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sirdaiz
Asked: 2020-03-09 03:53:23 +0800 CST 2020-03-09 03:53:23 +0800 CST

Find position in an array

  • 772

Suppose I have the following array:

List<String> list = ["Pepe","Paco","Lucas","Lucia","Stack"]

and I want to know the position that "Lucas" is in, which would be position 2, but I don't want to do it with a for since if it is an array of 1000 elements it is a lot, is there any way to locate it more optimally?

java

1 Answers

  1. Best Answer

    The function indexOf(String)returns us the position, in a int.

    • If there were multiple occurrences of the element, it would return the first one.

    • If the Stringdoes not exist, a -1.

    Another similar function is lastIndexOf(). It would work the same, except that in the case of multiple occurrences, it would return the index of the last match.

    In your code it would be:

    List<String> list = ["Pepe","Paco","Lucas","Lucia","Stack"]
int indiceLucas =  list.indexOf("Lucas"); // => 2
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