java - Get specific characters in a string -

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i have string can vary :

string filepath = "/this/is/my/file.txt";

i need string other strings information :

"/this/is/my" , "file.txt"

i tried method failed(crash) :

    int counter = 0;     filepath = "/this/is/my/file.txt";     string filepath2 = filepath.substring(filepath.lastindexof("/") + 1); // return "file.txt"     (int = 0; < filepath2.length(); i++) {         counter++; // count number of char on filepath2     }     string filepath3 = filepath3.substring(filepath.lastindexof("") + counter); // remove "file.txt" filepath2 depending of character numbers on filepath2 backwards

anyone know better method? thanks!

12-05 15:53:00.940  11102-11102/br.fwax.paulo.flasher e/androidruntime﹕ fatal exception: main     process: br.fwax.paulo.flasher, pid: 11102     java.lang.runtimeexception: unable start activity componentinfo{br.fwax.paulo.flasher/br.fwax.paulo.flasher.mflasher}: java.lang.stringindexoutofboundsexception: length=21; index=29

how java's file class?

file f = new file(filepath); string directory = f.getparent(); string filename = f.getname();

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