Two parameters in the Lambda expression

[emerson]

How do you put the lymbda expression on two different parameters? For example

Function<Integer, String> getConcatenatedString = (amount, s) -> {...}

amount - Integer, s - String.

Is there any other possibility, other than defining an interface like:

 @FunctionalInterface
 interface Function3<A, B, R> {
    public R apply (A a, B b);
}

[courtlanda]

You probably need the following design:

BiFunction<Integer, String, String> getConcatenatedString =
    (Integer amount, String s) -> { 
        return Integer.toString(amount) + " " + s;
    };

By the way, since the lymbda expression is the only one, it can be shorter:

BiFunction<Integer, String, String> getConcatenatedString =
    (Integer amount, String s) -> Integer.toString(amount) + " " + s;