加锁 同时(shí )队列可(kě )以(yǐ )无限长吗 什么时候消减,同时采(cǎi )用了弱引用避免队(duì )列(liè )过大,造成gc压力 源码如(rú )下get recycle scavenge每次(cì )都(dōu )是从head节点(diǎn )获(huò )取(qǔ ),如(rú )果获(huò )取不到(dào )就next,这些队列并(bìng )不删(shān )除(chú ),jvm会(huì )自动(dòng )在(zài )内存不够的时候删(shān )除
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