Stack empty() Method in Java

Difficulty Level : Basic
Last Updated : 02 Aug, 2018

The java.util.Stack.empty() method in Java is used to check whether a stack is empty or not. The method is of boolean type and returns true if the stack is empty else false.

Syntax:

STACK.empty()

Parameters: The method does not take any parameters.

Return Value: The method returns boolean true if the stack is empty else it returns false.

Below programs illustrate the working of java.util.Stack.empty() method:
Program 1:

// Java code to demonstrate empty() method
import java.util.*;
  
public class Stack_Demo {
    public static void main(String[] args)
    {
  
        // Creating an empty Stack
        Stack<String> STACK = new Stack<String>();
  
        // Stacking strings
        STACK.push("Geeks");
        STACK.push("4");
        STACK.push("Geeks");
        STACK.push("Welcomes");
        STACK.push("You");
  
        // Displaying the Stack
        System.out.println("The stack is: " + STACK);
  
        // Checking for the emptiness of stack
        System.out.println("Is the stack empty? " + 
                                      STACK.empty());
  
        // Popping out all the elements
        STACK.pop();
        STACK.pop();
        STACK.pop();
        STACK.pop();
        STACK.pop();
  
        // Checking for the emptiness of stack
        System.out.println("Is the stack empty? " + 
                                     STACK.empty());
    }
}

Output:

The stack is: [Geeks, 4, Geeks, Welcomes, You]
Is the stack empty? false
Is the stack empty? true

Program 2:

// Java code to demonstrate empty() method
import java.util.*;
  
public class Stack_Demo {
    public static void main(String[] args)
    {
  
        // Creating an empty Stack
        Stack<Integer> STACK = new Stack<Integer>();
  
        // Stacking int values
        STACK.push(8);
        STACK.push(5);
        STACK.push(9);
        STACK.push(2);
        STACK.push(4);
  
        // Displaying the Stack
        System.out.println("The stack is: " + STACK);
  
        // Checking for the emptiness of stack
        System.out.println("Is the stack empty? " + 
                                      STACK.empty());
    }
}

Output:

The stack is: [8, 5, 9, 2, 4]
Is the stack empty? false

Attention reader! Don’t stop learning now. Get hold of all the important Java Foundation and Collections concepts with the Fundamentals of Java and Java Collections Course at a student-friendly price and become industry ready. To complete your preparation from learning a language to DS Algo and many more, please refer Complete Interview Preparation Course.

My Personal Notes

Related Articles