Check out example codes for "queue java". It will help you in understanding the concepts better.

Code Example 1

import java.util.*;

Queue<Integer> queue = new LinkedList<Integer>();
// use non-primative types when constructing

// to add a value to the back of queue:
queue.add(7);

// to remove and return front value:
int next = queue.remove();

// to just return front value without removing:
int peek = queue.peek();

Code Example 2

while (!QUEUE.isEmpty()) {
  QUEUE.remove();
 }

Code Example 3

 Queue<Integer> q = new LinkedList<>();

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