Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
What does the method indexOf(obj o) do in java?
The indexOf(Object) method of the java.util.ArrayList class returns the index of the first occurrence of the specified element in this list, or -1 if this list does not contain the element.
Example
import java.util.ArrayList;
public class ArrayListDemo {
public static void main(String[] args) {
ArrayList<String> arrlist = new ArrayList<String>(5);
arrlist.add("G");
arrlist.add("E");
arrlist.add("F");
arrlist.add("M");
System.out.println("Size of list: " + arrlist.size());
for (String value : arrlist) {
System.out.println("Value = " + value);
}
int retval=arrlist.indexOf("E");
System.out.println("The element E is at index " + retval);
}
}output
Size of list: 4 Value = G Value = E Value = F Value = M The element E is at index 1
Updated on: 20-Feb-2020
81 Views
Advertisements