Runnable and Call able - Java rekrutacja

Runnable - interfejs zawierający metode run() - obiekt implementujący tą metodę tworzy wątek thread

public interface Runnable

The Runnable interface should be implemented by any class whose instances are intended to be executed by a thread. The class must define a method of no arguments called run.

This interface is designed to provide a common protocol for objects that wish to execute code while they are active. For example, Runnable is implemented by class Thread. Being active simply means that a thread has been started and has not yet been stopped.

 In addition, Runnable provides the means for a class to be active while not subclassing Thread. A class that implements Runnable can run without subclassing Thread by instantiating a Thread instance and passing itself in as the target. In most cases, the Runnable interface should be used if you are only planning to override the run() method and no other Thread methods. This is important because classes should not be subclassed unless the programmer intends on modifying or enhancing the fundamental behavior of the class.

Callable - interfejs zawierający metodą call() ktura przetwarza wynik lub wyrzuca wyjątek. Runnable and Callable sa podobne pod kątek tego ze sa implementowane dla class gdzie istnieje ryzyko wywołania przez inny wątek

public interface Callable 

A task that returns a result and may throw an exception. Implementors define a single method with no arguments called call. 

The Callable interface is similar to Runnable, in that both are designed for classes whose instances are potentially executed by another thread. A Runnable, however, does not return a result and cannot throw a checked exception.

The Executors class contains utility methods to convert from other common forms to Callable classes.