FunctionDemo.java

public class FunctionDemo {

    static Function<String, String> shortName = (s) -> {
        if (null == s || s.length() == 0) return "Unknown";
        String[] splits = s.split(" ");
        String ret = splits[0];
        if (splits.length >= 2) ret += " " + splits[1].substring(0, 1) + ".";
        return ret;
    };

    public static void main(String... args) {
        System.out.println(shortName.apply("Kazi Mahbubur Rahman"));
        System.out.println(shortName.apply("Adam Smith"));
    }
}