CODEWITHSUNDEEP
javarandomaccessfile
Branbron
Branbron

Reputation: 101

Reading From RandomAccessFile

I am reading 10 lines from a simple RandomAccessFile and printing each line. The exact lines in the text file are as follows one after the other:

blue

green

bubble

cheese

bagel

zipper

candy

whale

monkey

chart

When printing them in order as I read line by line my output is this:

green

cheese

zipper

whale

chart

I cannot understand why my method is skipping every other line in the file. Am I misunderstanding how a RandomAccessFile works? My method is below:

RandomAccessFile file = new RandomAccessFile(FILEPATH, "rw");
    read(file);

public static void read(RandomAccessFile t) throws IOException{
    while (t.readLine()!=null) {
        System.out.println(t.readLine());
    }
}

Upvotes: 2

Views: 4773

Answers (3)

Rahul Verma
Rahul Verma

Reputation: 1

While using RandomAccessFile you could read at any seek position too rather than going line by line for optimized I/O performance.

RandomAccessFile raf = new RandomAccessFile("file","r");

raf.seek(info.getStartingIndex());//Maintain info while serializing obj
byte[] bytes = new byte[info.getRecordLength()];//length stored earlier similarly 
raf.read(bytes);
ByteArrayInputStream bis = new ByteArrayInputStream(bytes);
ObjectInputStream ois = new ObjectInputStream(bis);
obj = ois.readObject();

Upvotes: 0

Dipen Adroja
Dipen Adroja

Reputation: 425

Try this:

   String line = null;
    while ((line = br.readLine()) != null) {
    System.out.println(line);
    }

Every time you call readlin() it goes to next line that is why you are getting only even lines printed.

Upvotes: 2

gtgaxiola
gtgaxiola

Reputation: 9331

You are calling readLine() twice

while (t.readLine()!=null) {
    System.out.println(t.readLine());
}

Instead precompute the readLine();

String tmp;
while((tmp = t.readLine()) != null) {
    System.out.println(tmp);
}

Upvotes: 6

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