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immutability    
n. 不变,不变性

不变,不变性

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  • Initialization of an ArrayList in one line - Stack Overflow
    List<String> places = new ArrayList<>(List of("Buenos Aires", "Córdoba", "La Plata")); This new approach of Java 9 has many advantages over the previous ones: Space Efficiency Immutability Thread Safe See this post for more details -> What is the difference between List of and Arrays asList?
  • How to make an immutable object in Python? - Stack Overflow
    Although I have never needed this, it just struck me that making an immutable object in Python could be slightly tricky You can't just override __setattr__, because then you can't even set attribu
  • What is immutability and why should I worry about it?
    What is Immutability? Immutability is applied primarily to objects (strings, arrays, a custom Animal class) Typically, if there is an immutable version of a class, a mutable version is also available For instance, Objective-C and Cocoa define both an NSString class (immutable) and an NSMutableString class If an object is immutable, it can't be changed after it is created (basically read-only
  • oop - Mutable vs immutable objects - Stack Overflow
    Immutable Objects vs Immutable Collections One of the finer points in the debate over mutable vs immutable objects is the possibility of extending the concept of immutability to collections An immutable object is an object that often represents a single logical structure of data (for example an immutable string) When you have a reference to an immutable object, the contents of the object
  • immutability - Immutablity in Java - Stack Overflow
    Immutability is a good quality for objects (especially those where ownership can be an issue, or concurrency is) but the downside is you may construct a lot of throwaway objects and therefore they can be inefficient So it's a tradeoff and it depends what you need the objects for whether it is worth it
  • immutability - Why are record classes immutable by default, but record . . .
    Taken directly from a Microsoft MVP Engineer İlkay İlknur: Most of the generated code looks similar to the record classes However, there is one difference between record structs and record classes The generated properties in record structs are mutable by default The reason behind this decision was to be consistent with tuples Tuples are like anonymous record structs with similar features
  • immutability - Make immutable Java object - Stack Overflow
    My goal is to make a Java object immutable I have a class Student I coded it in the following way to achieve immutability: public final class Student { private String name; private String age;
  • immutability - What does immutable and readonly mean in C#? - Stack . . .
    The first part is Immutability in C# Part One: Kinds of Immutability Very informative and helpful, as always The series describes what does it mean for a variable to be readonly, immutable etc in details Generally, readonly means only that you can't re-assign a field outside the constructor
  • javascript - What does immutable mean? - Stack Overflow
    Immutability has big advantages, but sharing part or all of a data structure as an optimisation is perfectly possible with mutables Even if you want apparent immutability for other references, you can always copy-on-write as needed
  • java - Is Integer Immutable - Stack Overflow
    I know this is probably very stupid, but a lot of places claim that the Integer class in Java is immutable, yet the following code: Integer a=3; Integer b=3; a+=b; System out println(a); Executes





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