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Vector indexOf() Method in Java

The java.util.vector.indexOf(Object element) method is used to check and find the occurrence of a particular element in the vector. If the element is present then the index of the first occurrence of the element is returned otherwise -1 is returned if the vector does not contain the element.

Syntax:

Vector.indexOf(Object element)

Parameters: This method accepts a mandatory parameter element of the type of Vector. It specifies the element whose occurrence is needed to be checked in the Vector.


Return Value: This method returns the index or position of the first occurrence of the element in the vector. Else it returns -1 if the element is not present in the vector. The returned value is of integer type.

Below programs illustrate the Java.util.Vector.indexOf() method:

Program 1:
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// Java code to illustrate indexOf() 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" ); // Displaying the Vector System.out.println( "Vector: " + vec_tor); // The first position of an element // is returned System.out.println( "The first occurrence of Geeks is at index:" + vec_tor.indexOf( "Geeks" )); System.out.println( "The first occurrence of 10 is at index: " + vec_tor.indexOf( "10" )); } }

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Output:

Vector: [Geeks, for, Geeks, 10, 20]
The first occurrence of Geeks is at index:0
The first occurrence of 10 is at index: 3

Program 2:
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// Java code to illustrate indexOf() 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 ); // Displaying the Vector System.out.println( "Vector: " + vec_tor); // The first position of an element // is returned System.out.println( "The first occurrence of Geeks is at index:" + vec_tor.indexOf( 2 )); System.out.println( "The first occurrence of 10 is at index: " + vec_tor.indexOf( 20 )); } }

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Output:

Vector: [1, 2, 3, 10, 20]
The first occurrence of Geeks is at index:1
The first occurrence of 10 is at index: 4



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Article Tags :
Java Java - util package
Java-Collections
Java-Functions
Java-Vector
Practice Tags :
Java
Java-Collections

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