String contains method return false even when string contains substring

Question

I have a string:

20160719_P_BID_20160718_130000

I need to check if this string contains the substring "BID". I have tried various methods like:

.contains("BID") / .contains("_BID_")
.indexOf("BID")
.substring(11,14).equals("BID)

but all methods have returned false even though the output of the strings does contain the string "BID" and is the string "BID"

Update:

String fileName = file.getFileName();
String tradeTypeStr = fileName.substring(11,14);        
if(tradeTypeStr.equalsIgnoreCase(tradeType))

Can someone shed some light as to why the methods are returning false?

Thanks for your help!

Show some more of your code please. I just ran "20160719_P_BID_20160718_130000".contains("BID") and the result is "true" — Dylan Meeus
– Dylan Meeus, Commented Jul 18, 2016 at 9:52
Have you tried copying the exact String and pasting into the code? — Kise
– Kise, Commented Jul 18, 2016 at 9:52
.contains method should works. Would you post the exact code you tested with? — hadilq
– hadilq, Commented Jul 18, 2016 at 9:54
You must print tradeTypeStr to see what is the value that you are comparing. — Gaurava Agarwal
– Gaurava Agarwal, Commented Jul 18, 2016 at 9:58

Dieter Bartmann · Accepted Answer · 2016-07-18 10:34:32Z

4

Since String.contains() and String.indexOf() definitely works, this sounds like you may have a problem with your encoding. Try

    String fileName = file.getName();
    for (char c : fileName.toCharArray())
    {
        System.out.println(c + " : " + Integer.toHexString(c));
    }

If you don't find something like

_ : 5f
B : 42
I : 49
D : 44
_ : 5f

you've got the reason for your problem

answered Jul 18, 2016 at 10:34

Dieter Bartmann

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1 Comment

user1889849 Over a year ago

Thank you! you've been most helpful!

hadilq · Accepted Answer · 2016-07-18 10:00:35Z

0

Test this

String fileName = file.getName();

if(fileName.contains(tradeTypeStr))

answered Jul 18, 2016 at 10:00

hadilq

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1 Comment

hadilq Over a year ago

Maybe you are changing your keyboard language when typing "BID"! Could you use copy and paste from debugging variable of fileName? It should work.

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