Java class in library module

LibraryJavaClass.java

public class LibraryJavaClass {
    int function1() {
        return 2 + 2;
    }

    int function2() {
        return 3 + 3;
    }

    int function3() {
        return 4 + 4;
    }

    int function4() {
        return 5 + 5;
    }
}