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.
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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ArrayList
Collection Framework
Java
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