U1. Files and Serialization

What is the key difference between text and binary files?

• Text files store data as bytes, while binary files store characters.

• Text files are human-readable, while binary files are not.

• Binary files are faster to read, while text files are less efficient.

• Binary files cannot be opened on certain operating systems.

Which of the following classes is used to read lines from a text file in Java?

• FileWriter

• BufferedReader

• DataInputStream

• ObjectInputStream

What will the code in the image do?

• Write the string "Hello, world!" to output.txt.

• Throw an exception because BufferedWriter cannot be closed before FileWriter.

• Write a single character 'H' to output.txt.

• Create the file output.txt but not write anything to it.

Which method in FileInputStream is used to read a single byte from a binary file?

• readLine()

• read()

• readByte()

• getByte()

Serialization in Java requires which interface to be implemented?

• Serializable

• Serializate

• IOSerializate

• IOSerializable

What exception is thrown if a file does not exist when using FileInputStream?

• NullPointerException

• FileNotFoundException

• IOException

• StreamCorruptedException

What does the following line of code do?

output.writeObject(object);

• Writes a character to the file.

• Writes an object to the file after converting it to bytes.

• Saves a text representation of the object.

• Appends an object to an existing file.

Which class is used for reading objects from a binary file in Java?

• ObjectOutputStream

• FileReader

• ObjectInputStream

• DataInputStream

What is the primary purpose of the Files.readAllLines() method?

• To read all lines of a file and write them to another file.

• To read and return all lines of a file as a list of strings.

• To count the number of lines in a file.

• To read and return all lines of a file as a ResultSet.

Which method is used to write primitive data types to a binary file?

• writeObject()

• writeInt()

• writePrimitive()

• writeValue()