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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:

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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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