Java:在列表中找到字符串的索引 [英] Java: Find the index of a String in a list

问题描述

我有一个列表:

public static  List<String> codes = new LinkedList<String>(Arrays.asList(
            "Zero",
            "One"
            )); //Etc..

我希望能够在键入String时找到其位置编号.例如，如果我键入One，我希望程序打印出1.目前，我只能使用codes.get();

I want to be able to find the number of a String's position when I type it. For instance, if I type One, I want the program to print out 1. Currently, I can only do the reverse by using codes.get();

更正:我希望程序打印出String在列表中的位置. Zero的位置为0，如果我执行codes.get(0);，则得到Zero.但是，我该如何做相反的事情?

Correction: I want the program to print out the position of the String in the list. Zero has the position 0, if I do codes.get(0); I get Zero. But how do I do the reverse?

有没有一种方法可以顺利地做到这一点?预先感谢.

Is there a way to smoothly do this? Thanks in advance.

推荐答案

codes.get()的相反之处是

The reverse of codes.get() is indexOf(Object obj) method

返回指定元素在此列表中首次出现的索引；如果此列表不包含该元素，则返回-1.

Returns the index of the first occurrence of the specified element in this list, or -1 if this list does not contain the element.

codes.indexOf("One");

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