CollectionUtils 操作集

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);

// 交集的補集

Collection<String> disjunctionList = CollectionUtils.disjunction(aList, bList);

// 集合相減

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);

// 測試

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()));

}

}