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:
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
