通过arraylist打印列表2中的值

Question

i have 2 lists list 1 and list2 now i need to do a search in list 2 compared to list 1 if that element exisists i have written down the code but it is not printing?

Iterator<String> it=list1.iterator();
      while(it.hasNext())
      {
          if(list2.contains(it.next()))
          {
            System.out.println(list2);

          }


      }

Answer 1

Some options:

• At least one of your lists is empty.
• They have no objects in common.
• The class which you use does not implement equals correctly.

Answer 2

try

for(String s : list1){
   if(list2.contains(s)){
          System.out.println(s);
    }
}

based on that both lists contain String objects

Answer 3

Make sure neither list is empty and the definitely have something in common, then try:

for(String str in list1)
    if(list2.contains(str))
        System.out.println(str);