Stack removeAll() method in Java with Example

Last Updated : 24 Dec, 2018

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]

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