write text files

writing text files and introducing CSV files

Here are the main steps for writing or saving text to a file and also some sample Java code to see how it works.

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writing a file: main steps

open file

write to file

this will often involve a loop to repeat the write step for every line in a file

close file

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writing to file: java

open a text file

String outputFile = "results.txt";

PrintWriter fileWriter = new PrintWriter(outputFile);

store the name of the file

use the name of the file to create a PrintWriter for the file, call it fileWriter

if the file exists already then it will be overwritten

write next value from the array to the file(nest within a loop)

fileWriter.print(dataValues[i]);

access the value in the next position in the array and write it to the file

this code uses a loop index [i] to identify a position in a String array called textList

if (i < subject.length-1) {

fileWriter.print("\n");

}

a newline character is needed between each line, that means after each value except for the last

the conditional checks that the loop index has not reached the end and inserts the newline after the value

close the file

fileWriter.close();

additional file handling code for Java

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Java needs additional code to make file reading (and writing) work properly and to deal with any file errors

additional code needed for working with file in Java

import java.util.*;

import java.io.*;

Java needs to include additional features to make file handling work, add to the top of the program

dealing with file handling errors

throws IOException

Java needs to know how to report any file errors, add this code at the start of methods that depend on file handling

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