不同类型的琴弦 [英] Different types of Strings

问题描述

我们可以创建和初始化字符串为

We can create and initialise strings as

String str="Hello Friends";

或

OR

String str=new String("Hello Friends");

我想知道，两种初始化类型之间有什么区别.

I wanna know, what is the difference between both types of initialization.

推荐答案

答案在编译器中.

使用"创建字符串时，将创建一个字符串对象.这可以通过使用String扩展名来观察.

The answer is in the compiler.

When you create a string using "" a string object is made. This can be observed by using String extensions.

public static class StringExtended
{
   public static string CustomFormat(this string s, params object[] args)
      return string.Format(intput ?? string.Empty, args);
}

...

public void DoSomething()
{
    var formatted = "Hello World{0}".CustomFormat("!");

    //Same as
    var standardFormat = string.Format("Hello World{0}", "!");
}

同样，您可以执行5.ToString()之类的操作，因为5的类型为Int32.

Similarly you can do stuff like 5.ToString() since 5 is of type Int32.

没什么.前者只是缩写形式，因为字符串很常见，因此被编译器接受.

Nothing. The former is just an abbreviated form accepted by the compiler as strings are so common.

此处第一个像变量一样使用，而另一个像使用构造函数初始化String的类一样使用.我想知道，为什么会这样呢?第一种情况是如何在后台运行的.请解释答案.

here first one is used like a variable while other like a class which is using constructor for initialising the String. I wanna know, why is it so? How the first case is working at background. please explain the answer.

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