Java

Re: get ethernet IP address

3-Oct-12 19:58

You don't need no double post to get an answer:

How to get ethernet IP address[^]

regards Torsten
When I'm not working

jschell4-Oct-12 11:44

jschell

4-Oct-12 11:44

hari301 wrote:
I need ethernet address only

You need to explain your problem more fully.

A TCP connection consists for two ends AND of the connections in between.

The fact that two ends connect does NOT mean that meaningful (non-private ip) is available on either end.

The fact that two ends connect does NOT mean that one end can recover a meaningful ip for the other end in such a way that it uniquely identifies the other end.

And of course connections have nothing to do with domain names.

Now some of the above might have something to do with your problem. Or not. But it isn't clear what you think you want (neither here nor your other post.)

Java Based Websevice

ashish121693-Oct-12 1:55

ashish12169

3-Oct-12 1:55

Hi,
i want to create a webservice in JAVA...pls share the code.....

Re: Java Based Websevice

Richard MacCutchan3-Oct-12 2:34

3-Oct-12 2:34

This sort of question is impossible to answer in a technical forum. If you want to create a web service then you need to do some research into the tools that are available to help you. A search with Google will get you started.

One of these days I'm going to think of a really clever signature.

Re: Java Based Websevice

TorstenH.3-Oct-12 2:36

How can I change a 8-bit bitmap into a 4-bit/1-bit bitmap?

3-Oct-12 2:36

Please at least try to type "Java Webservice Tutorial" @ Google.
It's so easy that I don't even want to post links here - would be a waste to web space.

regards Torsten
When I'm not working

Kangvampire2-Oct-12 22:11

Kangvampire

2-Oct-12 22:11

I have a bitmap, such as lena.bmp, which the number of bits per pixel is 8. How can I change the number of bits per pixel?

Creating a Thread

Neo101012-Oct-12 8:17

Neo10101

2-Oct-12 8:17

Consider the following code:

Java

public class MyThread extends Thread {
    @Override
    public void run(){
        System.out.println("Testing thread.");
    }
}

Java

public class App 
{
    public static void main( String[] args )
    {
        MyThread thread = new Thread();
    }
}

Why does the syntax checker not accept line 5 in 'App.java' (The one with the MyThread Reference Type)? If MyThread is aThread, then why is it incorrect to create a new Thread out of it? I know I'm supposed to replace it with new MyThread, but why is Thread not allowed? Doesn't 'extend' mean 'inherits all properties etc.'?

jschell2-Oct-12 8:46

jschell

2-Oct-12 8:46

CsTreval wrote:
If MyThread is aThread, then why is it incorrect to create a new Thread
out of it?

Your code is stating that 'Thread' is a 'MyThread' which it isn't.
The correct code would be..

Thread thread = new MyThread();

Richard MacCutchan2-Oct-12 9:32

2-Oct-12 9:32

You should be creating the same type as you have declared thus:

Java

MyThread thread = new MyThread();

One of these days I'm going to think of a really clever signature.

Neo101012-Oct-12 20:53

Neo10101

2-Oct-12 20:53

Yes, but there is also polymorphism as jschell said: Thread thread = new MyThread. I just got the assignment backwards. To me it is more logical to think of a=b instead b=a.

TorstenH.2-Oct-12 23:31

2-Oct-12 23:31

Thread thread = new MyThread();

...works, cause Thread is the parental to MyThread.
Using that leaves you with the basic functionality that is given in Thread (unless you cast Thread to a MyThread, then you'll be able to access the additional functions).

You could add additional functionality to any Object when you extend it - which is the basic meaning of extension.
So when initializing the Object you will have to choose the right one - the parental Object does not own the additional methods, does not know them.
You would not be able to access them.

Example:

Java

public class Vehicle{
// some basic functions, not important here
}

Java

public class Bus extends Vehicle{

  public int getSeatQuantity(){
  // return number of seats
  }
}

A vehicle can be anything from a bike up to a race car, truck, even a train.
It's not important for a bicycle or a race car how many seats it has. But it's important for a bus.

So when you want a Bus (...and later probably know how much seats are available) you will have to create a Bus and not just a Vehicle.
Simple said: it's more specific.

regards Torsten
When I'm not working

Peter_in_27802-Oct-12 22:05

Peter_in_2780

2-Oct-12 22:05

You've got the idea now, but consider this as another way of looking at it:
a MyThread is a Thread and then some. If you had added extra class members - code or data - in the definition of MyThread, it would have stood out like the proverbial.
Another clue is in Java's use of the keyword extends.

