可迭代的自定义链表

Question

i am writing a LinkedList class as part of an assignment. LinkedList.java:

LinkedList class: http://pastebin.com/KyKM3hP2

i am trying to get foreach working with my class.

LinkedList<LinkedList> ListA = new LinkedList<>();
LinkedList<String> ListB = new LinkedList<>();

ListB.append("Test1");
ListB.append("Test2");
ListB.append("Test3");

ListA.append(ListB);

//this works fine
for (String i : ListB){
    //do something with i
}
//this does not
for (String i : ListA.index(0)){
    //do something with i
}

//both the above loops should interate over ListB
//but only the first one does

Answer 1

you have to change the declaration of ListA to something like this

LinkedList<LinkedList<String>> ListA = new LinkedList<>();
for (String i : ListA.index(0)){
//do something with i 
}

if you want to get all strings in ListA then do it this way.

   for (List lis : YourList){
     for(String s : lis){
      //System.out.println(s);
     }
    }

if your linkedList contains LinkedList of LinkedLists of Strings then you have to use 2 enhanced for loops .

if you are using java 8 you can do it like this.

       Yourlist.forEach(templist ->{
       templist.forEach(s ->{
            System.out.println(s);
        });
        });