Which of these classes defined in java.io and used for file-handling are abstract?
A. InputStream
B. PrintStream
C. Reader
D. FileInputStream
E. FileWriter

Which class is used to read data from the keyboard in Java?

A. Scanner

B. FileReader

C. BufferedReader

D. InputStream

What is the purpose of the `System.out.println()` method in Java?

A. It performs mathematical operations

B. It writes data to a file

C. It reads data from the keyboard

D. It prints data to the standard output stream followed by a newline

Which method is used to write data to a file in Java?

A. read()

B. print()

C. write()

D. scan()

How can you close a file after reading or writing in Java?

A. By using the `terminate()` method

B. By using the `close()` method of the file stream

C. By using the `readLine()` method

D. By using the `exit()` method