Introduction
Java.io Exceptions - The data steaming, serialization and the file system for a system is provided by java.io.Exceptions. In general computing, I/O means Input or Output. Those methods throw the IOException whenever an input or output operation is failed or interpreted. Note that this won't be thrown for Reading or writing to Memory as Java will be handling it automatically.
Table
| Java.io Exceptions | Description |
|---|---|
| IOException | This exception represents when failure in I/O occurs. |
| FileNotFoundException | This exception represents that when attempting to open file through specified pathname has failed. |
| InvalidClassException | In serialization run time the class represented with inappropriate the this type of exception throws. |
| InvalidObjectException | This exception throws due to failure of validation of deserialized objects. |
| InterruptedIOException | This exception throws due to interruption in I/O operations. |
| ObjectStreamException | This exception throws due to object stream class. |
| NotSerializableException | This exception throws when the object required to have the serializable interface. |
| NotActiveException | This exception throws when the serialization or deserialization are not active. |
| WriteAbortedException | Because of during write operation the object stream exception throws. |
| SyncFailedException | This exception throws when synchronisation fails. |
| UnsupportedEncodingException | This exception throws when character encoding is not supported. |
| CharConversionException | This represents the basic class for character conversion exception. |
Example
Java.io Exceptions - Following is an example.
[java]package com.cp.io;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
public class IOExceptionExample {
private static String filepath = "E:\\splessons.txt";
public static void main(String[] args) {
BufferedReader br = null;
String curline;
try {
br = new BufferedReader(new FileReader(filepath));
while ((curline = br.readLine()) != null) {
System.out.println(curline);
}
} catch (IOException e) {
System.err.println("An IOException was caught :"+e.getMessage());
}
finally{
try {
if(br != null)
br.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
[/java]
This code is going to give exception that is the given file path is wrong. IOException is a very general exception that occurs when an IO operations fails. So you can understand that there is no standard way on how to solve this exception. The best thing you can do is to explicitly handle the exception in a try-catch block and print out the message of the exception. Then you can take the correct actions to solve this situation.
Output
The result will be as follows.
[java]An IOException was caught :E:\splessons.txt (The system cannot find the file specified)[/java]
Key Points
- Java.io Exceptions - The data steaming, serialization and the file system for a system is provided by java.io.Exceptions.