集合的常用操作类CollectionUtils

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()));

    }
}