Java ArrayDeque getLast() Method

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Description

The Java ArrayDeque getLast() method retrieves, but does not remove, the last element of this deque. The ArrayDeque object remains untouched.

Declaration

Following is the declaration for java.util.ArrayDeque.getLast() method

public E getLast()

Parameters

NA

Return Value

This method returns the tail of this deque.

Exception

NoSuchElementException − if this deque is empty.

Getting Last Element of an ArrayDeque of Integers Example

The following example shows the usage of Java ArrayDeque getLast() method with Integers. We're creating an ArrayDeque of Integers, adding some elements, print it and then use getLast() method to get the last element. ArrayDeque remains untouched.

package com.tutorialspoint;

import java.util.ArrayDeque;

public class ArrayDequeDemo {
   public static void main(String[] args) {
      
      // create an empty array deque
      ArrayDeque<Integer> deque = new ArrayDeque<>();

      // use add() method to add elements in the deque
      deque.add(25);
      deque.add(30);
      deque.add(20);
      deque.add(18);        

      // let us print all the elements available in deque
      System.out.println("ArrayDeque = " + deque);

      // it will retrieve last element
      System.out.println("Retrieved Element is = " + deque.getLast());
	  
      // let us print all the elements available in deque again
      System.out.println("ArrayDeque = " + deque);
   }
}

Output

Let us compile and run the above program, this will produce the following result −

ArrayDeque = [25, 30, 20, 18]
Retrieved Element is = 18
ArrayDeque = [25, 30, 20, 18]

Getting Last Element of an ArrayDeque of Strings Example

The following example shows the usage of Java ArrayDeque getLast() method with Strings. We're creating an ArrayDeque of Strings, adding some elements, print it and then use getLast() method to get the last element. ArrayDeque remains untouched.

package com.tutorialspoint;

import java.util.ArrayDeque;

public class ArrayDequeDemo {
   public static void main(String[] args) {
      
      // create an empty array deque
      ArrayDeque<String> deque = new ArrayDeque<>();

      // use add() method to add elements in the deque
      deque.add("A");
      deque.add("B");
      deque.add("C");
      deque.add("D");        

      // let us print all the elements available in deque
      System.out.println("ArrayDeque = " + deque);

      // it will retrieve last element
      System.out.println("Retrieved Element is = " + deque.getLast());
	  
      // let us print all the elements available in deque again
      System.out.println("ArrayDeque = " + deque);
   }
}

Output

Let us compile and run the above program, this will produce the following result −

ArrayDeque = [A, B, C, D]
Retrieved Element is = D
ArrayDeque = [A, B, C, D]

Getting Last Element of an ArrayDeque of Objects Example

The following example shows the usage of Java ArrayDeque getLast() method with Student objects. We're creating an ArrayDeque of Student objects, adding some students, print it and then use getLast() method to get the last student. ArrayDeque remains untouched.

package com.tutorialspoint;

import java.util.ArrayDeque;

public class ArrayDequeDemo {
   public static void main(String[] args) {
      
      // create an empty array deque
      ArrayDeque<Student> deque = new ArrayDeque<>();

      // use add() method to add elements in the deque
      deque.add(new Student(1, "Julie"));
      deque.add(new Student(2, "Robert"));
      deque.add(new Student(3, "Adam"));       

      // let us print all the elements available in deque
      System.out.println("ArrayDeque = " + deque);

      // it will retrieve last element
      System.out.println("Retrieved Element is = " + deque.getLast());
	  
      // let us print all the elements available in deque again
      System.out.println("ArrayDeque = " + deque);
   }
}
class Student {
   int rollNo;
   String name;

   Student(int rollNo, String name){
      this.rollNo = rollNo;
      this.name = name;
   }

   @Override
   public String toString() {
      return "[ " + this.rollNo + ", " + this.name + " ]";
   }
   
   @Override
   public boolean equals(Object obj) {
      Student s = (Student)obj;
      return this.rollNo == s.rollNo && this.name.equalsIgnoreCase(s.name);
   }
}

Output

Let us compile and run the above program, this will produce the following result −

ArrayDeque = [[ 1, Julie ], [ 2, Robert ], [ 3, Adam ]]
Retrieved Element is = [ 3, Adam ]
ArrayDeque = [[ 1, Julie ], [ 2, Robert ], [ 3, Adam ]]