加锁 同(tóng )时队列可以无限(xiàn )长吗 什(shí )么时候消(xiāo )减,同时(shí )采(cǎi )用了弱(ruò )引用(yòng )避免队(duì )列(liè )过大,造(zào )成gc压力 源码(mǎ )如下get recycle scavenge每次都是从(cóng )head节点(diǎn )获(huò )取,如果(guǒ )获取不到(dào )就next,这些队列并不(bú )删除(chú ),jvm会自动(dòng )在内存(cún )不(bú )够(gòu )的时(shí )候(hòu )删除(chú )
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