解釋?zhuān)?br /> 這里的this是指當(dāng)前對(duì)象,也就是說(shuō)不管ta還是tb,剛開(kāi)始運(yùn)行這段代碼的時(shí)候會(huì)給這段代碼加個(gè)鎖,這樣即使運(yùn)行到中間被替換了,
另一個(gè)線(xiàn)程也不會(huì)執(zhí)行這段代碼,因?yàn)檫@段代碼加鎖了,而鑰匙在給代碼加鎖的那個(gè)線(xiàn)程手里,只有加鎖的線(xiàn)程運(yùn)行完這段代碼,才會(huì)給代碼解鎖.
然后其他線(xiàn)程才能執(zhí)行這段代碼.. 加個(gè)synchronized(this)以后運(yùn)行結(jié)果是這樣:
A synchronized loop 0
A synchronized loop 1
A synchronized loop 2
A synchronized loop 3
A synchronized loop 4
B synchronized loop 0
B synchronized loop 1
B synchronized loop 2
B synchronized loop 3
B synchronized loop 4
不加的話(huà)是這樣:(順序亂了,有好多種結(jié)果,這里只是其中一種)..
A synchronized loop 0
B synchronized loop 0
A synchronized loop 1
B synchronized loop 1
A synchronized loop 2
B synchronized loop 2
A synchronized loop 3
B synchronized loop 3
B synchronized loop 4
A synchronized loop 4