“Object[] x"和“Object[] x"之间有什么区别吗?和“对象 x[]"? [英] Is there any difference between "Object[] x" and "Object x[]"?

问题描述

我正在用 Java 更新遗留代码库，我发现这样一行:

Object arg[] = { new Integer(20), new Integer(22) };

那行引起了我的注意，因为我已经习惯了这种代码:

Object[] arg = { new Integer(20), new Integer(22) };

数组的内容在这里并不重要.我很好奇变量名旁边的括号与类名旁边的括号.我在 Eclipse(使用 Java 5)中尝试过，这两行都对编译器有效.

这些声明之间有什么区别吗?

解决方案

两者都是合法的，并且都有效.但建议将 [] 放在数组名称之前.

来自 Javadocs:

<块引用>

您也可以将方括号放在数组名称之后:

float anArrayOfFloats[];//这种形式是不鼓励的

<块引用>

然而，惯例不鼓励这种形式；括号标识数组类型，并应与类型名称一起出现.

I was updating a legacy code base in Java and I found a line like this:

Object arg[] = { new Integer(20), new Integer(22) };

That line catched my attention because I am used to this kind of code:

Object[] arg = { new Integer(20), new Integer(22) };

The content of the array isn't important here. I'm curious about the brackets next to the variable name versus the brackets next to the class name. I tried in Eclipse (with Java 5) and both lines are valid for the compiler.

Is there any difference between those declarations?

解决方案

Both are legal and both work. But placing [] before the array's name is recommended.

From Javadocs:

You can also place the square brackets after the array's name:

float anArrayOfFloats[]; // this form is discouraged

However, convention discourages this form; the brackets identify the array type and should appear with the type designation.

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