Java Programming - MCQ Practice Questions

FileInputStream is a byte stream class, not a character stream. FileReader, BufferedWriter, and PrintWriter are all character stream classes.

The Serializable interface must be implemented to serialize objects. It is a marker interface with no methods. Classes implementing it can be serialized using ObjectOutputStream.

The flush() method forces any buffered output bytes to be written out. It does not close the stream, allowing further writes after flushing.

The second parameter 'true' in FileOutputStream constructor indicates append mode. If 'false' or omitted, the file is overwritten. With 'true', new data is appended to the existing file.

DataInputStream is specifically designed to read primitive data types like int, double, boolean, etc. from an input stream. BufferedInputStream provides buffering, FileInputStream reads from files, and ObjectInputStream deserializes objects.

Serializable is a marker interface (contains no methods) that signals to the JVM that objects of that class can be serialized. The absence of abstract methods means implementing classes don't need to override any methods; they just need to implement the interface to indicate serialization support.