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 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"));
}
} |
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 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"));
}
} |
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)