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// functional/ProduceFunction.java

// (c)2021 MindView LLC: see Copyright.txt

// We make no guarantees that this code is fit for any purpose.

// Visit http://OnJava8.com for more book information.

import java.util.function.*;

interface

FuncSS extends Function<String, String> {} // [1]

public class ProduceFunction {

static FuncSS produce() {

return s -> s.toLowerCase(); // [2]

}

public static void main(String[] args) {

FuncSS f = produce();

System.out.println(f.apply("YELLING"));

}

}

/* Output:

yelling

*/