strong reference

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. In other words, only the object is in a reachable state and the

Java GC and ghost referenceThere are four types of references in Java: strongreference, softreference, weakreference, and phantomreference ),These four types of references are closely related to GC. Let's look at their definitions and use cases one

Garbage Collection Part 2: Automatic Memory Management in the Microsoft. NET Framework   GC: Automatic Memory Management in. net framework   Jeffrey Richter   This document assumes that you are familiar with C and C ++ Summary: The first part of

    In the previous article, we analyzed the strong pointer sp in the Android smart pointer. In this article, we will analyze the weak pointer wp. Why do we need a weak pointer wp? Consider the following scenario: CParent and CChild. A smart pointer

There are four types of references in Java: strongreference, softreference, weakreference, and phantomreference,These four types of references are closely related to GC. Let's look at their definitions and use cases one by one: 1. Strong

First of all, I generally use the adapter is Baseadapter, of which two methods are the most important, namely: Getcount,getview, when the ListView is optimized, first use Convertview and viewholder mates to optimize, The use of Convertview is the

Preface a circular reference is when self owns a block, and the method of self is called in block. Form you have me, I have you, who can not release who the dilemma. or the solution in short, just one thing: __weak typeof (self) weakself = self;This

Java reference type When the blogger recently sorted out the Java Collection framework and sorted out WeakHashMap, he felt it necessary to elaborate on the Java reference type first. Therefore, I would like to give you more comments on this

Today, look at the code, there is a class java.lang.ref.SoftReference the younger brother to God, imagine, touch Java has been 3 years, wow, even lang package below the class are not understand, how to mix. Later on-line search information, feel a

There are several references in Java: Strong references, softreference,weakreference, and Phantomrefrence. Can be simply called: strong, soft, weak, virtual. The strength of the reference is decremented in turn. A strong reference means

  1. Strong, soft, weak, and virtual references of ObjectsIn versions earlier than JDK 1.2, if an object is not referenced by any variable, the program will no longer be able to use this object. That is, the program can use an object only when it is

We can not load the picture every time the user to download from the network, so that not only waste traffic and will affect the user experience, so Android introduced the image of the caching operation mechanism. Principle: First, according to

We usually use a strong reference to the object, and if a strong reference exists, the GC does not reclaim the object. Can we keep a reference to the object at the same time and let the GC recycle the object when it's needed? NET provides the

In Android development, picture processing is a difficult point. For a lot of picture processing, accidentally will appear oom error. Then, building the cache is a very necessary means. Building the cache with soft references is just one of the

This section describes the concepts, applications, and representations of strong, soft, weak, and virtual references of objects in UML.1. Strong, soft, weak, and virtual references of ObjectsIn versions earlier than JDK 1.2, if an object is not

The recent projects always experience memory overflow. This problem occurs when the project is large and you do not pay attention to it. As a result, the framework of the second version is rewritten. What is important is that the inheritance system

Ios, ios9 Swift syntax BASICS (II). If you want to learn swift, you can take it for reference. If you are interested, you can discuss and learn together. I. automatic Reference count 1. automatic reference counting mechanism 1.1 swift and oc use

definition: A circular reference can be simply understood as a reference to B, and B also refers to a, both sides maintain a reference at the same time, resulting in any time the reference count is not 0, always cannot be released; Three

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, and the code that originally needed to manually add a reference count to handle memory management can

Understanding weak references in Java Not long ago, I interviewed some candidates for senior Java development engineers. I often interview them and say, "Can you introduce me to some weak references in Java ?", If the subject says, "Well, is it