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加锁 同时(shí )队列可以无(wú )限(xiàn )长吗(ma ) 什(shí )么时(shí )候消减(jiǎn ),同时(shí )采(cǎi )用了弱引用避免队列过(guò )大,造(zào )成gc压力(lì ) 源(yuán )码如下get recycle scavenge每次都(dōu )是从head节点(diǎn )获(huò )取,如(rú )果获(huò )取(qǔ )不到就next,这些队(duì )列并不删除(chú ),jvm会(huì )自动在内存不够的时候(hòu )删除

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