1、相同点
两者都是接口
两者都需要调用Thread.start启动线程
2、不同点
callable的核心是call()方法,允许返回值,runnable的核心是run()方法,没有返回值
call()方法可以抛出异常,但是run()方法不行
callable和runnable都可以应用于executors,thread类只支持runnable
3、实例
Runnable和Callable的接口定义
@FunctionalInterface public interface Runnable { /** * When an object implementing interface <code>Runnable</code> is used * to create a thread, starting the thread causes the object's * <code>run</code> method to be called in that separately executing * thread. * <p> * The general contract of the method <code>run</code> is that it may * take any action whatsoever. * * @see java.lang.Thread#run() */ public abstract void run(); }
@FunctionalInterface public interface Callable<V> { /** * Computes a result, or throws an exception if unable to do so. * * @return computed result * @throws Exception if unable to compute a result */ V call() throws Exception; }
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