experiments

All kinds of coding experiments
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MatrixFile.java (1594B)

      1 import java.io.File;
      2 import java.io.FileNotFoundException;
      3 import java.util.Scanner;
      4 import java.util.regex.Matcher;
      5 import java.util.regex.Pattern;
      6 
      7 public class MatrixFile {
      8     File mFile;
      9     Scanner fileReader;
     10     Matrix matrixRead;
     11     Pattern pattern;
     12     Matcher matcher;
     13 
     14     public MatrixFile(String filename){
     15         this.mFile = new File(filename);
     16         pattern = Pattern.compile("(\\d)x(\\d)");
     17         try {
     18             int rows = 0;   int cols = 0;
     19             this.fileReader = new Scanner(this.mFile);
     20             String line = fileReader.nextLine();
     21             matcher = pattern.matcher(line);
     22             if (matcher.matches()){
     23                 rows = Integer.parseInt(matcher.group(1));
     24                 cols = Integer.parseInt(matcher.group(2));
     25             } else {
     26                 throw new Exception("Matrix in wrong format");
     27             }
     28             this.matrixRead = new Matrix(rows, cols);
     29             String newValue;
     30             for (int r = 0; r < rows; r++) {
     31                 for (int c = 0; c < rows; c++) {
     32                     if ((newValue = fileReader.next()) != null){
     33                         this.matrixRead.set(r, c, Double.parseDouble(newValue));
     34                     } else {
     35                         throw new Exception("Matrix in wrong format");
     36                     }
     37                 }
     38             }
     39 
     40 
     41         }
     42         catch (FileNotFoundException e){
     43             e.printStackTrace();
     44         }
     45         catch (Exception e){
     46             e.printStackTrace();
     47         }
     48     }
     49 
     50     public Matrix getMatrix(){
     51         return this.matrixRead;
     52     }
     53 
     54 }