Using String.endswith() method on Java

Question

I have an array I want to check the the last digits if it is in the array.

Example:

String[] types = {".png",".jpg",".gif"}

String image = "beauty.jpg";
// Note that this is wrong. The parameter required is a string not an array.
Boolean true = image.endswith(types);

Please note: I know I can check each individual item using a for loop.

I want to know if there is a more efficient way of doing this. Reason being is that image string is already on a loop on a constant change.

Are you really attempting to name a boolean "true"? Or is that for some demonstration purposes? — BlackVegetable
– BlackVegetable, Commented Jun 19, 2012 at 18:06
@GearsdfGearsdfas true is a reserved keyword by Java. And it's just not a very good variable name anyway- not very descriptive. — David B
– David B, Commented Jun 19, 2012 at 18:12
oh LOL i wasn't thinking of using true it just happened. @DavidB — Gearsdf Gearsdfas
– Gearsdf Gearsdfas, Commented Jun 19, 2012 at 18:20

Nathan Hughes · Accepted Answer · 2012-06-19 18:05:41Z

14

Arrays.asList(types).contains(image.substring(image.lastIndexOf('.') + 1))

answered Jun 19, 2012 at 18:05

Nathan Hughes

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1 Comment

David B Over a year ago

Even simpler than mine. :) Does asList actually convert the array to a list every time?

David B · Accepted Answer · 2012-06-19 18:05:19Z

5

You can substring the last 4 characters:

String ext = image.substring(image.length - 4, image.length);

and then use a HashMap or some other search implementation to see if it is in your list of approved file extensions.

if(fileExtensionMap.containsKey(ext)) {

answered Jun 19, 2012 at 18:05

David B

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Comments

kjp · Accepted Answer · 2012-06-19 18:11:24Z

0

Use Arrays.asList to convert to a List. Then you can check for membership.

String[] types = {".png",".jpg",".gif"};
String image = "beauty.jpg";
if (image.contains(".")) 
    System.out.println(Arrays.asList(types).contains(
        image.substring(image.lastIndexOf('.'), image.length())));

answered Jun 19, 2012 at 18:11

kjp

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