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class SuperClass {
  public SuperClass () {
    doLogic();
  }

  public void doLogic() {
    System.out.println("This is superclass!");
  }
}

class SubClass extends SuperClass {
  private String color = null;
  public SubClass() {
    super();
    color = "Red";
  }"red";

  public void doLogic() {
    System.out.println("This is subclass! The color is :" + color);
    // ...
  }
}

public class Overridable {
  public static void main(String[] args) {
    SuperClass bc = new SuperClass();
    // Prints "This is superclass!"
    SuperClass sc = new SubClass();
    // Prints "This is subclass! The color is :null"
  }
}