strong, soft, weak, and virtual references to objectsin previous versions of JDK 1.2, if an object was not referenced by any variable, the program could no longer use the object. That is, only the object is in the accessible (reachable) state before
Oc memory management mechanism and oc Memory Management
I have always been familiar with the oc memory management mechanism. Today I read the official documentation to record it.
I am relatively lazy. I am posting official documents here.
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Related articlesJava Virtual Machine SeriesPrefaceIn this section we will briefly introduce the garbage collector, and learn the algorithm of garbage tagging: reference counting algorithm and Root search algorithm, in order to better understand the
From a freshman self-taught Java has been two years, conscious already can independently, (in fact, far less), has been reading recently. About Java four kinds of reference types, I also just understand, hereby note!
Four levels of references
The Swift memory management feature is handled by using automatic reference count (ARC). ARC is used to initialize and cancel initialization of the system resources, thereby releasing the memory space of the class instance used when the instance is
iOS app development: What is ARC?Blog Category:
Phone/ios/objective-c/Swift
What is arc?ARC is a new feature of iOS 5, called arc (Automatic Reference counting). Simply put, it is the code that automatically joins the Retain/release,
There are 4 levels of references in Java: strong references, soft references, weak references, and virtual References. In addition to strong references, the other 3 references can find the corresponding class in the Java.lang.ref package. Developers
I. Automatic reference counting 1. Automatic reference counting mechanism 1.1 swift and OC, use automatic reference counting to manage memory 1.2 when there is a strong reference to the object, the reference count of the object is +1, the
In the graphical interface programming, the first problem to solve is how to associate the static interface with the code, or how the code and the object on the interface
Communication, how the code operates on an object on the interface. On the
If an object in memory does not have any references, it means that the object is no longer in use and can be a candidate for garbage collection. However, the actual collection time of objects that can be garbage collected is indeterminate because
Strong referencesA reference to an object created by new in a generic program is a strong reference, and a strong reference can be reclaimed by the garbage collector only if it is unreachable from the root node, so a memory overflow may occur.Soft
There are 4 types of references in Java: Strongreference, SoftReference, WeakReference, and Phantomreference (the legendary Ghost quotes hehe),These 4 types of references are closely related to GC, so let's look at their definitions and usage
I believe we usually do Android applications, how much will be contacted to load pictures asynchronously, or load a large number of pictures of the problem, and load pictures we often encounter many problems, such as the image of the disorder, oom
In the UOP data cache I introduced the general principle of object caching, where the large object caching is simply
The basic principle is introduced. This article describes in detail how to cache large objects.
Based on the type of this column,
From a freshman self-taught Java has been two years, conscious already can independently, (in fact, far less), has been reading recently. About Java four kinds of reference types, I also just understand, hereby note!
Four levels of references
In the arc mode of OBJECTIVE-C, ID obj1 = [[NSObject alloc] init];Although there are no declarations shown as __strong, an object declared by default by Objective-c is __strong, which is:ID obj1 = [[NSObject alloc] init];AndID __strong obj1 =
From: http://blog.chinaunix.net/u3/90973/showart_2163813.html
SP and WP implementation process ~~I personally think SP and WP are actuallyAndroidAutomatically implemented for C ++JunkReclaimMechanismTo be specific to the internal implementation,
I. Java garbage collection mechanism
The Java garbage collector is responsible for completing three tasks:
1. allocate memory2. Ensure that the memory of the referenced object is not recycled incorrectly.3. Reclaim the memory space of objects that
IOS memory management mechanism and cyclic reference processing method, ios Memory Management
Brief Introduction
ARC: Automatic Reference count, Automatic Reference Counting
MRC: Mannul Reference Counting
How ARC works
1. Each time a new instance
Start the automatic reference counting option.Select the project's properties file--"Search automatic Reference--" Objective-c automatic Reference Counting--"YesThe difference between ARC and manual memory management.ARC is not the GC that
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