Vector removeAll() Method in Java
Last Updated :
24 May, 2023
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The java.util.vector.removeAll(Collection col) method is used to remove all the elements from the vector, present in the collection specified.
Syntax:
Vector.removeAll(Collection col)
Parameters: This method accepts a mandatory parameter col which is the collection whose elements are to be removed from the vector.
Return Value: This method returns true if the vector 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.Vector.removeAll(Collection col) method:
Program 1:
Java
// Java code to illustrate removeAll()import java.util.*;public class VectorDemo { public static void main(String args[]) { // Creating an empty Vector Vector<String> vec_tor = new Vector<String>(); // Use add() method to add elements in the Vector vec_tor.add("Geeks"); vec_tor.add("for"); vec_tor.add("Geeks"); vec_tor.add("10"); vec_tor.add("20"); // Output the Vector System.out.println("Vector: " + vec_tor); // Creating an empty Vector Vector<String> colvec_tor = new Vector<String>(); // Use add() method to add elements in the Vector colvec_tor.add("Geeks"); colvec_tor.add("for"); colvec_tor.add("Geeks"); // Remove the head using remove() boolean changed = vec_tor.removeAll(colvec_tor); // Print the result if (changed) System.out.println("Collection removed"); else System.out.println("Collection not removed"); // Print the final Vector System.out.println("Final Vector: " + vec_tor); }} |
Output:
Vector: [Geeks, for, Geeks, 10, 20] Collection removed Final Vector: [10, 20]
Program 2:
Java
// Java code to illustrate removeAll()import java.util.*;public class VectorDemo { public static void main(String args[]) { // Creating an empty Vector Vector<Integer> vec_tor = new Vector<Integer>(); // Use add() method to add elements in the Vector vec_tor.add(1); vec_tor.add(2); vec_tor.add(3); vec_tor.add(10); vec_tor.add(20); // Output the Vector System.out.println("Vector: " + vec_tor); // Creating an empty Vector Vector<Integer> colvec_tor = new Vector<Integer>(); // Use add() method to add elements in the Vector colvec_tor.add(30); colvec_tor.add(40); colvec_tor.add(50); // Remove the head using remove() boolean changed = vec_tor.removeAll(colvec_tor); // Print the result if (changed) System.out.println("Collection removed"); else System.out.println("Collection not removed"); // Print the final Vector System.out.println("Final Vector: " + vec_tor); }} |
Output:
Vector: [1, 2, 3, 10, 20] Collection not removed Final Vector: [1, 2, 3, 10, 20]
Time complexity: O(n^2). // n is the size of the vector.
Auxiliary Space: O(n).
