Method Detail readFile public static double[][] readFile (java.io. File file) throws java.io.FileNotFoundException Reads from a file and returns a ragged aray of doubles The maximum rows is 10 and the maximum columns for each row is 10 Each row in the file is separated by a new line Each element in the row is separated by a space Suggestion: You need to know how many rows and how many columns there are for each row to create a ragged array. 1. Read the doubles from the file into an a temporary array [10][10] of Strings which was initialized to nulls. 2. Find out how many rows there are (any row that has the first element != null is a valid row) 3. Create the array based on the num of rows, i.e. double[][(Jarray = new double[#rows][] 4. Determine the number of columns for the first row (any element != null is a valid element) 5. Create the first row, i.e. array[0] = new double[#columns] 6. Put the values from the temporary array into in the row (don't forget to convert from strings to doubles) 7. Repeat for all rows Parameters: file - the file to read from Returns: a two dimensional ragged (depending on data) array of doubles if the file is not empty, returns a null if file is empty Throws: java.io.FileNotFoundException

EBK JAVA PROGRAMMING

9th Edition

ISBN:9781337671385

Author:FARRELL

Publisher:FARRELL

Chapter9: Advanced Array Concepts

Section: Chapter Questions

Problem 2PE

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I need some helping fixing my code for this method(in screenshot). Also could you explain tokens please!

public static double[][] readFile (java.io.File file) throws FileNotFoundException{

String[] temp = new String[10];

int row = 0;

int colum = 0;

int i = 0;

int k = 0;

double[][] Fill = null;

Scanner sc;

try {

sc = new Scanner(file);

String[] token;

while(sc.hasNextLine()){

temp[row] = sc.nextLine();

//split = line.split(" ");

row++;

}

Fill = new double[row][];

for(; i<row; i++){

token = temp[i].split(" ");

colum = token.length;

Fill[i] =new double[colum];

for(; k<token.length; k++) {

Fill[i][k]=Double.parseDouble(token[k]);

}

k = 0;

i++;

}

sc.close();

for(int p = 0; p<Fill.length;p++)

{

for(int v =0; v<Fill[colum].length; v++)

{

System.out.println(Fill[row][colum]+ " ");

}

System.out.println();

}

}catch( FileNotFoundException e) {

e.getMessage();

}

return Fill;

}

Method Detail
readFile
public static double[][] readFile (java.io. File file)
throws java.io.FileNotFoundException
Reads from a file and returns a ragged aray of doubles The maximum rows is 10 and the maximum columns for each row is 10
Each row in the file is separated by a new line Each element in the row is separated by a space Suggestion: You need to know how
many rows and how many columns there are for each row to create a ragged array. 1. Read the doubles from the file into an a
temporary array [10][10] of Strings which was initialized to nulls. 2. Find out how many rows there are (any row that has the first
element != null is a valid row) 3. Create the array based on the num of rows, i.e. double[][(Jarray = new double[#rows][] 4.
Determine the number of columns for the first row (any element != null is a valid element) 5. Create the first row, i.e. array[0] =
new double[#columns] 6. Put the values from the temporary array into in the row (don't forget to convert from strings to doubles)
7. Repeat for all rows
Parameters:
file - the file to read from
Returns:
a two dimensional ragged (depending on data) array of doubles if the file is not empty, returns a null if file is empty
Throws:
java.io.FileNotFoundException

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