Helper.java Source code

Introduction

Here is the source code for Helper.java

Source

import java.util.HashMap;
import java.util.Map;

class Helper {
    public static <K, V> V get(Map<K, V> m, K key, V def) {
        V v = m.get(key);
        return (v != null) ? v : def;
    }
}

public class Main {

    public static void main(String[] args) {

        Map<String, Integer> m = new HashMap<String, Integer>();

        m.put("A", 42);
        m.put("B", 3);
        m.put("C", 1);

        System.out.println(Helper.get(m, "forty-two", -1));
        System.out.println(Helper.get(m, "A", -1));
        System.out.println(Helper.get(m, "B", -1));
        System.out.println(Helper.get(m, "something_else", -1));

    }
}