Solved

Thread question...

Posted on 2004-09-02
8
239 Views
Last Modified: 2010-03-31
I asked this question last night...

http://oldlook.experts-exchange.com:8080/Programming/Programming_Languages/Java/Q_21116212.html

I want to be able to spawn a thread that spawns different class as well as my original.  Can I overload any of the methods?  How exactly do I spawn a thread that can run either one class, or another?
0
Comment
Question by:iismatt
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
8 Comments
 
LVL 11

Expert Comment

by:cjjclifford
ID: 11962689
Not sure what you are asking (couldn't infer anything from previous question...) but here's a go...

// objA is one runnable to run, objB is another runnable to run...
new Thread( new Runnable() { public void run() { objA.run(); objB.run(); } } ).start(); // runs objA and objB consequetively in a seperate thread.

// start objA and objB (both implement java.lang.Runnable) in seperate threads.
new Thread( objA ).start();
new Thread( objB ).start();
0
 
LVL 11

Expert Comment

by:cjjclifford
ID: 11962718
or you could do something like the following...

public class Test extends Thread {
    public Test( Runnable runnable ) {
        super( runnable );
    }
    public void run() {
        super.run();
        System.out.println( "Test's runnable..." );
    }
    public static void main( String[] args ) {
        new Test( new Runnable() { public void run() { System.out.println( "Runnable as argument" ); } } ).start();
    }
}
0
 
LVL 18

Expert Comment

by:armoghan
ID: 11962913
Do you want to start different threads from a thread?
if yes..
make other classes runnable as well and start them from the main thread
0
Salesforce Made Easy to Use

On-screen guidance at the moment of need enables you & your employees to focus on the core, you can now boost your adoption rates swiftly and simply with one easy tool.

 
LVL 35

Expert Comment

by:TimYates
ID: 11962919
Just make class A and class B implement Runnable, and give them both "run" methods

public class A implements Runnable
{
    public void run()
    {
        System.out.println( "A" ) ;
    }
}

public class B implements Runnable
{
    public void run()
    {
        System.out.println( "B" ) ;
    }
}

Then, just do:

A a = new A() ;
Thread t = new Thread( a ) ;
t.start() ;

or

B b = new B() ;
Thread t = new Thread( b ) ;
t.start() ;
0
 
LVL 35

Expert Comment

by:TimYates
ID: 11962922
bah...too slow... ;-)
0
 
LVL 1

Author Comment

by:iismatt
ID: 11963051
Here, let me clarify exactly what I'm confused about ... i have...

   public void run() {
         movingRandRect mrr = new movingRandRect();
    }

    void runProg() {
         if (t_movement==null); {
              Thread t_movement = new Thread(this);
              t_movement.start();
         }
    }

On some instances, I want to initiate my movingTriange.class instead of movingRandRect.  How would I do that?
0
 
LVL 35

Accepted Solution

by:
girionis earned 100 total points
ID: 11963131
Have a switch or something and do something like:

public boolean triangle = false;

...
...
triangle = true;

public void run() {
         if (triangle)
         {
             // instatiate movingTriangle
             triangle = false;
         }
         else
         {
                movingRandRect mrr = new movingRandRect();
         }
    }
0
 
LVL 35

Expert Comment

by:TimYates
ID: 11963138
Create an interface for your classes you want to pass to the thread...

public interface MyShape
{
    public void doStuff() ;
}

implement MyShape in movingRandRect and movingTriange classes, then write a Thread class like this:

public class Mover extends Thread
{
    MyShape shape = new MyShape() ;
    public Mover( MyShape shape )
    {
        this.shape = shape ;
    }

    public void run()
    {
        shape.doStuff() ;
    }
}

Then, you can do:

    void runProg() {
         if (t_movement==null);
         {
              Mover t_movement = new Mover( new movingRandRect() );
              t_movement.start();
         }
    }

or

    void runProg() {
         if (t_movement==null);
         {
              Mover t_movement = new Mover( new movingTriange() );
              t_movement.start();
         }
    }
0

Featured Post

Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

INTRODUCTION Working with files is a moderately common task in Java.  For most projects hard coding the file names, using parameters in configuration files, or using command-line arguments is sufficient.   However, when your application has vi…
Java functions are among the best things for programmers to work with as Java sites can be very easy to read and prepare. Java especially simplifies many processes in the coding industry as it helps integrate many forms of technology and different d…
Viewers learn about the “while” loop and how to utilize it correctly in Java. Additionally, viewers begin exploring how to include conditional statements within a while loop and avoid an endless loop. Define While Loop: Basic Example: Explanatio…
Viewers will learn about the different types of variables in Java and how to declare them. Decide the type of variable desired: Put the keyword corresponding to the type of variable in front of the variable name: Use the equal sign to assign a v…
Suggested Courses

739 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question