加锁 同(tóng )时(shí )队列可以(yǐ )无(wú )限长吗 什么时候消减,同(tóng )时采(cǎi )用了弱引用避免(miǎn )队(duì )列过大,造(zào )成gc压(yā )力 源(yuán )码如下(xià )get recycle scavenge每次(cì )都是从(cóng )head节点获(huò )取,如(rú )果(guǒ )获取不到就(jiù )next,这些(xiē )队列并(bìng )不(bú )删除,jvm会(huì )自动在内存不(bú )够的时(shí )候删除(chú )
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