The java.util.vector.contains() method is used to check whether a specific element is present in the Vector or not. So basically it is used to check if a vector contains any particular element or not.
Syntax:
Vector.contains(Object element)
Parameters: This method takes a mandatory parameter element which is of the type of vector. This is the element that needs to be tested if it is present in the vector or not.
Return Value: This method returns True if the element is present in the vector otherwise it returns False.
Below programs illustrate the Java.util.Vector.contains() method:
Program 1:
Java
// Java code to illustrate contains()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 into the Vector vec_tor.add("Welcome"); vec_tor.add("To"); vec_tor.add("Geeks"); vec_tor.add("4"); vec_tor.add("Geeks"); // Displaying the Vector System.out.println("Vector: " + vec_tor); // Check for "Geeks" in the Vector System.out.println("Does the vector contains 'Geeks'? " + vec_tor.contains("Geeks")); // Check for "4" in the Vector System.out.println("Does the Vector contains '4'? " + vec_tor.contains("4")); // Check if the Queue contains "No" System.out.println("Does the Queue contains 'No'? " + vec_tor.contains("No")); }} |
Output:
Vector: [Welcome, To, Geeks, 4, Geeks] Does the vector contains 'Geeks'? true Does the Vector contains '4'? true Does the Queue contains 'No'? false
Program 2:
Java
// Java code to illustrate contains()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 into the Vector vec_tor.add(10); vec_tor.add(15); vec_tor.add(30); vec_tor.add(20); vec_tor.add(5); // Displaying the Vector System.out.println("Vector: " + vec_tor); // Check for "Geeks" in the Vector System.out.println("Does the vector contains 'Geeks'? " + vec_tor.contains("Geeks")); // Check for "4" in the Vector System.out.println("Does the Vector contains '4'? " + vec_tor.contains("4")); // Check if the vector contains "No" System.out.println("Does the Vector contains 'No'? " + vec_tor.contains("No")); }} |
Output:
Vector: [10, 15, 30, 20, 5] Does the vector contains 'Geeks'? false Does the Vector contains '4'? false Does the Vector contains 'No'? false
Time complexity: O(n), // n is the number of elements in the vector.
Auxiliary space: O(n)
