Writing int [ ] Array in a file

import java.util.Vector;

import java.io.*;

public class Queue extends Vector {

/*

** FIFO, first in first out

*/

Queue() {

super();

}

void put(Object o) {

addElement(o);

}

Object get() {

if (isEmpty()) return null;

Object o = firstElement();

removeElement(o);

return o;

}

Object peek() {

if (isEmpty()) return null;

return firstElement();

}

}

To serialize (save the Queue state to a file) :

public static void main(String args[]) {

Queue theQueue;

theQueue = new Queue();

theQueue.put(new int[]{1, 2, 3, 4});

theQueue.put("ABCDE");

theQueue.put(new Integer(3));

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

// serialize the Queue

System.out.println("serializing theQueue");

try {

FileOutputStream fout = new FileOutputStream("thequeue.dat");

ObjectOutputStream oos = new ObjectOutputStream(fout);

oos.writeObject(theQueue);

oos.close();

}

catch (Exception e) { e.printStackTrace(); }

}

To unserialize (to load a previously saved Queue) :

public static void main(String args[]) {

Queue theQueue;

theQueue = new Queue();

// unserialize the Queue

System.out.println("unserializing theQueue");

try {

FileInputStream fin = new FileInputStream("thequeue.dat");

ObjectInputStream ois = new ObjectInputStream(fin);

theQueue = (Queue) ois.readObject();

ois.close();

}

catch (Exception e) { e.printStackTrace(); }

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

}

hope that helps

java_2006a at 2007-7-12 2:55:03 >

> ...

> hope that helps

No need for wrappers or collection classes. You can just serialize arrays of primitives.

Example:

// Write to disc:

String fileName = "test.ser";

int[] array = {6,6,6};

System.out.println(java.util.Arrays.toString(array));

FileOutputStream fos = null;

ObjectOutputStream out = null;

try {

fos = new FileOutputStream(fileName);

out = new ObjectOutputStream(fos);

out.writeObject(array);

out.close();

} catch(IOException ex) {

ex.printStackTrace();

}

// And to read it back:

int[] anotherArray = null;

FileInputStream fis = null;

ObjectInputStream in = null;

try {

fis = new FileInputStream(fileName);

in = new ObjectInputStream(fis);

anotherArray = (int[])in.readObject();

in.close();

} catch (ClassNotFoundException e) {

e.printStackTrace();

} catch(IOException e) {

e.printStackTrace();

}

System.out.println(java.util.Arrays.toString(anotherArray));

prometheuzza at 2007-7-12 2:55:03 >