Java 中增强for循环和普通for循环的区别

普通for遍历和增强for的一些区别

增强的for循环的底层使用迭代器来实现，所以它就与普通for循环有一些差异

1. 增强for使用增强for循环的时候不能使用集合删除集合中的元素；
2. 增强for循环不能使用迭代器中的方法，例如remove()方法删除元素；
3. 与普通for循环的区别：增强For循环有遍历对象，普通for循环没有遍历对象;

对于实现了RandomAccess接口的集合类，推荐使用普通for，这种方式faster than Iterator.next

The RandomAccess interface identifies that a particular java.util.List implementation has fast random access. (A more accurate name for the interface would have been "FastRandomAccess.") This interface tries to define an imprecise concept: what exactly is fast? The documentation provides a simple guide: if repeated access using the List.get( ) method is faster than repeated access using the Iterator.next( ) method, then the List has fast random access. The two types of access are shown in the following code examples.

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