是否有一个类似于Python的“枚举”函数的Java ?

In Python, the enumerate function allows you to iterate over a sequence of (index, value) pairs. For example:

在Python中，枚举函数允许您迭代(索引、值)对的序列。例如:

>>> numbers = ["zero", "one", "two"]
>>> for i, s in enumerate(numbers):
...     print i, s
... 
0 zero
1 one
2 two

Is there any way of doing this in Java?

在Java中有什么方法吗?

10 个解决方案

#1

For collections that implement the List interface, you can call the listIterator() method to get a ListIterator. The iterator has (amongst others) two methods - nextIndex(), to get the index; and next(), to get the value (like other iterators).

对于实现列表接口的集合，您可以调用listIterator()方法来获得一个listIterator。迭代器(在其他方法中)有两个方法——nextIndex()，以获得索引;然后，获取值(像其他迭代器一样)。

So a Java equivalent of the Python above might be:

因此，上述Python的Java等效项可能是:

List<String> numbers = Arrays.asList("zero", "one", "two");
ListIterator<String> it = numbers.listIterator();
while (it.hasNext()) {
    System.out.println(it.nextIndex() + " " + it.next());
}

which, like the Python, outputs:

就像Python，输出:

0 zero
1 one
2 two

10 个解决方案

#1

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