Practice›Java Fundamentals›Module 10. Collections›10.4 Patterns

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10.4 Patterns — count common values

Total: 0 / 3 pts

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Task

Fill in countCommon so that it returns the number of distinct values appearing in both arrays.

Use two sets: one holding the values of a, another collecting the matches so repeats collapse. The program prints 2.

Your solution

import java.util.HashSet;
import java.util.Set;

public class Main {

    public static int countCommon(String[] a, String[] b) {
        // count DISTINCT values present in both arrays

    }

    public static void main(String[] args) {
        System.out.println(countCommon(new String[]{"a", "b", "a", "c"}, new String[]{"b", "c", "d"}));
    }
}

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