Understanding of synchronized eight lock phenomenon

Eight locks are eight questions about locks

Premise A Method sleep 4 second B Method directly

synchronized

nothing static The lock is the caller of the method Who gets the lock first, who executes it first

Two Synchronized Who will execute first Who outputs ( The same object calls ）A First

One writes Sy A none Sy No effect Even if the same object calls B First

*static Static methods The lock is a class Even the object calls of two classes are An object calls A First

（ The same object ） One Static A none static What you got is not the same lock A class lock An object lock No effect B First, the output

（ Different objects ） One Static A none Static ditto It's not a lock B First

new Express this A specific mobile phone

static  The lock Class The only template