import java.util.function.Function; 

public class TestClassTypeReference { 

    public static void main(String[] args) { 
        new TestClassTypeReference().test(); 
    } 

    // Test the use of method references of the form: "ClassType :: [TypeArguments] new" 
    // See The Java Language Specification 15.13: Method Reference Expressions. 
    void test() { 
         
        char[] chars1 = {'A', 'B', 'C'}; 
        Function<char[], String> test1 = String::new; // Notional String(char[]) constructor. 
        String s1 = test1.apply(chars1); 
        System.out.println("s1 = " + s1); // Prints "ABC" 

        // Now repeat the previous test, but include some arbitrary [TypeArguments] in the method reference. 
        char[] chars2 = {'1', '2', '3'}; 
        // The following declaration compiles OK even though the four [TypeArguments] are meaningless. 
        Function<char[], String> test2 = String::<Class<?>, Short, Byte[], Thread>new; // Compiles OK!? 
        String s2 = test2.apply(chars2); 
        System.out.println("s2 = " + s2); // Prints "123" 
    } 
}