# How to find repeated element count in a collection?

The java.util.Collections class consists exclusively of static methods that operate on or return collections. It contains polymorphic algorithms that operate on collections, “wrappers”, which return a new collection backed by a specified collection, and a few other odds and ends.

Collections.frequency() method will returns the number of elements in the specified collection equal to the specified object.
Syntax: public static int frequency(Collection c, Object o)

## Example

 package com.w3spoint;   import java.util.ArrayList; import java.util.Collections; import java.util.List;   public class Test { public static void main(String a[]){ List list = new ArrayList(); list.add("vikas"); list.add("ajay"); list.add("mahesh"); list.add("anil"); list.add("vikas"); list.add("anil"); list.add("anil"); list.add("mahesh"); System.out.println("Actual list: "+list); System.out.println("Frequency of 'vikas': "+Collections.frequency(list, "vikas")); System.out.println("Frequency of 'ajay': "+Collections.frequency(list, "ajay")); System.out.println("Frequency of 'mahesh': "+Collections.frequency(list, "mahesh")); System.out.println("Frequency of 'anil': "+Collections.frequency(list, "anil")); } }

## Output

 Actual list: [vikas, ajay, mahesh, anil, vikas, anil, anil, mahesh] Frequency of 'vikas': 2 Frequency of 'ajay': 1 Frequency of 'mahesh': 2 Frequency of 'anil': 3