Reading and writing binary data

• We can read and write data beyond ASCII characters, including primitive types such as int, double and short.

• DataInputStream and DataOutputStream are used to manipulate binary data of primitive types in files.

• DataOutputStream implements the DataOutput interface, which contains methods for recording all Java primitive types.

• Data is written in internal binary format, not in textual format.

• DataOutputStream methods throw an IOException in case of error.

• The DataOutputStream constructor requires an OutputStream object as a parameter to specify the output stream.

• FileOutputStream can be used to create the output stream to which data will be written.

• DataInputStream implements the DataInput interface for reading all Java primitive types.

• All read methods can throw an IOException.

• The class uses an instance of InputStream as a base, adding methods to read Java data types.

• DataInputStream reads data in binary, non-human readable format.

• Constructor: DataInputStream(InputStream flowInput), where flowInput defines the input stream.

• For reading files, FileInputStream can be used as InputStream parameter.

• Usage example: program that writes and reads different types of data to a file using DataOutputStream and DataInputStream.

The program output is shown here.
Writing 10
Writing 1023.56
Writing true
Writing 90.28
Reading 10
Reading 1023.56
Reading true
Reading 90.28

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