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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

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

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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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
Transcribed Image Text: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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