With this example we are going to demonstrate how to find elements in an array. We are using the org.apache.commons.lang3.ArrayUtils class, that provides operations on arrays, primitive arrays (like int[]) and primitive wrapper arrays (like Integer[]). In short, to find elements in an array you should:

• Create a String array.
• Use contains(Object[] array, Object objectToFind) method of ArrayUtils to check if the object is in the given array.
• Use the indexOf(Object[] array, Object objectToFind) method find the index of the given object in the array.
• Use the lastIndexOf(Object[] array, Object objectToFind) method to find the last index of the given object within the array.

Let’s take a look at the code snippet that follows:  

package com.javacodegeeks.snippets.core;
 
import org.apache.commons.lang3.ArrayUtils;

public class FindIndexes {
    
	public static void main(String[] args) {
    
		String[] fruits = { "Orange", "Apple", "Blueberry", "Guava"


    , "Apple", "Peach", "Orange", "Strawberry" };

   

  // Check if fruits array contains Guava

  boolean contains = ArrayUtils.contains(fruits, "Guava");
 

  System.out.println("Contains Guava? Answer = " + contains);

   

  // Find the index of Blueberry

  int indexOfBlueberry = ArrayUtils.indexOf(fruits, "Blueberry");

  System.out.println("index of Blueberry = " + indexOfBlueberry);
 

  // Find the index of first Orange

  int indexOfOrange = ArrayUtils.indexOf(fruits, "Orange");

  System.out.println("index of Orange = " + indexOfOrange);

  

  // Find the last index of Orange

  int lastIndexOfOrange = ArrayUtils.lastIndexOf(fruits, "Orange");

  System.out.println("last index of Orange = " + lastIndexOfOrange);
    }
}

Output:

Contains Guava? Answer = true
index of Blueberry = 2
index of Orange = 0
last index of Orange = 6

  
This was an example of how to find elements in an array in Java.