Re: Date value set to current datetime, after recall the date value is null

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();

}
}