一些很有意思的基本概念,大家进来讨论讨论!

强可达状态(强引用),

弱可达状态(软引用),

软可达状态(弱引用),

幻可达状态(幻引用).

那位仁兄能帮忙清楚地解释一下这些概念,最好能给出原码实例.

19 个解决方案

#1

我第一次听说这种概念
学习

#2

就是就是没听说过

#3

sun的官方文档里看到的,感觉能理解一点,但又不是很清晰,所以想请教一下各位大虾.

#4

是设计模式的概念吧

#5

牛

#6

不是设计模式,是对象的生存周期的一些概念.

#7

好象没有这样了概念吧，生存周期没见过啊。

#8

能提供英文原文么？好像这样子用中文的话不是很好理解

我的书上没有

#9

java.lang.ref

#10

niu

#11

state machine

#12

这好像是有限自动机理论中的概念，搂主在那里见到的？

#13

sun中国社区有一个视频将jvm内存管理的,讲的就是这些内容,只是我没怎么仔细看 :)
谁有兴趣自己去下来看看就是了.

#14

强。。。。。

#15

有点印象,但是没有研究过...也许自己认为目前还不需要!
所以,楼主问了这样的问题.那我就和你们一起学习吧

#16

Reference ?
PhantomReference ?
SoftReference ?
WeakReference ?

#17

原文是这样的;
strong reachable;
An object is strongly reachable if it can be reached by some thread without traversing any reference objects.a newly-created object is strongly reachable by the thread that created it.

soft reachable:
an object is softly reachable if it is not strongly reachable but can be reached by traversing a soft reference.

weak reachable:
an object is weakly reachable if it is neither strongly nor softly reachable but can be reached by traversing a weak reference.

phantom reachable;
an object is phantom reachable if it is neither strongly,softly nor weakly reahable,it has been finalized ,and some phantom reference refers to it.

#18

牛，学无止境

#19

Soft references are for implementing memory-sensitive caches, weak references are for implementing canonicalizing mappings that do not prevent their keys (or values) from being reclaimed, and phantom references are for scheduling pre-mortem cleanup actions in a more flexible way than is possible with the Java finalization mechanism.

#20

#1