int howMany = 20;
// To avoid resizing the buffer, calculate the size of the
// byte array in advance.
ByteArrayOutputStream bout = new ByteArrayOutputStream(howMany*4);
DataOutputStream dout = new DataOutputStream(bout);
// First two Fibonacci numbers must be given
// to start the process.
int f1 = 1;
int f2 = 1;
dout.writeInt(f1);
dout.writeInt(f2);
// Now calculate the rest.
for (int i = 3; i <= 20; i++) {
int temp = f2;
f2 = f2 + f1;
f1 = temp;
dout.writeInt(f2);
}
FileOutputStream fout = new FileOutputStream("fibonacci.dat");
try {
bout.writeTo(fout);
fout.flush();
}
finally {
fout.close();
}
