/** 
 * Summary of readers/writers:
 * 
 * import java.io.*;
 * 
 * 1. Reading from a file
 * 
 * BufferedReader br = 
 *   new BufferedReader(new FileReader("filename.txt"));
 * 
 * br.readLine(); // returns the next line of the file
 *                // or null if the end of file is reached
 * 
 * 2. Writing to a file
 * 
 * PrintStream p = 
 *   new PrintStream(new FileOutputStream("filename.txt"));
 *
 * p.print("Text to put in file"); 
 * p.println("More text to put in the file.");
 * 
 * 3. Reading from System.in (command prompt/terminal)
 * 
 * BufferedReader br = 
 *   new BufferedReader(new InputStreamReader(System.in));
 * 
 * br.readLine(); // returns the next text typed in the 
 *                // command prompt or null if nothing has
 *                // been typed
 * 
 * 4. Writing to System.out
 * 
 * System.out.print();
 * System.out.println();
 */