List set map queue deque stack

List

Mode one ：for loop

for(int i = 0;i = list.size();i++){
    System.out.println(list.get(i));
}

Mode two ：for each Loop traversal

for(String s : list){
    System.out.println(s);
}

Mode three ：iterator Iterator traversal

Iterator<String> it = list.iterator();
while(it.hasNext()){
      System.out.println(it.next());
}
      

Set

Mode one ：for each

for(String s : set){
    System.out.println(s);
}

Mode two ：iterator Iterator traversal

Iterator it = set.iterator();
while(it.hasNext()){
      System.out.println(it.next());
}

Map

Mode one ：for each Traverse Map Of key value

for(String key : map.keySet()){
   Integer value = map.get(key);
   System.out.println(key + "=' =value);
}

Mode two ：for each  At the same time through key and value

for(Map.Entry<String,Integer> entry : map.entrySet()){
   String key = entry.getKey();
   Integer value = entry.getValue();
   System.out.println(key + "=" + value):
}

Queue queue （FIFO)

Mode one : for each  Traverse the queue

for(String s : queue){
   System.out.println(s);
}

Mode two ：iterator  Iterator traverses queue

String item = null;
while((item = queue.poll()) != null){
     System.out.println(item);
}

Deque deque

iterator Iterator traversal

String item = null;
while((item = deque.poll.set()) != null){
     System.out.println(item);
}

Stack Stack (LIFO)

while(!stack.isEmpty()){
     System.out.println(stack.poll());
}