加锁 同时队列可以(yǐ )无限长吗(ma ) 什(shí )么时候(hòu )消减,同(tóng )时(shí )采用了弱引用(yòng )避免(miǎn )队(duì )列(liè )过大,造(zào )成gc压(yā )力 源(yuán )码(mǎ )如(rú )下get recycle scavenge每次都是从head节(jiē )点获取(qǔ ),如果(guǒ )获取(qǔ )不到就(jiù )next,这些队列(liè )并不(bú )删除(chú ),jvm会自动在(zài )内(nèi )存不够的时(shí )候删除
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