存在交集        boolean isContained = CollectionUtils.containsAny(aList, bList);        // 交集的补集        Collection<String> disjunctionList = CollectionUtils.disjunction(aList, bList);        // 集合相减        Collection<String> subtractList = CollectionUtils.subtract(aList, bList);                // 排序        Collections.sort((List<String>) unionList);        Collections.sort((List<String>) intersectionList);        Collections.sort((List<String>) disjunctionList);        Collections.sort((List<String>) subtractList);        // 测试        System.out.println("A: " + ArrayUtils.toString(aList.toArray()));        System.out.println("B: " + ArrayUtils.toString(bList.toArray()));        System.out.println("A has one of B? : " + isContained);        System.out.println("Union(A, B): "                + ArrayUtils.toString(unionList.toArray()));        System.out.println("Intersection(A, B): "                + ArrayUtils.toString(intersectionList.toArray()));        System.out.println("Disjunction(A, B): "                + ArrayUtils.toString(disjunctionList.toArray()));        System.out.println("Subtract(A, B): "                + ArrayUtils.toString(subtractList.toArray()));    }}
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