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csHjavaA-2019
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revision
traverse and process
standard algorithms
Parallel Arrays
read text files
write text files
CSV files
Letter frequency
development workflow
indices
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write text files

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open, write and close a text file

developer task

study the project notes on this page to understand how to write values to a simple text file
fork the project and test the code with some text values
create a new project to implement a solution to the exercise at the foot of this page
you should have read the general notes about writing a file

program requirement: write a text file (example)

ask a user to type a series of five subject names, store the names in an array
write the array values to a text file

text file: output

the results file should contain a list with a value on each line
stored in text format with newline character after each line except for the last line

java code constructs to write to a file


open file
• choose a name for the file and open it for writing
write (a line) to file
• use fileWriter with print to output a line of text
• a newline should be added after each line of text, apart from the last line
this code will be nested within a loop to repeat for each value in the array
close file

program code


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exercise: binary headings

write a list to a text file for the binary place headings for 8 bite two’s complement starting with -128
create a new repl project
enter the values using the keyboard
store the number values in an integer array
write them to a text file

the results file should end up like this

developer task
program requirement: write a text file (example)
text file: output
java code constructs to write to a file
program code
exercise: binary headings
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