Java tutorial
import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.ObjectInputStream; import java.io.ObjectOutputStream; public class InputOutputDemoObjectBinaryFile { public static void main(String[] a) throws Exception { //Write an object or array to binary file "java2sObject.dat": ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("java2sObject.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("java2sObject.dat")); int[] ia = (int[]) (ois.readObject()); System.out.println(ia[0] + "," + ia[1] + "," + ia[2] + "," + ia[3] + "," + ia[4]); } }