• It returns the index of the given element present in the ArrayList
• If there is more than one occurrence of the element then returns the last occurrence.
• If no element is present then returns the -1.

import java.util.*;

public class List1 {

public static void main(String[] args) {
String  ar[]={"india","pakistan","United Kingdom","Japan"};
List list=new ArrayList();
list.add(ar[0]);
list.add(ar[1]);
list.add(ar[2]);
list.add(ar[3]);
System.out.println(list.indexOf("Japan"));
System.out.println(list.indexOf(ar[2]));

}
}
Output
3
2

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