Input from a txt file!

[Bhai]

Hey I just wanted to know how to inputs a specific value from a specific line ex. from line 2 i want to pull out the number and put it into a 2-D Array. The thing is I can read the txt file but i dont know how to put a a specific value in a 3-array

for example i have a txt file with the following information

Experiment #9
Mass vs Volume
10
63.5
110.89
432.0
239.7
42.8
54.678
984.3
76.01
85.4
109.42
11.5
19.3
75
41.3
7.51
9.6
170.96
13.77
15.23
20.1


i can read the file but dont know how to put it in 2d arrays and then outpout the result if you do can i get some help

[syntax_error]

I am not sure but I can refer you to this site here
its a nice tut
you can read it and see if you understand

[Euphoracle]

Well, here's something I wrote to create an mirc script of "Hacker Dan's Dictionary". It has a basic view of how to read/write files using streams. If you need clarification, just ask.

Java:

import java.io.*; import java.util.Vector; class DanDictionary {     public static void main( String[] arg ) {         if ( arg.length < 2 ) {       System.out.println( "Syntax:  DanDictionary <readPath> <writePath>" );       System.exit( 0 );       return;     }         String readPath = arg[ 0 ], writePath = arg[ 1 ];         try {             // Open an input stream       BufferedReader in = new BufferedReader( new FileInputStream( readPath ) );             // Open an output stream       PrintStream out = new PrintStream( new FileOutputStream( writePath ) );             // Temp vars       String buff = "";       String curLetter = null;       boolean isHackerDan = false;       Vector english = new Vector( );       Vector hackerDan = new Vector( );                   // Header       out.println( "// DanDictionary - Euphoracle\n" );       out.println( "on *:TEXT:*:* {\n" );       out.println( "    if ( Dan isin $nick ) {\n" );       out.println( "        set %msg $1-\n" );             // Do the work       while ( ( buff = in.readLine( ) ) != null ) {                 if ( buff == "" || buff.length( ) < 1  || buff.contains( "[edit]" ) ) {                     // Do nothing!                   } else if ( buff.charAt( 0 ) == '-' ) {                     if ( curLetter != null ) {                         for ( int i = 0; i < english.size( ); i++ ) {                             out.println( "        set %msg $replace( %msg, " + ( String )hackerDan.get( i ) + ", " + ( String )english.get( i ) + " )" );                           }                       }                     curLetter = Character.toString( buff.charAt( 1 ) );           isHackerDan = false;           english.clear( );           hackerDan.clear( );                   } else if ( buff.contains( "\t" ) ) {                     isHackerDan = true;                   } else {                     if ( isHackerDan ) {                         hackerDan.add( buff );             System.out.println( " HackerDanish: " + buff );                       } else {                         english.add( buff );             System.out.println( " English: " + buff );                       }                   }               }             // Finish it up       out.println( "\n        if ( %msg != $1- ) {\n" );       out.println( "            echo -a Translation: (Dan) %msg" );       out.println( "\n        }" );       out.println( "\n    }" );       out.println( "\n}\n" );             // Close our streams       in.close( );       out.close( );              System.out.println( "File written successfully." );           } catch ( IOException e ) {             System.out.println ( "Unable to write to file" );       System.exit( 0 );       return;           }       }   }

Essentially, you'd first want to create an object that can be used for sequential reading. We'll do this using the BufferedReader and FileInputStream classes.

Java:

// Open an input stream       BufferedReader in = new BufferedReader( new FileInputStream( "PathToFile.txt" ) );

I'll comment the rest of it for you to understand.

Java:

try {                   // Open an input stream       BufferedReader in = new BufferedReader( new FileInputStream( "PathToFile.txt" ) );                      // Acquire our information           String experimentNumber = in.readLine( ); // Read the first line           String experimentTitle = in.readLine( ); // The second           int dataCount = Integer.parseInt( in.readLine( ) ); // Get the third line.  This can throw a nasty exception if it doesn't get what it wants                      // Prepare our holder           double[ ][ ] massAndVolume = new double[ 2 ][ dataCount ];                      // Now we have our count, so lets loop that many times, twice           for ( int c = 0; c < 2; c++ ) {                        for ( int i = 0, i < dataCount; i++ ) { // This will allow us to insert it into the correct indice of the first dimension, and the second                                   massAndVolume[ c ][ i ] = Double.parseDouble( in.readLine( ) ); // Will throw a nasty eror if it doesn't get what it wants                                 }                      }                      // We're done, lets close the stream           in.close( );                      // Do something with it?           System.out.println( "Data for " + experimentNumber + " (" + experimentTitle + ")" );           for ( int c = 0; c < 2; c++ )             for ( int i = 0; i < dataCount; i++ )                   System.out.println( ( ( c == 0 ) ? "Mass:  " : "Volume:  " ) + massAndVolume[ c ][ i ] );                          // Or do something else, just an example.                    } catch ( Exception e ) {                   // Obviously you should specialize the exceptions, but this is just an example, right?           System.out.println( "Error!" );           e.printStackTrace( );                 }

The variables will contain the following information:

experimentNumber - Experiment #9
experimentTitle - Mass vs Volume
dataCount - 5
massAndVolume:
Major Index (0)
0 - 63.5
1 - 110.89
2 - 432.0
3 - 239.7
4 - 42.8
Second Index (1)
0 - 11.5
1 - 19.3
2 - 75
3 - 41.3
4 - 7.51

The output if you were to run this should be (untested, written in notepad, etc.):
> Data for Experiment #9 (Mass vs Volume)
Mass: 63.5
Mass: 110.89
Mass: 432.0
Mass: 239.7
Mass: 428
Volume: 11.5
Volume: 19.3
Volume: 75
Volume: 41.3
Volume: 7.51

If you wanted it, however to work in the opposite (IE, major index is the row, and second index is the mass or volume) you could change the following section:

Java:

// Now we have our count, so lets loop that many times, twice           for ( int c = 0; c < 2; c++ ) {                        for ( int i = 0, i < dataCount; i++ ) { // This will allow us to insert it into the correct indice of the first dimension, and the second                                   massAndVolume[ i ][ c ] = Double.parseDouble( in.readLine( ) ); // Will throw a nasty eror if it doesn't get what it wants                                 }                      }

This will change the format of massAndVolume to:
Major Index (0)
0 - 63.4
1 - 11.5
Second Index (1)
0 - 110.89
1 - 19.3
etc.