Stack isEmpty() method in Java with Example Last Updated : 24 Dec, 2018 Comments Improve Suggest changes Like Article Like Report 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 // 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 // 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 Comment More infoAdvertise with us Next Article Stack isEmpty() method in Java with Example C code_r Follow Improve Article Tags : Java Java-Collections Java - util package Java-Functions Java-Stack +1 More Practice Tags : JavaJava-Collections Similar Reads Stack setElementAt() method in Java with Example The setElementAt() method of Java Stack is used to set the component at the specified index of this vector to be the specified object. The previous component at that position is discarded. The index must be a value greater than or equal to 0 and less than the current size of the vector. Syntax: publ 2 min read Stack retainAll() method in Java with Example The retainAll() method of java.util.Stack class is used to retain from this stack all of its elements that are contained in the specified collection. Syntax: public boolean retainAll(Collection c) Parameters: This method takes collection c as a parameter containing elements to be retained from this 3 min read Stack hashCode() method in Java with Example The Java.util.Stack.hashCode() method in Java is used to get the hashcode value of this Stack. Syntax: Stack.hashCode() Parameters: The method does not take any parameter. Return Value: The method returns hash code value of this Stack which is of Integer type. Below programs illustrate the Java.util 2 min read Stack removeAll() method in Java with Example The Java.util.Stack.removeAll(Collection col) method is used to remove all the elements from the Stack, present in the collection specified. 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Return Value: The method returns the first elem 2 min read Stack lastElement() method in Java with Example The Java.util.Stack.lastElement() method in Java is used to retrieve or fetch the last element of the Stack. It returns the element present at the last index of the Stack. Syntax: Stack.lastElement() Parameters: The method does not take any parameter. Return Value: The method returns the last elemen 2 min read Stack ensureCapacity() method in Java with Example The ensureCapacity() method of Java.util.Stack class increases the capacity of this Stack instance, if necessary, to ensure that it can hold at least the number of elements specified by the minimum capacity argument. Syntax: public void ensureCapacity(int minCapacity) Parameters: This method takes t 2 min read Stack elements() method in Java with Example The Java.util.Stack.elements() method of Stack class in Java is used to get the enumeration of the values present in the Stack. 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