Question

I’m new to Java and i want a refinement:
First of all,i am not sure if i can have 2 classes in the same file.
My question is what is each class when you see this sequence of code:

class Something {    
    //code here
} //end of class Something

public class SomethingElse {
    //NO code here!!!
    public static void main(String[] args) {
        //code of main here
    }//end of main
}

What’s the role of the class Something Else and why there is no code inside?I know that is a very stupid question but there are some details that i don’t really get and i want some help…

Answer 1

You can have just one public class per file, and the file must have the same name of the class. But you can have other private classes that just the file class will see. For example:

File Something.java

public class Something {
  //Something can access SomethingElse's doSomething method.

  private class SomethingElse {
    public void doSomething() {
    }
  }
}

class SomethingToo {

}

File OtherSomething.java

public class OtherSomething {
  //OtherSomething cannot access SomethingElse's doSomething method.
  //But can access SomethingToo, if they are in the same package
}