Java in three ways through the collection of

A set of three ways traversal operation

1. Iterator iterator way
2. Enhanced for loop
3. Ordinary for loop

code show as below:

 public static void test3(){
        ArrayList list = new ArrayList();
        list.add(123);
        list.add("AAAA");
        list.add("bb");
        list.add(new String("JavaEE"));
        list.add(new Date());
        list.add(false);
        // 遍历
        //1.Iterator迭代器方式
        Iterator iterator = list.iterator();
        while(iterator.hasNext()){
            System.out.println(iterator.next());
        }

        //2.增强for循环
        for(Object obj:list){
            System.out.println(obj);
        }
        //3.普通for循环
        for(int i=0;i<list.size();i++){
            System.out.println(list.get(i));
        }
    }
}