Java Collection Tutorial - Java Deque.peekFirst()

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Syntax

Deque.peekFirst() has the following syntax.

E peekFirst()

Example

In the following code shows how to use Deque.peekFirst() method.

import java.util.ArrayDeque;
import java.util.Deque;
/*w  w  w . j a v a  2 s  . c om*/
public class Main {
   public static void main(String[] args) {
      
      
      Deque<Integer>  deque = new ArrayDeque<Integer> (8);

      
      deque.add(1);
      deque.add(2);
      deque.add(4);
      deque.add(5);        
           
      int retval = deque.peekFirst();
      System.out.println("Retrieved Element is " + retval);
    
      System.out.println(deque);
   }
}

The code above generates the following result.

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