Im trying to illustrate uses of instance vs static field members.
Just for myself to see how they work, and i think i have done this succesfully. But is there a way i can (for the sake of code reusability) only create one copy of get and set methods that i have defined in my classes, so i dont have to define them for every class? Would an interface be the logical way to go?

Code:
/*
  this is a test to see if a static member is diffrent from an 
  instance member. 
*/ 
 public class Test{
     public static void main(String[] args){
      
       Car NSX = new Car();
       Boat Fountain = new Boat();
      // show defalults 
       System.out.println("Max mph for your car is" + NSX.getMaxMPH());
       System.out.println("Max rpm for your car is" +  NSX.getMaxRPM());
       System.out.println(); 
       System.out.println("Max mph for your boat is" + Fountain.getMaxMPH());
       System.out.println("Max rpm for your boat is" +  Fountain.getMaxRPM()); 
       System.out.println();

       NSX.setMaxRPM(9000); // set new RMP for Boat also, since redline is shared among 
        // all instances; 

       System.out.println("Max mph for your car is" + NSX.getMaxMPH());
       System.out.println("Max rpm for your car is" +  NSX.getMaxRPM());
       System.out.println(); 
       System.out.println("Max mph for your boat is" + Fountain.getMaxMPH());
       System.out.println("Max rpm for your boat is" +  Fountain.getMaxRPM()); 
       System.out.println();

       NSX.setMaxMPH(230); // just set MPH for car since mph is an instance member.        

       System.out.println("Max mph for your car is" + NSX.getMaxMPH());
       System.out.println("Max rpm for your car is" +  NSX.getMaxRPM());
       System.out.println(); 
       System.out.println("Max mph for your boat is" + Fountain.getMaxMPH());
       System.out.println("Max rpm for your boat is" +  Fountain.getMaxRPM()); 
       System.out.println();

         }  
   }

   class Vehicle{
     protected  int mph; 
     protected static int redline;
    
     public Vehicle(int mph, int redline){
        this.mph = mph;
        this.redline = redline; 
      } 
    }

 class Car extends Vehicle{
   public Car(int mph, int redline){
     super(mph,redline);
       this.mph = mph;
       this.redline = redline;     
    }
    public Car(){
     this(200,6500); // defualts
     }
    public int getMaxRPM (){
         return redline;  
     }
    public int getMaxMPH(){
       return mph;
     }
    public void setMaxRPM(int setRPM){
        this.redline = setRPM; 
    } 
    public void setMaxMPH(int setMPH){
        this.mph = setMPH;  
    } 
}


 class Boat extends Vehicle{
   Boat(int mph, int redline){
     super(mph,redline);
       this.mph = mph;
       this.redline = redline;      
    }
   public Boat(){
     this(120,6500); // defualts
     }
   public int getMaxRPM(){
         return redline;  
     }
   public int getMaxMPH(){
       return mph;
     } 
  public void setMaxRPM(int setRPM){
        this.redline = setRPM; 
    } 
    public void setMaxMPH(int setMPH){
        this.mph = setMPH;  
    }      
}