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Date value set to current datetime, after recall the date value is null
Output as below
D:\Example\javaux\OO>java appmotor
The engine is now on. Tue Oct 10 23:44:41 CST 2006 (Yamaha RZ350)
Engine Start date = Tue Oct 10 23:44:41 CST 2006
Detail:
Model is Yamaha RZ350
Color is Yello
Year is 2003
Engine Started on null
D:\Example\javaux\OO>
"Engine Started" should not null , should be Tue Oct 10 23:44:41 CST
2006.
What wrong as below two java program ?
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 String getEngineStartDate() {
return "xx";
}
void showDetail() {
System.out.println("\nDetail:");
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 +
"\n");
}
public void startEngine() {
if (engineStatus == true)
System.out.println("The engine is alreay on. " + EngineStartDate +
" (" + this.Model + ")");
else {
engineStatus = true;
Date EngineStartDate = new Date();
System.out.println("The engine is now on. " + EngineStartDate +
" (" + this.Model+ ")");
System.out.println("Engine Start date = " + EngineStartDate);
}
}
}
/* eof */
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;
}
}
/* Main Part */
public class appmotor {
public static void main (String args[]) {
M2 m = new M2();
m.setModel ("Yamaha RZ350");
m.setColor ("Yello");
m.setYear (2003);
m.startEngine();
m.showDetail();
// m.startEngine();
// m.showDetail();
}
}
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Reply
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 moon_ils-se (53)
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10/10/2006 3:50:58 PM |
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"moonhk" <moon_ils-se@yahoo.com.hk> wrote in message
news:1160495457.928202.31910@k70g2000cwa.googlegroups.com...
>
> "Engine Started" should not null , should be Tue Oct 10 23:44:41 CST
> 2006.
>
> What wrong as below two java program ?
>
[code snipped]
It might be easier for you to find the bug if you tried to make your
program as small as possible while still reproducing the problem:
http://mindprod.com/jgloss/sscce.html
For example, you can probably get rid of inheritance by getting rid of
the M2 class, and the problem will still be there.
- Oliver
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Reply
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 owong (5281)
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10/10/2006 4:30:33 PM
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Date EngineStartDate = new Date();
delete the first word in that line. Cheers.
opalpa
opalpa@gmail.com
http://opalpa.info/
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Reply
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 opalpa (277)
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10/10/2006 4:41:08 PM
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opalpa opalpa@gmail.com http://opalpa.info wrote:
> Date EngineStartDate = new Date();
>
> delete the first word in that line. Cheers.
>
> opalpa
> opalpa@gmail.com
> http://opalpa.info/
try to OK Now. Thank a lot. What problem ?
Change as below
public void startEngine() {
if (engineStatus == true)
System.out.println("\nThe engine is alreay on. " + EngineStartDate
+ " (" + this.Model + ")");
else {
engineStatus = true;
EngineStartDate = new Date(); /* New */
System.out.println("\nThe engine is now on. " + EngineStartDate +
" (" + this.Model+ ")");
System.out.println("Engine Start date = " + EngineStartDate);
}
}
}
D:\Example\javaux\OO>java appmotor
The engine is now on. Wed Oct 11 01:26:06 CST 2006 (Yamaha RZ350)
Engine Start date = Wed Oct 11 01:26:06 CST 2006
Details:
Model is Yamaha RZ350
Color is Yello
Year is 2003
Engine Started on Wed Oct 11 01:26:06 CST 2006
Speed is 100 mph
Year is 2003
Engine Started on null
Speed is 100 mph
D:\Example\javaux\OO>
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Reply
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moon_ils-se (53)
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10/10/2006 5:30:05 PM
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> try to OK Now. Thank a lot. What problem ?
>
> Change as below
>
> public void startEngine() {
> if (engineStatus == true)
> System.out.println("\nThe engine is alreay on. " + EngineStartDate
> + " (" + this.Model + ")");
> else {
> engineStatus = true;
> EngineStartDate = new Date(); /* New */
> System.out.println("\nThe engine is now on. " + EngineStartDate +
> " (" + this.Model+ ")");
> System.out.println("Engine Start date = " + EngineStartDate);
> }
> }
> }
>
These are all the changes? Did you change anything else?
> D:\Example\javaux\OO>java appmotor
>
> The engine is now on. Wed Oct 11 01:26:06 CST 2006 (Yamaha RZ350)
> Engine Start date = Wed Oct 11 01:26:06 CST 2006
>
> Details:
> Model is Yamaha RZ350
> Color is Yello
> Year is 2003
> Engine Started on Wed Oct 11 01:26:06 CST 2006
> Speed is 100 mph
> Year is 2003
> Engine Started on null
> Speed is 100 mph
> D:\Example\javaux\OO>
Using your source from original post: Its main method call showDetail()
once. The above output has more lines. The first problem looks
resolved. Repost source code.
opalpa
opalpa@gmail.com
http://opalpa.info/
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opalpa (277)
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10/10/2006 5:57:54 PM
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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();
}
}
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Reply
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moon_ils-se (53)
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10/11/2006 4:45:00 AM
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5 Replies
23 Views
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