To summarize: use the enhanced for loop by default, but consider a hand-written counted loop for performance-critical ArrayList iteration.
结论：优先采用改进for循环，但在性能要求苛刻的ArrayList迭代中，考虑采用手写计数循环。
The enhanced for loop (also sometimes known as "for-each" loop) can be used for collections that implement the Iterable interface and for arrays.
改进for循环(有时被称为“for - each”循环)能够用于实现了iterable接口的集合类及数组中。
The enhanced for loop, sometimes called the for-each loop, is translated by the compiler as if the programmer had supplied the equivalent old-style for loop.
增强的for循环有时叫做for - each循环，编译器编译它的时候，情形与程序员提供旧式for循环一样。
Some of the most interesting changes, such as the enhanced for loop, are basically just syntax changes that provide a shortcut for expressing a programming operation.
一些最有趣的更改，比如增强的for循环，基本上只是语法更改，即为表示编程操作提供快捷方式。
The main method USES an enhanced for loop to iterate through the different primitives and a simple switch statement on the current instance to set the size value of each primitive.
main方法使用增强的for循环来迭代通过不同的原语，并在当前实例上使用一个简单的switch语句来设置每个原语的大小值。
Note that I used an old-fashioned explicit int loop, rather than the more convenient for (int i : integers) enhanced for loop, because it is slightly faster, even for arrays (see Resources).
注意，我使用的是一个老式的显式int循环，而不是更方便的for (inti :integers) 改进型 for 循环，因为它的速度快一点儿（参见 参考资料）。
Most of the time, we just slap Iterator inside a for() loop or enhanced for() loop and move on, so to speak.
可以这么说，大部分时间我们只是将Iterator 随意放到for()循环或加强 for() 循环中，然后就继续其他操作了。
Pyrex's enhanced for probably speeds it up slightly, but the whole function is mainly the loop.
虽然pyrex改进后的for循环可能有一点加速，但是整个函数主要是一个循环。
Pyrex's enhanced for probably speeds it up slightly, but the whole function is mainly the loop.
虽然pyrex改进后的for循环可能有一点加速，但是整个函数主要是一个循环。
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