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:
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()); } } |
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()); } } |
The stack is: [8, 5, 9, 2, 4] Is the stack empty? false
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