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线程是先创建好，还是有任务的时候再创建？

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线程是先创建好，还是有任务的时候再创建？

例如有不确定数量的用户输入任务，需要线程池去消费。
那是等待有用户输入10个任务，再创建线程池消费。还是先创建好线程池，然后监控任务队列？


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不确定数据量的任务,一般都用线程池,免得一下子搞出太多线程给整挂了..


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