Java Utility Library

Java ArrayDeque - getFirst() Method

The java.util.ArrayDeque.getFirst() method returns, but does not remove, the first element of the deque.

Syntax

public E getFirst()

Here, E is the type of element maintained by the container.

Parameters

No parameter is required.

Return Value

Returns the first element of the deque.

Exception

Throws NoSuchElementException, if the deque is empty.

Example:

In the example below, the java.util.ArrayDeque.getFirst() method is used to print the content of the given deque.

import java.util.*;

public class MyClass {
  public static void main(String[] args) {
    //creating a ArrayDeque
    ArrayDeque<Integer> MyDeque = new ArrayDeque<Integer>();

    //populating ArrayDeque
    MyDeque.add(10);
    MyDeque.add(20);
    MyDeque.add(30);

    //printing ArrayDeque
    System.out.print("MyDeque contains: ");
    while(MyDeque.size() != 0)
    {
       System.out.print(MyDeque.getFirst()+ " ");
       MyDeque.pop();
    }
  }
}

The output of the above code will be:

MyDeque contains: 10 20 30

❮ Java.util - ArrayDeque