BE THE CODER > Java > Collections > Collection Frequency

The following example shows how to use Collections.frequency API. It returns the count of elements in the collection equal to user given object.

File Name :	com/bethecoder/tutorials/utils/collections/Frequency.java
Author :	Sudhakar KV
Email :	[email protected]


package com.bethecoder.tutorials.utils.collections;



import java.util.Arrays;

import java.util.Collections;

import java.util.List;





public class Frequency {



  /**

   * @param args

   */

  public static void main(String[] args) {

    

    List<Integer> intList = Arrays.asList(new Integer [] {

      2, 3, 4, 5, 6,

      2, 3, 4, 5,

      2, 3, 4,

      2, 3,

      2

    });

    

    System.out.println("List : " + intList);

    System.out.println();

    

    print(intList, 2);

    print(intList, 3);

    print(intList, 4);

    print(intList, 5);

    print(intList, 6);

    print(intList, 8);

  }

  

  private static void print(List<Integer> intList, Integer val2Check) {

    System.out.println("Frequency of '" + val2Check + "' : " + 

        Collections.frequency(intList, val2Check));

  }

}