What is Checked Exception in java

All exception or the classes that extend Throwable class except RuntimException or error are known as checked exception.

Examples of CheckedExceptions

1. ClassNotFoundException
2. NoSuchFieldException
3. IllegalAccessException
4. EoFException ...etc  

Thought Example

import java.io.*;

class DemoCheckedException {  

   public static void main(String args[]) 

   {

FileInputStream fis = null;

/*This constructor FileInputStream(File filename)

* throws FileNotFoundException which is a checked

* exception*/

        fis = new FileInputStream("B:/myfile.txt"); 

int m; 

/*Method read() of FileInputStream class also throws 

* a checked exception: IOException*/

while(( m = fis.read() ) != -1) 

{ 

System.out.print((char)m); 

} 

     /*The method close() closes the file input stream

* It throws IOException*/

fis.close();

   }

}

Result: Output of program is :

Exception in thread "main" java.lang.Error: Unresolved compilation problems: 

Unhandled exception type FileNotFoundException

Unhandled exception type IOException

Unhandled exception type IOException