ArrayDeque removeFirst() Method in Java
The Java.util.ArrayDeque.removeFirst() method is used to remove the first element of the Deque.
Syntax:
Array_Deque.removeFirst()
Parameters: The method does not take any parameters.
Return Value: This method returns the first element of the Deque after removing it.
Exceptions: The method throws NoSuchElementException is thrown if the deque is empty.
Below programs illustrate the Java.util.ArrayDeque.removeFirst() method:
Program 1:
import java.util.*;
public class ArrayDequeDemo {
public static void main(String args[])
{
Deque<String> de_que = new ArrayDeque<String>();
de_que.add( "Welcome" );
de_que.add( "To" );
de_que.add( "Geeks" );
de_que.add( "For" );
de_que.add( "Geeks" );
System.out.println( "Initial ArrayDeque: " + de_que);
de_que.removeFirst();
de_que.removeFirst();
de_que.removeFirst();
System.out.println( "ArrayDeque after removing "
+ "elements: " + de_que);
}
}
|
Output:
Initial ArrayDeque: [Welcome, To, Geeks, For, Geeks]
ArrayDeque after removing elements: [For, Geeks]
Program 2:
import java.util.*;
public class ArrayDequeDemo {
public static void main(String args[])
{
Deque<Integer> de_que = new ArrayDeque<Integer>();
de_que.add( 10 );
de_que.add( 15 );
de_que.add( 30 );
de_que.add( 20 );
de_que.add( 5 );
System.out.println( "Initial ArrayDeque: " + de_que);
de_que.removeFirst();
de_que.removeFirst();
System.out.println( "ArrayDeque after removing "
+ "elements: " + de_que);
}
}
|
Output:
Initial ArrayDeque: [10, 15, 30, 20, 5]
ArrayDeque after removing elements: [30, 20, 5]
Last Updated :
10 Dec, 2018
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