immutable c#

Transfer from http://developer.51cto.com/art/201503/468905.htmThis article mainly introduces the immutable objects in Java, and the immutability of the string class in Java, so why is the Java String class immutable? Let's analyze it together.Answer one:One of the most popular Java surface questions is: What are immutable objects (

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 StringBuilder or StringBuffer. Flip through some of the online blogs and StackOverflow, comb

In a multithreaded environment, in order to ensure the consistency of shared data, it is often necessary to lock the use of shared data, but the lock operation itself brings some overhead, which can be used to encapsulate the shared data using immutable objects, thus avoiding the lock operation.1. Model RolesImmutable objects mean that there is no method within the object to modify the object data, and if any data for the shared variable needs to be m

Convention). If you go deep into the source and find that this property actually returns a Nsmutablearray, and then skips the API to use it directly, it will break the Convention, which is not a problem for the Class designer.Another problem is if you use this property inside a class. It is generally recommended that you also use property access within the class, rather than directly accessing the underlying instance variable (note: This may differ from the effective objective-

Immutable pattern "indestructible mode"One: Participants in the immutable pattern--->immutable (unchanging) participant1.1:immutable Contributor is a class that cannot change the value of a field.1.2:immutable also does not have any method to change the value of a field.The

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

Python immutable objects have been introduced in the Python object category, and examples are listed below for detailed analysis:Immutable Types (numbers, strings, tuples, immutable collections): Original modifications are not supported.Reference>>> a=345 >>> b=a is b True >>> In Python everything is an object, and the object is passed by reference. When assigning a value, whether the object is newly

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 immutable classes (1) Use privat

Immutable Object Design modeApplicable scenarios:1. The state of the modeled object changes infrequently: Set a dedicated thread to create a new immutable object when the state of the modeled object changes. Other threads simply read the state of the immutable object. A small trick in this scenario is that manipulator references to

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. In the basic class library of JDK 1.5, some

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 code creates a total of three Integer objects,