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()); } } |
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()); } } |
Stack: [] Is the Stack empty? true
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.