Question

Which exception is thrown by read() method of inputstream class?

Answer 1

Hey There!!



Short Answer: IOException



Long Answer:



JAVA has many systems and methods for taking input from a file. 

JAVA has an abstract class, called InputStream.


This InputStream class is the superclass of many other subclasses, like FileInputStream, ByteInputStream, etc.

The InputStream class has three methods titled as read()



-> public abstract int read() throws IOException


This method reads the next byte of data from the input stream. It returns a integer value from 0 to 255. End Of File (EOF) is marked as -1.
It throws IOException if there's an error in reading from file.



-> public int read(byte[] b) throws IOException


This method reads bytes from the file and stores them into a buffer array b

It also throws IOException if an error has occured while reading from file.



-> public int read(byte[] b, int off, int len) throws IOException


This method starts reading data, and reads up to len bytes of data.

The bytes are stored in buffer array b, and storage starts from position b[off].


That is, the bytes are stored in b[off], b[off+1], b[off+2], etc

This method can throw three exceptions:
IOException - If first byte cannot be read for any reason, or any other IO error occurs

NullPointerException - If b is null

ArrayIndexOutOfBoundsException - If off is negative, or len is negative, or if len is greater than b.length-off


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In any case, there is one common exception, which is also your answer: IOException



Hope it helps
Purva
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