Java by API/java.util/ArrayDeque

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new ArrayDeque()

   <source lang="java">

import java.util.ArrayDeque; import java.util.Deque; public class Main {

 public static void main(String[] args) {
   MyDequeue stack = new MyDequeue();
   for (int i = 0; i < 5; i++) {
     stack.push(i);
   }
   System.out.println("After pushing 5 elements: " + stack);
   int m = stack.pop();
   System.out.println("Popped element = " + m);
   System.out.println("After popping 1 element : " + stack);
   int n = stack.peek();
   System.out.println("Peeked element = " + n);
   System.out.println("After peeking 1 element : " + stack);
 }

} class MyDequeue {

 private Deque<Integer> data = new ArrayDeque<Integer>();
 public void push(Integer element) {
   data.addFirst(element);
 }
 public Integer pop() {
   return data.removeFirst();
 }
 public Integer peek() {
   return data.peekFirst();
 }
 public String toString() {
   return data.toString();
 }

}

 </source>