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Accepted
Javier
Asked: 2020-09-03 14:00:05 +0800 CST 2020-09-03 14:00:05 +0800 CST

Various Threads methods in JAVA

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We know that a class that extends from Threadhas a method run()which is an independent thread, but how can I have several threads in a single class?

For example, if I have a class Jugadorand it has 2 methods (run, shoot), how can I make those 2 methods independent threads in 1 same class. Or you would have to create 2 classes, one for running and one for firing, because you can only have one method run().

Main

package hilos;

public class Hilos {

public static void main(String[] args) {


    acciones accion1 = new acciones();
    accion1.start();

}

}

Class with Threads

package hilos;

public class acciones extends Thread {

@Override
public void run()
{

// Código para correr 

} 

// Código para correr para nadar ????????????? como seria ??

}
java

1 Answers

  1. Best Answer

    The first thing to clarify is that the runclass method Threadis not a thread itself. The class Threadallows us to create independent threads on our own to execute a certain code that is what we include inside its method run. How does this work (roughly and without getting too technical? Well, when we create an object of type Threadand execute its method start, we are telling the Java virtual machine to create a new thread and execute the method code within it run.

    Having the above clear, and to achieve what you ask for, the following occurs to me:

    public class Acciones {

    public void correr() {...}

    public void disparar() {...}
}    

public static void main(String[] args) {
    Acciones acciones = new Acciones();

    new Thread(() -> acciones.correr()).start();
    new Thread(() -> acciones.disparar()).start();

}

    Here what we did was create an object of type Accionesand execute each of its methods in a Threadseparate.

    Note : In case you are not familiar with functional programming in Java, this code:

    () -> acciones.correr()

    It is equivalent to

    new Runnable() {
    public void run() {
        acciones.correr();
    }
}

    IMPORTANT: If the methods of a class are executed in different threads and these methods use shared resources of the class itself, you must use mutual exclusion techniques such as synchronization. This also applies to those methods that share any type of resources, whether these methods are in the same class or not. Multiprogramming or concurrent programming is not a trivial topic and I recommend that you study it in depth before applying it to real projects.

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