Statically initialized map

Test.java

import java.util.HashMap;
import java.util.Map;
public class Test {
    public static void main(String[] args) {
        Map<Integer, String> tens = new HashMap<Integer, String>(){{
            put(10, "ten");
            put(20, "twenty");
            put(30, "thirty");
            put(40, "fourty");
            put(50, "fifty");
            put(60, "sixty");
        }};

        System.out.println(tens.get(10));
    }
}

Technically you don't need the java.util.Map; import since you're not using this HashMap as a Map elsewhere. ;)