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Check the frequency of an element in Java with Collections.frequency
Create a List in Java −
List< String >list = Arrays.asList("P","Q","R","P","T","P","U","V","W","X","W" );Now, let’s say you want to get the frequency of element P. For that, use the Collections.frequency() method −
Collections.frequency(list, "P");
A shown above, we can find the occurrence of any letter as well −
Collections.frequency(list, "T");
Example
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
public class Demo {
public static void main(String[] args) {
List<String>list = Arrays.asList("P","Q","R","P","T","P","U","V","W","X","W" );
int checkOccurrence = Collections.frequency(list, "P");
System.out.println("Occurrence of P = " + checkOccurrence);
checkOccurrence = Collections.frequency(list, "W");
System.out.println("Occurrence of W = " + checkOccurrence);
checkOccurrence = Collections.frequency(list, "T");
System.out.println("Occurrence of T = " + checkOccurrence);
}
}Output
Occurrence of P = 3 Occurrence of W = 2 Occurrence of T = 1
Updated on: 30-Jul-2019
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