How is ReentrantLock designated as a fair lock

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The default synchronized is an unfair lock. Multiple threads access the same resource, and one of them gets the lock. Wait a second and wait a day, maybe the next second or wait a second to get the lock first. )

Fair lock: it is the one who waits for a long time to get the lock. Fair lock efficiency is relatively low, but more fair. Unfair lock is more efficient, but unfair.

Public class ReentrantLock5 extends Thread {private static ReentrantLock lock=new ReentrantLock (true); / / parameter true indicates fair lock. Compare the output result public void run () {for (int iLock 0; I)