// Example 190 from page 151

//

import java.io.*;

class Example190 {

public static void main(String[] args)

throws IOException, ClassNotFoundException {

// Write numbers, words etc on file "f.txt" in human-readable form:

PrintWriter pwr = new PrintWriter(new FileWriter("f.txt"));

pwr.print(4711); pwr.print(' '); pwr.print("cool"); pwr.close();

// Read numbers and words from human-readable text file "f.txt":

StreamTokenizer stok = new StreamTokenizer(new FileReader("f.txt"));

int tok = stok.nextToken();

while (tok != StreamTokenizer.TT_EOF)

{ System.out.println(stok.sval); tok = stok.nextToken(); }

// Write primitive values to a binary file "p.dat":

DataOutputStream dos = new DataOutputStream(new FileOutputStream("p.dat"));

dos.writeInt(4711); dos.writeChar(' '); dos.writeUTF("cool"); dos.close();

// Read primitive values from binary file "p.dat":

DataInputStream dis = new DataInputStream(new FileInputStream("p.dat"));

System.out.println(dis.readInt()+"|"+dis.readChar()+"|"+ dis.readUTF());

// Write an object or array to binary file "o.dat":

ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("o.dat"));

oos.writeObject(new int[] { 2, 3, 5, 7, 11 }); oos.close();

// Read objects or arrays from binary file "o.dat":

ObjectInputStream ois = new ObjectInputStream(new FileInputStream("o.dat"));

int[] ia = (int[])(ois.readObject());

System.out.println(ia[0]+","+ia[1]+","+ia[2]+","+ia[3]+","+ia[4]);

// Read and write parts of file "raf.dat" in arbitrary order:

RandomAccessFile raf = new RandomAccessFile("raf.dat", "rw");

raf.writeDouble(3.1415); raf.writeInt(42);

raf.seek(0); System.out.println(raf.readDouble() + " " + raf.readInt());

// Read from a String s as if it were a text file:

Reader r = new StringReader("abc");

System.out.println("abc: " + (char)r.read() + (char)r.read() + (char)r.read());

// Write to a StringBuilder as if it were a text file:

Writer sw = new StringWriter();

sw.write('d'); sw.write('e'); sw.write('f');

System.out.println(sw.toString());

// Write characters to standard output and standard error:

System.out.println("std output"); System.err.println("std error");

// Read characters from standard input (the keyboard):

System.out.print("Type some characters and press Enter: ");

BufferedReader bisr = new BufferedReader(new InputStreamReader(System.in));

String response = bisr.readLine();

System.out.println("You typed: '" + response + "'");

// Read a byte from standard input (the keyboard):

System.out.print("Type one character and press Enter: ");

byte b = (byte)System.in.read();

System.out.println("First byte of your input is: " + b);

}

}