Writing data to files in Java:

The stream classes that allow you to read and write data of primitive data types in binary form are DataInputStream and DataOutputStream. The Scanner class cannot process binary data correctly. You need to layer other streams on top of these basic streams to access convenient methods for reading data.

Output of binary format data is done using the DataOutputStream class, which is the output analogue of the DataInputStream class. It allows writing data to a stream (typically to a file), which can be read back using a DataInputStream object.
The streams for this are set up as shown below. For example:

FileOutputStream fos = new FileOutputStream("payroll.dat"); DataOutputStream dataOut = new DataOutputStream(fos);

This creates a file called payroll.dat and prepares it for output of binary data, which is achieved by the use of DataOutputStream methods, such as writeBoolean and writeLong.

For example, if you wish to write a boolean value, isFull, and a long integer, primeValue, to a DataOutputStream referenced by dataOut, then this would be achieved by:

dataOut.writeBoolean(isFull);
dataOut.writeLong(primeValue);

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