java中给集合添加一组元素的几种方法

package container;

import java.util.*;

/**
 * 给集合添加一组元素的集中方法
 */
public class AddingGroups {
    public static void main(String[] args) {
        //直接通过构造方法,添加一个集合
        Collection collection = new ArrayList(Arrays.asList(1,2,3,4,5));
        //将数组转化为集合添加
        Integer[] ints = {6,7,8,9};
        collection.addAll(Arrays.asList(ints));

        //通过Colletions类，添加集合
        Collections.addAll(collection,10,11,12);
        Collections.addAll(collection,ints);
        for (Integer integer : collection){
            System.out.println(integer);
        }
        System.out.println("----------------------------------------");
        List list = new ArrayList(Arrays.asList(13,14,15));
        list.set(1,99);
        list.add(21);
        for (Integer integer : list) {
            System.out.println(integer);
        }
    }
}