string question

[cajchris]

if for example i have the following file name:

232323231_test_file.txt

but only want to get test_file.txt back how can i make sure that when i get to the first instance of the '_' character i take whatever is after it and return it.

regards,
cajchris

 

[Diancecht]

Inside the String class:

- indexOf will give you the first ocurrence inside the string.

- substring will return the piece of that string after a given position.

Cheers,
Dian

 

[LFI]

More on String commands at:

http://java.sun.com/j2se/1.4.2/docs/api/java/lang/String.html

More on Java commands at:

http://java.sun.com/j2se/1.4.2/docs/api/

You might also find the length property of Strings helpful. stringVariable.length returns the int length of stringVariable (NOTE: this value is one greater than the index of the last character in the String, making it a frequently good choice for use with the second parameter of the substring method).

Dave


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[wangdong]

Only if the number part is fixed length, then you can use position to get a substring.

You can use a loop to get the first '_' position.

Char ch = '_'

for(int i=0;i<filename.length();i++){
   if(filename.charAt(i) == ch){
      return filename.subString(i);
   }
}

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[wangdong]

sorry missing a ';' at the first line.

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[stefanwagner]

use regexp:

return filename.replaceAll ("[^_]*_", "_");

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[sedj]

Seeing as everyone is wading in with examples now ...

return filename.substring(filename.indexOf("_") +1, filename.length());

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[LFI]

sedj silently pointed out a flaw in my mention of the length property in that it is not a property, but a method. Arrays have a length property.

String myArray[] = new String[5];
String myString = "12345";
boolean myBool = (myArray[b].length[/b] == myString[b].length()[/b]); //true

Sorry about any confusion.

Dave


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
O Time, Strength, Cash, and Patience!