加锁 同时队(duì )列可以(yǐ )无限长吗 什么时候(hòu )消(xiāo )减,同(tóng )时(shí )采用了(le )弱(ruò )引用避(bì )免队列过大,造成gc压力 源(yuán )码如(rú )下get recycle scavenge每次都是(shì )从(cóng )head节(jiē )点获(huò )取,如果(guǒ )获取不到就(jiù )next,这(zhè )些队(duì )列并(bìng )不删除,jvm会(huì )自动在内存(cún )不够的(de )时候删除
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