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.
Syntax:
Stack.removeAll(Collection col)
Parameters: This method accepts a mandatory parameter col which is the collection whose elements are to be removed from the Stack.
Return Value: This method returns true if the Stack is altered due to the operation at all, else False.
Exception: The method throws NullPointerException if the specified collection is null.
Below programs illustrate the Java.util.Stack.removeAll(Collection col) method:
Program 1:
// Java code to illustrate removeAll()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 in the Stack stack.add("Geeks"); stack.add("for"); stack.add("Geeks"); stack.add("10"); stack.add("20"); // Output the Stack System.out.println("Stack: " + stack); // Creating an empty Stack Stack<String> colstack = new Stack<String>(); // Use add() method to add elements in the Stack colstack.add("Geeks"); colstack.add("for"); colstack.add("Geeks"); // Remove the head using remove() boolean changed = stack.removeAll(colstack); // Print the result if (changed) System.out.println("Collection removed"); else System.out.println("Collection not removed"); // Print the final Stack System.out.println("Final Stack: " + stack); }} |
Output:
Stack: [Geeks, for, Geeks, 10, 20] Collection removed Final Stack: [10, 20]
Program 2:
// Java code to illustrate removeAll()import java.util.*; public class StackDemo { public static void main(String args[]) { // Creating an empty Stack Stack<Integer> stack = new Stack<Integer>(); // Use add() method to add elements in the Stack stack.add(1); stack.add(2); stack.add(3); stack.add(10); stack.add(20); // Output the Stack System.out.println("Stack: " + stack); // Creating an empty Stack Stack<Integer> colstack = new Stack<Integer>(); // Use add() method to add elements in the Stack colstack.add(30); colstack.add(40); colstack.add(50); // Remove the head using remove() boolean changed = stack.removeAll(colstack); // Print the result if (changed) System.out.println("Collection removed"); else System.out.println("Collection not removed"); // Print the final Stack System.out.println("Final Stack: " + stack); }} |
Output:
Stack: [1, 2, 3, 10, 20] Collection not removed Final Stack: [1, 2, 3, 10, 20]
