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Text lesson

indexOf()

Example

Locate the position of an item within a list.

import java.util.ArrayList;

public class Main { 
  public static void main(String[] args) { 
    ArrayList<String> cars = new ArrayList<String>();
    cars.add("Volvo");
    cars.add("BMW");
    cars.add("Ford");
    cars.add("Mazda");
    System.out.println(cars.indexOf("Ford"));
  }     
}

Definition and Usage

The indexOf() method returns the position of the first occurrence of a value in the list. If the item is not found in the list then it returns -1.

Syntax

public int indexOf(Object item)

Parameter Values

Parameter	Description
item	Necessary. The item being sought within the list.

Technical Details

Returns:

The index of the first occurrence of the item in the list, or -1 if the item is not present.