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前面学习了怎么判别要回收的对象，以及垃圾回收的一些方式、标记-清除算法、标记-复制算法、标记-整理算法。现在看看我们每天使用的HotSpot虚拟机中算法的细节实现。
根节点枚举前面已经学习到可作为GC Roots的一些变量或者属性，但是实际上在查找过程中要做到高效也是很困难的，要逐个检查以这里为起源
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垃圾回收算法可分为2类： * 引用计数式垃圾收集（直接垃圾收集） * 追踪式垃圾收集（间接垃圾收集）
java主流的虚拟机都是采用追踪式垃圾收集的方式，我们主要学习这个。
分代收集
弱分代假说：绝大部分对象都是朝生夕灭的
强分代假说：熬过越多次垃圾收集过程的对象就越难消亡
跨代引用假说：
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复习前面有提到jvm的内存模型，我们知道，程序计数器、虚拟机栈和本地方法栈是和线程同生共死的，每个栈帧的大小在类结构确定下来之后就都是已知的。因此这几个区域的内存分配和回收都是有确定性的。
然而，java堆和方法区却有着显著的不确定性。只有程序在运行期间，我们才知道具体要创建哪些对象，创建多少对象，
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今天是520，不管有没有对象，都要学习呀
在我们经常使用的HotSpot虚拟机中，对象在堆内存中的布局可以分为3个部分：
对象头
实例数据
对齐填充
对象头对象的对象头包含2类信息：
用于存储对象自身的运行时数据如哈希码、GC分代年龄、锁状态标志、线程持有的锁、偏向线程的id、偏向时间戳等。这些
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