Java util ArrayList indexOf() Method Example

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


Java ArrayList Source Code Examples


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