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0728~面试题梳理
2022-07-29 01:53:00 【生活可真难啊】
说说jvm的垃圾回收算法?
标记清除算法:先把对象进行标记,然后再统一进行清除,就叫做标记清除算法;
标记整理算法:先把对象按内存地址值排序,先标记存活的对象,然后再按照内存地址值进行排序,清除未被标记到的;
标记复制算法:按内存实际容量划分为两个大小一样的空间,每次只使用一个,等这个使用完了,然后使用完后另外一个存活的对象复制到这一个上去,然后清除使用过的对象;
说说jvm垃圾回收机制?
哪些对象需要回收?被弃用的常量,没有被引用的对象;
什么时候回收?当类被弃用的时候;
如何回收?用引用计数法判断对象是否存活,再进行垃圾收集器;
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