“final int i”是怎样的？在Java for循环中工作？ [英] How does "final int i" work inside of a Java for loop?

问题描述

我很惊讶地看到以下Java代码片段已编译并运行：

I was surprised to see that the following Java code snippet compiled and ran:

for(final int i : listOfNumbers) {
     System.out.println(i);
}

其中listOfNumbers是一个整数数组。

where listOfNumbers is an array of integers.

我认为最终声明只分配了一次。编译器是否创建了一个Integer对象并更改了它引用的内容？

I thought final declarations got assigned only once. Is the compiler creating an Integer object and changing what it references?

推荐答案

想象一下，速记看起来很像这样：

Imagine that shorthand looks a lot like this:

for (Iterator<Integer> iter = listOfNumbers.iterator(); iter.hasNext(); )
{
    final int i = iter.next();
    {
        System.out.println(i);
    }
}

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