import java.util.function.Function;
 
class Main {
    public static void main(String[] args) {
        Function<String, String> f1 = Function.identity();
        Function<String, String> f2 = Function.identity();
        if (f1 == f2)
            System.out.println("Singleton object");
        Function<String, String> f3 = s -> s;
        Function<String, String> f4 = s -> s;
        if (f3 != f4)
            System.out.println("Different objects");
    }
}

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