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 ofArrayUtilsto 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.
