BufferedReader's readLine() method problem.

Question

Hello,
If anyone can help me out I would not have to struggle :)
Here is the thing. I have a file like this:
1     srjetnuaazcebsqfbzerhxfbdfcbxyvihswlygzsfvjleengcftwvxcjriwdohjisnzppipiwpnniuiyjpeppaezftgjfviwxunu
2     ekjghqflatrcdteurofahxoiyvrwhvaxjgcuvkkpondsqhedxylxyjizflfbgusoizogbffgwnswohenjixwufcdlbjlkoqevqdy
3     stfhcbslgcrywwrgbsqdkcxfbizvniyookceonscwugixgrxvvkxiqezltsiwhhepqusjdlkhadvkzgiefgarenbxnxtxnqdqpfh
4     dcuefkdrkoovjwdrqbpgoirruutphuiobqweknxhboyktxzcczgekrlbfsbfuygjpheydiwaasxifphtldawxsfepotkgqqsivur
5     fpfrspbuhangkeugfuwexsgivetovkoyloddgofdcajwwlrocgjrhonsrfrfxozvgohwoytycfjoycrxdhnhxyitkeqynedrbroh
6     hgzqqsfgnotfepywbpccrosxborslqtkanyffrwknjapnzjnesjlkbbsckbyvgrxujqyocpcpctsqyzapcinhjyysxsdwfjugndr
7     pltzealtrklzrugxdcskndqyvsrzncitqvjcnndeqossyrifzvbqovtdzsixjlizsbxwutgqipuxfidxyoktwupsuqbqgnxdfbze
8     avpxfjgwpxnzfsfosgsryhpyaezigrqsxsgdvwdbwovhcchrijbitvbcvltrgvadogokaennwpjjpkuuttidlnqftdnzqpqafels
9     oyvztgletdwdtibshpzeuqryvulnubrqtgxwizfsdzqlgxvsebhslnovphgehfigbjyyqsirqcwflbnbnrflotpqytqzbgnkeyrk
10     unvryrnlqucuydrasyzyiclnjvospzdoviqchdhasxzffblwsewikzbznyegrqtjvxfxfjenvrboofbxfsynlxhyuvqprqbvoruk
and my java programs is like this:
public String searchForAString(String fileName, int lineNumber)
File fileObject = new File(fileName);
String finalString ="";
String record = "";
int line;
try
FileInputStream fileInputStreamObject = new FileInputStream(fileObject);
BufferedInputStream bufferedInputStreamObject = new BufferedInputStream(fileInputStreamObject);
//DataInputStream dataInputStreamObject = new DataInputStream(bufferedInputStreamObject);
BufferedReader bufferedReaderObject = new BufferedReader(new InputStreamReader(bufferedInputStreamObject));
//System.out.println(bufferedReaderObject.readLine());
//System.out.println("_____________________");
while((bufferedReaderObject.readLine()) != null)
System.out.println(bufferedReaderObject.readLine());
Last System.out.println statement only displays second, forth, sixth, eigth, tenth and null lines. Why not every line? Any ideas? Thanks!

Answer 1

You do relize that when you call the in.readLine()in
your loop conditional and in your loop body itreads
in diffrent lines. Try this:
public String searchForAString(String fileName,int
lineNumber)
File fileObject = new File(fileName);
String finalString ="";
String record = "";
int line;
try
FileInputStream fileInputStreamObject = new
FileInputStream(fileObject);
BufferedInputStream bufferedInputStreamObject =new
BufferedInputStream(fileInputStreamObject);
//DataInputStream dataInputStreamObject = new
DataInputStream(bufferedInputStreamObject);
BufferedReader bufferedReaderObject = new
BufferedReader(new
InputStreamReader(bufferedInputStreamObject));
//System.out.println(bufferedReaderObject.readLine());
//System.out.println("_____________________");
String s = bufferedReaderObject.readLine();
while(s != null)
System.out.println(bufferedReaderObject.readLine());
s = bufferedReaderObject.readLine();
Every time you call the readLine method, it doesread
a diffrent line. Java does not know you want toread
the same line twice.Err, shouldn't that be:
while(s != null)
System.out.println(s);
s = bufferedReaderObject.readLine();
Otherwise, you're still discarding a line if you use
two readLines in the while loop.yes you are correct... srry late last night and I wsa copying his code :).