正在使用int +“"将Java int转换为String不好吗? [英] Is using int + "" bad for converting Java int's to Strings?

问题描述

因此，我们的计算机科学老师教我们如何通过以下方法将int转换为String:

So our computer science teacher taught us how to convert ints to Strings by doing this:

int i=0;
String s = i+"";

我想他是通过这种方式教给我们的，因为这是相对基础的计算机科学(请上高中班，请注意)，但是我想知道与以下内容相比，它是否在某种程度上是不好的":

I guess he taught it to us this way since this was relatively basic computer science (high school class, mind you), but I was wondering if this was in some way "bad" when compared to:

int i=0;
String s = Integer.toString(i);

更昂贵吗?不良习惯?预先感谢.

Is it more costly? Poor habit? Thanks in advance.

推荐答案

理论上

说明

String s = i + "";

执行以下操作:通过调用Integer.toString(i)将i转换为String，并将此字符串连接为空字符串.这将导致创建三个String对象和一个串联.

does the following: convert i to String by calling Integer.toString(i), and concatenates this string to the empty string. This causes the creation of three String objects, and one concatenation.

说明

String s = Integer.toString(i);

执行转换，仅执行转换.

does the conversion, and only the conversion.

大多数JIT编译器能够将第一条语句优化为第二条语句.如果此优化甚至在以前完成(通过javac编译器，将Java源代码编译为字节码)，我也不会感到惊讶.

Most JIT compilers are able to optimise the first statement to the second one. I wouldn't be surprised if this optimisation is done even before (by the javac compiler, at compilation of your Java source to bytecode)

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