V - 方法的结果类型
call
@FunctionalInterface public interface Callable<V>
call 。
Callable接口类似于Runnable ,因为它们都是为其实例可能由另一个线程执行的类设计的。 然而,A Runnable不返回结果,也不能抛出被检查的异常。
该Executors类包含的实用方法,从其他普通形式转换为Callable类。
Executor
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