Deque getLast() method in Java
Last Updated :
17 Jan, 2022
The getLast() method of Deque Interface returns the last element or the tail of the Deque. It does not deletes the element. It throws an exception when the Deque is empty.
Syntax:
E getLast()
Parameters: This method does not accepts any parameter.
Returns: This method returns the last element or the tail of the Deque but does not delete it.
Exception: The function throws NoSuchElementException when the Deque is empty and the function is called.
Below programs illustrate getLast() method of Deque:
Program 1: With the help of LinkedList.
Java
import java.util.*;
public class GFG {
public static void main(String[] args)
throws IllegalStateException
{
Deque<Integer> DQ
= new LinkedList<Integer>();
DQ.add( 7855642 );
DQ.add( 35658786 );
DQ.add( 5278367 );
DQ.add( 74381793 );
System.out.println( "Deque: " + DQ);
System.out.println( "Deque's head: " + DQ.getLast());
}
}
|
Output:
Deque: [7855642, 35658786, 5278367, 74381793]
Deque's head: 74381793
Program 2: With the help of ArrayDeque.
Java
import java.util.*;
public class GFG {
public static void main(String[] args)
throws IllegalStateException
{
Deque<Integer> DQ
= new ArrayDeque<Integer>();
DQ.add( 7855642 );
DQ.add( 35658786 );
DQ.add( 5278367 );
DQ.add( 74381793 );
System.out.println( "Deque: " + DQ);
System.out.println( "Deque's head: " + DQ.getLast());
}
}
|
Output:
Deque: [7855642, 35658786, 5278367, 74381793]
Deque's head: 74381793
Program 3: With the help of ConcurrentLinkedDeque.
Java
import java.util.*;
import java.util.concurrent.ConcurrentLinkedDeque;
public class GFG {
public static void main(String[] args)
throws IllegalStateException
{
Deque<Integer> DQ
= new ConcurrentLinkedDeque<Integer>();
DQ.add( 7855642 );
DQ.add( 35658786 );
DQ.add( 5278367 );
DQ.add( 74381793 );
System.out.println( "Deque: " + DQ);
System.out.println( "Deque's head: " + DQ.getLast());
}
}
|
Output:
Deque: [7855642, 35658786, 5278367, 74381793]
Deque's head: 74381793
Program 4: With the help of LinkedBlockingDeque.
Java
import java.util.*;
import java.util.concurrent.LinkedBlockingDeque;
public class GFG {
public static void main(String[] args)
throws IllegalStateException
{
Deque<Integer> DQ
= new LinkedBlockingDeque<Integer>();
DQ.add( 7855642 );
DQ.add( 35658786 );
DQ.add( 5278367 );
DQ.add( 74381793 );
System.out.println( "Deque: " + DQ);
System.out.println( "Deque's head: " + DQ.getLast());
}
}
|
Output:
Deque: [7855642, 35658786, 5278367, 74381793]
Deque's head: 74381793
Program 5:
Java
import java.util.*;
public class GFG {
public static void main(String[] args)
throws IllegalStateException
{
Deque<Integer> DQ
= new LinkedList<Integer>();
DQ.add( 7855642 );
DQ.add( 35658786 );
DQ.add( 5278367 );
DQ.add( 74381793 );
System.out.println( "Deque: " + DQ);
System.out.println( "Deque's head: " + DQ.getLast());
DQ.clear();
System.out.println( "Deque's head: " + DQ.getLast());
}
}
|
Output:
Exception in thread "main" java.util.NoSuchElementException
at java.util.LinkedList.getLast(LinkedList.java:257)
at GFG.main(GFG.java:29)
Reference: https://docs.oracle.com/javase/8/docs/api/java/util/Deque.html#getLast–
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