介绍 Thread.currentThread() 和 this（这个this等价于ThreadBasis的实例类，且其继承了Thread类） 的区别
线程暂停与恢复的方法学习，以及其缺陷了解
该方法使得当前线程放弃当前 CPU 资源，让给其他的任务去使用CPU。但有可能刚刚放弃，又获得 CPU 时间片了。
线程优先级的继承性：在Java中，如在A线程中创建B线程，则B线程和A线程的优先级是一样的。
"守护"具有陪伴的含义。因此，当进程中的非守护线程都消失时，守护线程将会自动销毁。垃圾回收线程就是典型的守护线程
该示例说明了：实例对象的锁和Class锁不是同一个。因此，不会得到同步的结果。
该示例说明了：Class锁可以对该类的所有实例对象起作用
验证 volatile 关键字在多线程中对可见性的影响
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