Question

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
A.Only A
B.Only C
C.A and C
D.B and D

Answer 1

ANSWER :

OPTION C

Details :

InputStream and Reader are the classes that help in file handling in JAVA .

These two have their own syntaxes .

The syntax of Buffered Reader is almost similar to that of Input Streamer .

They are helpful for taking inputs.

Answer 2

Option (C) is correct answer.

InputStream and Reader classes defined in java.io and used for file-handling are abstract.

About InputStream and Reader classes :

• The java.io package's InputStream class is an abstract superclass that represents a bytes input stream.

• Because InputStream is an abstract class, it can't be used on its own. Its subclasses, on the other hand, can be used to read data.

• The java.io package's Reader class is an abstract superclass that represents a sequence of characters. Because Reader is an abstract class, it is useless on its own. Its subclasses, on the other hand, can be used to read data.