1. Reading from a file and Writing to a file
Text I/O
Reading from a file and Writing to a file

2. Add throws IOException to the main header
Things can happen while performing I/O, to handle this, Java needs the keywords throws IOException in the main method header
public static void main (String[] args) throws IOException

3. Declaring Files The File class is on pages 329-331
It is best to use relative file paths (meaning: keep the file reading from & the program using it in the same folder)
Declaring & assigning follows the reference data type’s standard
dataType identifier = new dataType();
File inFile = new File(“filename.txt”);

4. Declaring Scanner to read from a File
The Scanner class is on pages
Declaring & assigning follows the reference data type’s standard
dataType identifier = new dataType();
Scanner input = new Scanner(fileNameIdentifier);
Scanner input = new Scanner(new File(“filename.txt”));
Must close the Scanner to free the resource
indentifier.close();
input.close();

5. Declaring a PrintWriter to Write to a File
The PrintWriter class is on pages
Declaring & assigning follows the reference data type’s standard
dataType identifier = new dataType();
PrintWriter out = new PrintWriter(fileNameIdentifier);
PrintWriter out = new PrintWriter(new File(“filename.txt”));
Must close the PrintWriter to finish writing to the file
indentifier.close();
out.close();