Java Deque pollFirst() Method

The pollFirst() method of Java Deque Interface is used to retrieve and remove the first element of the deque. The method may return null if the given deque is empty.

Syntax:

Parameter:

NA

Return:

The above method is used to return the head of the deque. On the other hand, if the deque is empty, the method may return null.

Example 1

Output:

The first character is given as : q
The remaining deque is : 
u
e
r
y

Example 2

Output:

The first string is given as : Hello
The remaining deque is : [ , World]

Example 3

Output:

The first long value is given as : 88
The resultant deque is : [88, 78, 67]