java基础 callable

java.util.concurrent.Callable
Callable 跟 Runnable类似, 但前者可以有返回值,可以抛出异常
java.util.concurrent.Executors 类有一些方法能把其它形式转化为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.