Source Code as below

I add some coding
such as in
  public void showDetails() {
       // calls the superclass by prefixing it with a super
          super.showDetails();
          // Add New Item
          System.out.print("\tSpeed is " + speed + " mph");
  }

Also, do you how to call Motorcycle.showDetails() ?

Motorcycle.java
============
import java.util.*;
import java.text.*;

class Motorcycle {

private String Model;
private String Color;
private int Year;
private Date EngineStartDate;
private boolean engineStatus = false;

void setModel (String loName) {
    this.Model = loName;
}

void setColor(String loColor) {
    this.Color = loColor ;
}

void setYear (int loYear) {
    this.Year = loYear;

}

public void showDetails() {
    System.out.println("\nDetails:");
      System.out.println("\tModel is " + this.Model);
      System.out.println("\tColor is " + this.Color);
      System.out.println("\tYear is " + this.Year);
      System.out.println("\tEngine Started on " + EngineStartDate );

}
public void startEngine() {
 if (engineStatus == true)
  System.out.println("\nThe engine is alreay on. " + EngineStartDate
+  " (" + this.Model + ")");
 else {
    engineStatus = true;
    EngineStartDate = new Date();
    System.out.println("\nThe engine is now on. " + EngineStartDate  +
" (" + this.Model+ ")");
    }
}
}

/* eof */

appmotor.java
==========

import java.lang.*;

/* Testing Inheritance */
class M2 extends Motorcycle {
  private int speed;
  public void setSpeed(int loSpeed) {
          this.speed = loSpeed ;
  }
  public int getSpeed() {
          return this.speed;
  }
   public void showDetails() {
       // calls the superclass by prefixing it with a super
          super.showDetails();
          // Add New Item
          System.out.print("\tSpeed is " + speed + " mph");
  }
}

/* Main Part */
public class appmotor extends Thread {
public static void main (String args[]) {

     M2 m = new M2();

     m.setModel ("Yamaha RZ350");
     m.setColor ("Yello");
     m.setYear (2003);
     m.setSpeed(100);

     m.startEngine();
     m.showDetails();
     try {
         sleep (4000);
    } catch ( InterruptedException e) {}

    m.startEngine();  
     m.showDetails();

}
}