Cheers,
Peter

Software rusts. Simon Stephenson, ca 1994. So does this signature. me, 2012

pure java based code needed to read shedule and send an sms

Gowtham Gutha15-Nov-12 7:15

Gowtham Gutha

15-Nov-12 7:15

A super class reference variable has the capability to hold its sub class object but a sub class does not have that capability.

As MyThread is subclass of Thread, you can write

Thread t=new MyThread();

But not

MyThread m=new Thread();

That's false.

Gowtham Gutha (Java-Demos.Blogspot.com)

ask.sagaram2-Oct-12 7:08

ask.sagaram

2-Oct-12 7:08

Hi! every body i am very new to this and i need an help to start implementation of my idea

i need an application that has to the following things
1.it has to store all messages that came to my mobile

2.store them in a database the msg contains a mobilenumber date time and msg text

3.shedule and send them to that number at that time and date given in msg through my mobile number
please help if it possible any one has a solution

sagaram

Re: pure java based code needed to read shedule and send an sms

jschell2-Oct-12 8:50

jschell

2-Oct-12 8:50

Nothing that would make it implicitly impossible although running a database on a mobile without qualifying both of those is unlikely to be generally true.

ask.sagaram wrote:
any one has a solution

Solution
1. Investigate mobiles
2. Investigate databases on those mobiles
3. Pick a mobile and database (from 1 and 2)
4. Learn how to code database code on a mobile
5. Learn how java networking works and probably networking in general
6. Learn how SMS works.
7. Learn how SMS works on a mobile (which probably goes back to 1.)
8. Write code to do SMS for the mobile.
9. Combine all of the above into an application.

Re: pure java based code needed to read shedule and send an sms

ask.sagaram3-Oct-12 7:53

ask.sagaram

3-Oct-12 7:53

thanks for reply

AWT Native interface

AhmdAxf1-Oct-12 2:43

AhmdAxf

1-Oct-12 2:43

Hi I have to display a DIB image in java applet through AWT Native interface. I have been able to play a live video using this technology but drawing an image is taking too long especially when the conversion of a DIB image is very difficult.

Any help in this regard would be helpful

Hardware

stib_markc28-Sep-12 18:58

stib_markc

28-Sep-12 18:58

I don't know if this might sound silly, but is it possible to interact with hardware(say an audio card in my case) using Java.

The master of the art of living makes little distinction between his work and his play, his labor and his leisure, his mind and his body, his education and his recreation, his love and his religion. He hardly knows which is which; he simply pursues his vision of excellence in whatever he does, leaving others to decide whether he is working or playing. To him he is always doing both.

Richard MacCutchan28-Sep-12 22:15

28-Sep-12 22:15

Yes, it is possible. However, without a lot more information it's impossible to suggest much more than that. If you have a specific question then please update your post above with the details.

One of these days I'm going to think of a really clever signature.

stib_markc30-Sep-12 19:37

stib_markc

30-Sep-12 19:37

Quote:
without a lot more information it's impossible to suggest much more than that.

Yeah, I am sorry, but I have been asked to develop it in Java. I have used C++ before for sound operations using mmioAPIs but this project that I am going to work on contains several modules and one of the module is signal(generated by a digital hardware component) recording and replaying through different channels of a DAC card. Can this be done in Java? Anyway, the GUI of the application software should be written Java. This is must and should. I am new to Java and I use Eclipse IDE.

And I didn't down-vote you. Countered.

Richard MacCutchan30-Sep-12 22:07

30-Sep-12 22:07

stib_markc wrote:
And I didn't down-vote you.

Thanks, but don't worry about it, a few downvotes never hurt anyone.

As to your main question I have not looked at the links that the other guys have offered but they may answer your query. I have worked on similar projects in the past and found the best solution was to write the low-level stuff in C/C++ and use the Java Native Interface[^] to access it from the Java application.

One of these days I'm going to think of a really clever signature.

Joan M28-Sep-12 23:57

Joan M

28-Sep-12 23:57

Richard is 100% right, meanwhile, take a look at this link: http://www.coderanch.com/t/533684/java/java/Java-access-Sound-Card[^]

Probably the 6th thread from Carl Worley will help you.

Good luck!

[www.tamautomation.com] Robots, CNC and PLC machines for grinding and polishing.

stib_markc30-Sep-12 19:39

stib_markc

30-Sep-12 19:39

Thank you, I will look into it and get back.

TorstenH.29-Sep-12 2:18