Java 中通配符的使用

@Test
    public void test3(){
        List<Object> list1 = null;
        List<String> list2 = null;
        List<?> list = null;
        list=list1;
        list=list2;
        employ(list1);
        employ(list2);
    }
    public void employ(List<?> list){
        //遍历list集合
        Iterator<?> iterator = list.iterator();
        while (iterator.hasNext()){
            Object next = iterator.next();
            System.out.println(next);
        }
    }