通过方法继承重用Java代码

Question

I am looking for a way to achieve code reuse in Java. A number of classes should have their own (static) data. They should all have a common method, but the method should operate on their own data. The code below returns only "BASE DATA" lines, while the desired output would be BASE DATA, Above1 DATA, Above2 DATA, etc. etc.

What is the proper way to achieve this in Java?

public class Base{
  static private String data="BASE DATA";
  static void printData(){System.out.println(data);}

  public static void main(String[] args){
    Base.printData();
    Above1.printData();
    Above2.printData();
    Above3.printData();
  }

}//Base

class Above1 extends Base {
  static private String data="Above1 DATA";
}//Above1

class Above2 extends Base {
  static private String data="Above2 DATA";
}//Above2

class Above3 extends Base {
  static private String data="Above3 DATA";
}//Above3

Answer 1

Use the command pattern (or visitor if you prefer).

The functionality will be inplemented as a command object which is passed to each class.

The class will then execute the command, passing its static data into the command.