16-5：集合，Collection

package cn.itcast.p3.collection.demo;import java.util.ArrayList;import java.util.Collection;public class CollectionDemo {/** * @param args */public static void main(String[] args) {Collection coll = new ArrayList();//show(coll);Collection c1 = new ArrayList();Collection c2 = new ArrayList();show(c1,c2);}public static void show(Collection c1,Collection c2){//��c1���Ԫ�ء�c1.add("abc1");c1.add("abc2");c1.add("abc3");c1.add("abc4");//��c2���Ԫ�ء�c2.add("abc1");c2.add("abc2");c2.add("abc3");c2.add("abc4");c2.add("abc5");System.out.println("c1:"+c1);System.out.println("c2:"+c2);//��ʾaddAll//c1.addAll(c2);//��c2�е�Ԫ����ӵ�c1�С�//��ʾremoveAll//boolean b = c1.removeAll(c2);//�����������е���ͬԪ�شӵ���removeAll�ļ�����ɾ��//System.out.println("removeAll:"+b);//��ʾcontainsAll//boolean b = c1.containsAll(c2);//System.out.println("containsAll:"+b);//��ʾretainAllboolean b = c1.retainAll(c2);//ȡ������������ָ���ļ�����ͬ��Ԫ�أ���ɾ��ͬ��Ԫ�ء�//��removeAll�����෴ ��System.out.println("retainAll:"+b);System.out.println("c1:"+c1);}public static void show(Collection coll){//1,���Ԫ�ء�add.coll.add("abc1");coll.add("abc2");coll.add("abc3");System.out.println(coll);//2��ɾ��Ԫ�ء�remove//coll.remove("abc2");//��ı伯�ϵij��� //��ռ���.//coll.clear();System.out.println(coll.contains("abc3"));System.out.println(coll);}}