immutable class c#

Introduction of Immutable Class Immutable class: The so-called immutable class means that once the instance of this class has been created, it cannot change its member variable values.

Recently asked why the string was designed to be immutable, then a little confused, the problem has always been like a bug, unexpectedly did not find, did not think, summed up in this.The 1.String is immutableThe string class is final decorated and is not inheritable or modified . When a string variable is assigned a second time, instead of modifying the data at the original memory address, it re- opens a m

Immutable classes: When an instance of this class is created, the value of its member variable cannot beAdvantages:1. The value of the thread-safe object cannot be changed, reducing the likelihood of concurrency errors2. High efficiency when an object needs to be replicated, it only needs to copy the address of the object, without copying the nativeInvariance, which guarantees the uniqueness of the hashcode

Immutable class (immutable) means that the field of the instance is immutable after the instance is created for the mine. 8 Java-supplied wrapper classes and Java.lang.String classes are immutable classes If you need to create your own custom

()); System.out.println ("B:" +b.getdetail () +b.getpostcode () +B.hashcode ()); System.out.println (A.equals (b));}}Results:Cause Analysis:inFinalthe declared method does not allow overwriting, nor does it allow changes, so using final,we can devise a special kind of"Read-only"of the"Immutable Classes". Create"Immutable Classes"Object , the properties of this object cannot be changed .and you cannot deriv

1. PrefaceRecently, I've seen several interesting questions about the Java Core class string. The string class is how to implement its immutable attributes, and the benefits of being designed to be immutable. Why is it not recommended to use the + sign to form a new string, it is recommended to use StringB

Answer one: One of the most popular Java face questions is: What are immutable objects (immutable object), what are the benefits of immutable objects, what should be used, or more specifically, why should Java string classes be set to immutable types?Immutable objects, as t

Explore the immutable data types of c, Reading directory:Immutable object Immutable: once an object is created and initialized, its values cannot be changed, and a new object will be generated for each subsequent change. var str="mushroomsir";str.Substring(0, 6) The string in c # is

mutable classes: After an instance of a class is created, you can also modify the contents of the instance.For example, to create a 3*3 matrix, if Set function is set, you can change the size of the corresponding position element with set in main.Immutable classes: When an instance of a class is established, the State does not change and the member variable cannot be changed.That is,

The status of an instance of an unchangeable class does not change. Such an instance can be securely shared by other associated objects and securely shared by multiple threads. To save memory space and optimize program performance, you should try to reuse instances of immutable classes to avoid repeated creation of immutable classes with the same attribute value.

valueOf (int i) method of the integer class, respectively : I nteger a=new i nteger (10); I nteger b=new i nteger (10); I nteger c=i Nteger. valueOf (10); I nteger d= i nteger. valueOf (10); System.out.println (A==B); Print False System.out.println (A==C); Print False System.out.println (C==d); Print True The above co

Tag: Address design operation cannot data access style serial RACHere, the immutable string is no longer discussed, just to say why the string is immutable.Rough point, straight to the, string of the immutable reason there are three:1). The String class is finalA class with a final decoration cannot be inherited, and i

Disclaimer: this blog is an original blog and cannot be reproduced without permission! If you see it in other places, it is recommended to take a look at csdn (the original link for the http://blog.csdn.net/bettarwang/article/details/26744661), read the code and ask questions, discussion is more convenient. In Java, final is mainly used in three aspects: Variable modification, modification method and modification class. The role of final is explained

Java saves a string pool at run time, which makes string a special class.The benefits of the non-variability of the string class(1) A string pool is possible only if the string is immutable. The implementation of a string pool can save a lot of heap space at run time, because different string variables point to the same string in the pool. But if the string is mutable, then string interning will not be impl

The first thing to use is collections. unmodifiable xxx () this function See the following code for the rest.It is said that this function has a bug, and then out of guava1ImportJava.util.Collection;2ImportJava.util.Collections;3 ImportJava.util.HashSet;4ImportJava.util.Set;567 PublicclassGuava {8 PublicStatic voidMain (string[] args) {9SetNewHashsetTenSet.add ("Hello"); OneSet.add ("Insert"); ASet -SYSTEM.OUT.PRINTLN (set); - the} - }How to use the immutabl