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

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