Comparing contents of a file with String[]

[eponcedeleon]

Hi,
I am trying to compare the contents of an array to what ever there is in a file...so that
if - whatever i have in array[i] is in file
DO SOMETHING
else
DO SOMETHING

as of now i take the first element of my array and check it agains my file, however, when i find a match in my file i dunno how to reset my Buffer reader to start reading from the top of the file again and to check the next element in my array...here is the code

FileInputStream fstream = new FileInputStream(pathOfDSKFile + "DSK_record.txt");
// Get the object of DataInputStream
DataInputStream in = new DataInputStream(fstream);
BufferedReader br = new BufferedReader(new InputStreamReader(in));
String strLine, str;
boolean a;
// Read File Line By Line
while ((strLine = br.readLine()) != null) {
	for (int i = 0; i < filesForBAT.length; i++) {
		do {
			str = filesForBAT[i].substring(0, (filesForBAT[i].length()) - 4);		//debugging
			//getting rid of the .txt at the end of the string and comparing to string in file
			a = filesForBAT[i].substring(0, (filesForBAT[i].length()) - 4).equals(strLine);		//debugging
			if (a == true) {
			// create SDK OR NOT
			System.out.println("SDK" + filesForBAT[i].substring(0, (filesForBAT[i].length()) - 4) + " was created already");
			//HERE IS WHERE I NEED TO RESET OR START READING AGAIN FROM THE BEGINNING OF THE FILE AND MOVE TO i = 1 in my for loop
			in.close();
			}
		} while ((strLine = br.readLine()) != null);	
	}//end of for
}//end of while

JUST SO U HAVE AN IDEA.....

Data in File ----------------- Data in filesForBAT[]
crs_SP2010 ......................... crs_SP2013.txt
usr_SP2010 ......................... usr_SP2013.txt
crs_SP2011
usr_SP2011
crs_SP2012
usr_SP2012
crs_SP2013
usr_SP2012

[FON]

You don't want to open and close File n times or to move through stream n times, how about converting File to String and work with String?

Each line you read from file can be appended to StringBuffer(or StringBuilder maybe it's lil faster),
add line feed after each, so you end up with String that represents a file.

Think about which loop to put in which and separate code for comparing in separate method and optimize it through some test with large files/arrays.

cheers

[JosAH]

Data in File ----------------- Data in filesForBAT[]
crs_SP2010 ......................... crs_SP2013.txt
usr_SP2010 ......................... usr_SP2013.txt
crs_SP2011
usr_SP2011
crs_SP2012
usr_SP2012
crs_SP2013
usr_SP2012

Put all the lines mentioned in the second column in a Set<String> (without the .txt suffix) and check each line from the file against that Set; if found do something, else do something else. That way you only have to read the file once.

kind regards,

Jos