package collection;

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.Iterator;

public class CollectionTest03 {
    public static void main(String[] args) {
        // 创建集合对象
        Collection c1 = new ArrayList();// 有序可重复

        // 添加元素
        c1.add(1);
        c1.add(2);
        c1.add(3);
        c1.add(4);
        c1.add(1);

        // 迭代集合
        /*Iterator it = c1.iterator();
        while (it.hasNext()){
            Object obj = it.next();
            System.out.println(obj);
        }*/
        print(c1.iterator());

        // 创建集合对象
        Collection c2 = new HashSet();// 无序不重复
        c2.add(100);
        c2.add(200);
        c2.add(300);
        c2.add(90);
        c2.add(400);
        c2.add(50);
        c2.add(60);
        c2.add(100);
        /*Iterator it2 = c2.iterator();
        while (it2.hasNext()){
            Object obj = it2.next();
            System.out.println(obj);
        }*/
        print(c2.iterator());
    }

    public static void print(Iterator it){
        while (it.hasNext()){
            System.out.println(it.next());
        }
    }
}