How to Convert a Java Integer to Bytes
- 1). Create a new class in your project; the name is irrelevant, but make sure you select the check box "public static void main(String[] args)" so you have somewhere to add your code that allows you to test it.
- 2). Create an Integer object. Note that you can't work with a simple "int" primitive; it has to be an Integer. Use the following code to create an Integer from an int value.
int theInt = 5;
Integer theIntegerObject = new Integer(theInt); - 3). Add the following code to retrieve a byte array representation of the object:
final ByteArrayOutputStream baos = new ByteArrayOutputStream();
final ObjectOutputStream oos = new ObjectOutputStream(baos);
oos.writeObject(theIntegerObject);
final byte[] bytes = baos.toByteArray();
// use bytes as necessary. - 4). To get your object back -- in this case, an Integer -- you can reverse the process in a similar manner:
ByteArrayInputStream bais = new ByteArrayInputStream(bytes);
ObjectInputStream ois = new ObjectInputStream(bais);
final Object obj = ois.readObject();
Cast the returned object to the type you're expecting.
Source...