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If I have a queue with strings as values How would I print all the values I was using:

System.out.println(queue.elements().toString().); 

But it prints java objects...?

Do I have to use a loop to print values of queue?


Yes, you will need to use a loop however the loop can be simple like.

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

Actually, as long as it implements Iterable you should be able to do this type of foreach loop.

Queue add() method in Java, The element() method of Queue Interface returns the element at the front the container. It does not deletes the element in the container. This method returns the head of the queue. This method differs from peek() only in that it throws an exception if this queue is empty. 1. The answer depends on the type of queue. If it is a Queue or Deque, then your code won't compile, because these interfaces don't define an elements () method. This applies to most of the classes that implement Collection.


I don't understand your question. You say you want to print strings, and then after some code that doesn't compile, you say, "But it prints java objects...?" Strings are Java objects.

import java.util.*;

public class Foo {    
    public static void main(String[] args) {
        Queue<String> queue = new LinkedList<String>(); // create queue

        for (String name : args) queue.add(name); // add strings to queue

        System.out.println(queue); // print entire queue at once

        for (String s : queue) System.out.println(s); // print each separately
    }
}

Run with e.g., java Foo apple banana pear. The output is:

[apple, banana, pear]
apple
banana
pear

If the problem is that you are getting output like this:

[MyObject@498b5a73, MyObject@5bdf59bd, MyObject@247cb66a]
MyObject@498b5a73
MyObject@5bdf59bd
MyObject@247cb66a

Then your Queue does not actually hold Strings, and you have forgotten to override the toString() method in your class:

@Override public String toString() {
    return firstName + " " + lastName + ", " + quest + ", " + favoriteColor;
}

There is no need to use a loop, unless you don't [like, this, output, format].

What is the Java Queue interface?, The Java Queue supports all methods of Collection interface including insertion, deletion etc. LinkedList, ArrayBlockingQueue and PriorityQueue are the most  The Queues which are available in java.util package are Unbounded Queues; The Queues which are available in java.util.concurrent package are the Bounded Queues. All Queues except the Deques supports insertion and removal at the tail and head of the queue respectively. The Deques support element insertion and removal at both ends. Methods in Queue:


Queue (Java Platform SE 7 ), is capacity restricted and no space is left for insertion, it returns an IllegalStateException. The function returns true on successful insertion. Peek head of the QueueEnter 'n' value :3Enter the elementsaaabbbcccThe head of this queue, or null if this queue is emptyaaa. Peek head of the QueueEnter 'n' value :0Enter the elementsThe head of this queue, or null if this queue is emptynull. Previous Chapter.


Try this:

 Enumeration e = queue.elements();
 while ( e.hasMoreElements() )
    System.out.println( e.nextElement() );

Each of these methods exists in two forms: one throws an exception if the operation fails, the other returns a special value (either null or false, depending on the  Queue.java implements a FIFO queue of strings using a linked list. Like Stack, we maintain a reference first to the least-recently added Node on the queue. For efficiency, we also maintain a reference last to the most-recently added Node on the queue. Resizing array implementation of a queue. ResizingArrayQueue.java implements a queue using a


Look at Joiner in guava.

System.out.println(Joiner.on("\n").join(queue.elememts()));

This collections Java tutorial describes interfaces, implementations, and are priority queues, which order elements according to their values — see the Object​  Queue (Java Platform SE 7 ) Type Parameters: E - the type of elements held in this collection. All Superinterfaces: Collection <E>, Iterable <E>. All Known Subinterfaces: BlockingDeque <E>, BlockingQueue <E>, Deque <E>, TransferQueue <E>. All Known Implementing Classes: AbstractQueue, ArrayBlockingQueue, ArrayDeque, ConcurrentLinkedDeque, ConcurrentLinkedQueue, DelayQueue, LinkedBlockingDeque, LinkedBlockingQueue, LinkedList, LinkedTransferQueue, PriorityBlockingQueue, PriorityQueue,


This Java Queue tutorial explains how to use the Queue interface in will contain the value element 1 which is the first element in the Queue . Queue Implementation in Java Here I am trying to implement Queue using array and provides basic functionalities like enqueue(obj) , dequeue() and isEmpty() .


Java Queue is an interface available in java.util package and extends java.util. The other set of operations returns a special value if the operation fails. We first create a priority queue of integer values with a capacity of 16 elements. Then we add numbers using the add() method of the queue. Whenever you add a number, head of the queue is updated if a new value is less than or greater than head value. By default, elements are sorted in increasing order and head contains the smallest elements.


then adding each value to the sum as we progress through the loop. A first attempt might look like this: public static int sum(Queue<Integer> q) { int sum = 0;. PriorityQueue in Java. A PriorityQueue is used when the objects are supposed to be processed based on the priority. It is known that a queue follows First-In-First-Out algorithm, but sometimes the elements of the queue are needed to be processed according to the priority, that’s when the PriorityQueue comes into play.