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Stack isEmpty() method in Java with Example

  • Last Updated : 24 Dec, 2018

The Java.util.Stack.isEmpty() method in Java is used to check and verify if a Stack is empty or not. It returns True if the Stack is empty else it returns False.

Syntax:

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Stack.isEmpty()

Parameters: This method does not take any parameter.

Return Value: This function returns True if the Stackis empty else it returns False.



Below programs illustrate the Java.util.Stack.isEmpty() method:

Program 1:




// Java code to illustrate isEmpty()
import java.util.*;
  
public class StackDemo {
    public static void main(String args[])
    {
        // Creating an empty Stack
        Stack<String> stack = new Stack<String>();
  
        // Use add() method to add elements into the Stack
        stack.add("Welcome");
        stack.add("To");
        stack.add("Geeks");
        stack.add("4");
        stack.add("Geeks");
  
        // Displaying the Stack
        System.out.println("Stack:  " + stack);
  
        // Verifying if the Stack is empty or not
        System.out.println("Is the Stack empty? "
                           + stack.isEmpty());
  
        // Clearing the Stack
        stack.clear();
  
        // Displaying the Stack
        System.out.println("Stack after clear(): "
                           + stack);
  
        // Verifying if the Stack is empty or not
        System.out.println("Is the Stack empty? "
                           + stack.isEmpty());
    }
}
Output:
Stack:  [Welcome, To, Geeks, 4, Geeks]
Is the Stack empty? false
Stack after clear(): []
Is the Stack empty? true

Program 2:




// Java code to illustrate isEmpty()
import java.util.*;
  
public class StackDemo {
    public static void main(String args[])
    {
        // Creating an empty Stack
        Stack<Integer> stack = new Stack<Integer>();
  
        // Displaying the Stack
        System.out.println("Stack:  " + stack);
  
        // Verifying if the Stack is empty or not
        System.out.println("Is the Stack empty? "
                           + stack.isEmpty());
    }
}
Output:
Stack:  []
Is the Stack empty? true



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