Reading Numbers from a Text File, Line by Line : File Reader « File Input Output « Java

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Java » File Input Output » File ReaderScreenshots 
Reading Numbers from a Text File, Line by Line
   

import java.io.FileReader;
import java.io.IOException;
import java.io.LineNumberReader;
import java.io.StreamTokenizer;

public class SumLine {
  
  public static void main(String[] a)throws IOException {
      sumLines("file.txt");
  }
  static void sumLines(String filenamethrows IOException {
    LineNumberReader lnr = new LineNumberReader(new FileReader(filename));
    lnr.setLineNumber(1);
    StreamTokenizer stok = new StreamTokenizer(lnr);
    stok.parseNumbers();
    stok.eolIsSignificant(true);
    stok.nextToken();
    while (stok.ttype != StreamTokenizer.TT_EOF) {
      int lineno = lnr.getLineNumber();
      double sum = 0;
      while (stok.ttype != StreamTokenizer.TT_EOL) {
        if (stok.ttype == StreamTokenizer.TT_NUMBER)
          sum += stok.nval;
        stok.nextToken();
      }
      System.out.println("Sum of line " + lineno + " is " + sum);
      stok.nextToken();
    }
  }
}
           
         
    
    
  
Related examples in the same category
1. Use a FileReader to display a text file.
2. Read the file one buffer at a time
3. Read file upside down
4. Loading text from a file
5. Reading Numbers from a Text File
6. Indent - prepend leading spaces
7. Read a file and print, using BufferedReader and System.out
8. Open File By Name
9. Read a file containing an offset, and a String at that offset
10. Testing for end of file while reading a byte at a timeTesting for end of file while reading a byte at a time
11. File LockingFile Locking
12. Getting channels from streams
13. A word counting utility with FileReader.
14. Reads sequentially from multiple sources
15. Reader for UCS-2 and UCS-4 encodings. (i.e., encodings from ISO-10646-UCS-(2|4)).
16. Reader for the ISO-8859-1 encoding.
17. This class is an part implementation of DataInput. It wraps a Reader object.
18. A StraightStreamReader is a bridge from byte streams to character streams
19. Read and return the entire contents of the supplied Reader. This method always closes the reader when finished reading.
20. Compare the contents of two Readers to determine if they are equal or not.
21. Read from Reader and write to Writer until there is no more input from reader.
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