Java Collections .frequency ( Collection <?> c, Object o)
Syntax
Collections.frequency(Collection <?> c, Object o) has the following syntax.
public static int frequency(Collection <?> c, Object o)
Example
In the following code shows how to use Collections.frequency(Collection <?> c, Object o) method.
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
/*w w w. jav a2 s.c om*/
public class Main {
public static void main(String args[]) {
// create array list object
List<String> arrlist = new ArrayList<String>();
// populate the list
arrlist.add("A");
arrlist.add("B");
arrlist.add("B");
arrlist.add("B");
arrlist.add("B");
arrlist.add("from java2s.com");
// check frequensy of 'B'
int freq = Collections.frequency(arrlist, "B");
System.out.println("Frequency of 'B' is: "+freq);
}
}
The code above generates the following result.
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