問題描述
在 Python 中，enumerate 函數(shù)允許您可以迭代一系列 (index, value) 對(duì).例如:
In Python, the enumerate function allows you to iterate over a sequence of (index, value) pairs. For example:
>>> numbers = ["zero", "one", "two"]
>>> for i, s in enumerate(numbers):
... print i, s
...
0 zero
1 one
2 two
在 Java 中有什么方法可以做到這一點(diǎn)嗎?
Is there any way of doing this in Java?
推薦答案
對(duì)于實(shí)現(xiàn) List接口，可以調(diào)用listIterator() 方法獲取 ListIterator.迭代器(除其他外)有兩種方法 - nextIndex()，獲取索引；和 next()，獲取值(與其他迭代器一樣).
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).
所以上面 Python 的 Java 等價(jià)物可能是:
So a Java equivalent of the Python above might be:
import java.util.ListIterator;
import java.util.List;
List<String> numbers = Arrays.asList("zero", "one", "two");
ListIterator<String> it = numbers.listIterator();
while (it.hasNext()) {
System.out.println(it.nextIndex() + " " + it.next());
}
與 Python 一樣，輸出:
which, like the Python, outputs:
0 zero
1 one
2 two
這篇關(guān)于是否有與 Python 的“枚舉"函數(shù)等效的 Java?的文章就介紹到這了，希望我們推薦的答案對(duì)大家有所幫助，也希望大家多多支持html5模板網(wǎng)！