The java.util.ArrayList.indexOf(Object) method returns the index of the first occurrence of the specified element in this list, or -1 if this list does not contain the element.

Java util ArrayList indexOf() Method Example

import java.util.ArrayList;
import java.util.List;

// Check if an ArrayList contains a given element | contains()

// Find the index of the first occurrence of an element in an ArrayList | indexOf()

// Find the index of the last occurrence of an element in an ArrayList | lastIndexOf()

public class SearchElementsInArrayListExample {
    public static void main(String[] args) {
          // Creating an ArrayList of String using
         List<String> fruits = new ArrayList<>();
        // Adding new elements to the ArrayList
        fruits.add("Banana");
        fruits.add("Apple");
        fruits.add("mango");
        fruits.add("orange");
        fruits.add("Watermelon");
        fruits.add("Strawberry");
    
        // Find the index of the first occurrence of an element in an ArrayList
        System.out.println("indexOf \"Banana\": " + fruits.indexOf("Banana"));
        System.out.println("indexOf \"Apple\": " + fruits.indexOf("Apple"));
    }
}

Output:

indexOf "Banana": 0
indexOf "Apple": 1

Reference

https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/ArrayList.html

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