4、多线程有几种实现方法,都是什么?同步有几种实现方法,都是什么?

答：多线程有两种实现方法，分别是继承Thread类与实现Runnable接口

同步的实现方面有两种，分别是synchronized,wait与notify

-4, multi-threaded implementation has several methods, what is? Synchronization has several methods of implementation are what? A: There are two multi-threaded implementation methods are inherited separately achieve Thread Classes and the Runnable interface implementation aspects of synchronous There are two, respectively, are synchronized, wait and notify