readFile public statie 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
readFile public statie 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
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 really need help understanding this method
![readFile
public statie 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](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F8dba62d3-bab9-4b64-b137-060444d690d6%2F9a92d395-1c3c-446d-9053-21e7059d5212%2F7vpio.png&w=3840&q=75)
Transcribed Image Text:readFile
public statie 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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