关于集合类的操作

package com.zcl.collection;

import java.util.ArrayList;
import java.util.Collection;

public class CollectionToArray
{
    /**
     * Collection方法的测试：
     */

    public static void main(String[] args) {
        Collection collection1=new ArrayList();
        collection1.add("000");
        collection1.add("111");
        collection1.add("222");
        System.out.println("集合collection1的大小:"+collection1.size());
        System.out.println("集合collection1的内容："+collection1);
        collection1.remove("000");
        System.out.println("集合collection1移除000后的内容："+collection1);
        System.out.println("集合collection1是否包含000："+collection1.contains("000"));
        System.out.println("集合collection1是否包含111："+collection1.contains("111"));
        Collection collection2=new ArrayList();
        collection2.addAll(collection1);
        System.out.println("集合collection2的内容："+collection2);
        collection2.clear();
        System.out.println("集合collection2是否为空："+collection2.isEmpty());
        Object s[]=collection1.toArray();
        for(int i=0;i<s.length;i++)
        {
            System.out.println(s[i]);
        }
        
    }

}