Today, C++, C#, Java, Visual Basic.NET and Python ... OOP Traditional Programming class define data + processing object data + processing attribute data (a field) method function message function ...

If a Java class has only a setter ... It supports functional programming in addition to object-oriented programming, offers a bunch of useful features (extension functions, builders, coroutines ...

Next, use the JDK compiler to turn your text file into an executable program. Compiled code in Java is known as bytecode, and carries the .class extension. That should result in a successful compile.