how to get index of arraylist in java

To get the index of an element in an ArrayList in Java, you can use the indexOf() method of the ArrayList class. This method takes an element as an argument and returns the index of the first occurrence of the element in the list, or -1 if the element is not present in the list.

Here's an example of how you can get the index of an element in an ArrayList in Java:

import java.util.ArrayList;

// ...

ArrayList<String> names = new ArrayList<>();
names.add("Alice");
names.add("Bob");
names.add("Charlie");
names.add("David");

int index = names.indexOf("Charlie");

In this example, the names list is an ArrayList object containing four strings. The index variable holds the index of the element "Charlie" in the list.

You can also use the lastIndexOf() method to get the index of the last occurrence of an element in the list.