Why are strings immutable in many programming languages? [repeated] - why are strings immutable in many programming languages? [duplicate]

problem ：

Possible Duplicate: May repeat ：
Why can't strings be mutable in Java and .NET? Why is the string in Java and .NET Medium immutable ？
Why .NET String is immutable? Why? .NET String It's immutable ？

Several languages have chosen for this, such as C#, Java, and Python. Several languages have been selected for this purpose , for example C＃,Java and Python.If it is intended to save memory or gain efficiency for operations like compare , what effect does it have on concatenation and other modifying operations? If you are going to save memory or for something like compare And so on. Operation improves efficiency , So how does it affect concatenation and other modification operations ？

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Solution ：

Reference resources ： https://stackoom.com/en/question/e2sQ