Click here to watch in Youtube : https://www.youtube.com/watch?v=31uzAazJ728&list=UUhwKlOVR041tngjerWxVccwCollectionsExample.java import java.util.ArrayList;import java.util.Collections;
/*
* Example of
* frequency(Collection<?> c,Object o) method
*/
public class CollectionsExample
{
public static void main(String[] args)
{
ArrayList<Integer> arrayList = new ArrayList<Integer>();
arrayList.add(2000);
arrayList.add(3000);
arrayList.add(4000);
arrayList.add(1000);
arrayList.add(2000);
arrayList.add(2000);
System.out.println("arrayList : " + arrayList + "\n");
/*
* Returns the number of elements in the specified collection equal to
* the specified object.
*/
int frequency = Collections.frequency(arrayList, 2000);
System.out.println("frequency : " + frequency);
}
}
Output arrayList : [2000, 3000, 4000, 1000, 2000, 2000]
frequency : 3