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Functional interfaces

Theory

A lambda expression with seven arguments

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Write a lambda expression that accepts seven (!) string arguments and returns a string in uppercase concatenated from all of them (in the order of arguments).

Solution format. Submit your lambda expression with seven arguments in any valid format with ; at the end.

Examples (only with two args): (x, y) -> x + y; (x, y) -> { return x + y; };

Sample Input 1: 

The lambda has too many string arguments.

Sample Output 1: 

THELAMBDAHASTOOMANYSTRINGARGUMENTS.
Write a program in Java 17
class Seven {
public static SeptenaryStringFunction fun = //write your code here
}

@FunctionalInterface
interface SeptenaryStringFunction {
String apply(String s1, String s2, String s3, String s4, String s5, String s6, String s7);
}
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