Page 381 - CITS - Computer Software Application -TT

COMPUTER SOFTWARE APPLICATION - CITS

while(( m = file_data.read() ) != -1) {
System.out.print((char)m);
}
file_data.close();
}

}
In the above code, we are trying to read the Hello.txt file and display its data or content on the screen. The
program throws the following exceptions:

1 The FileInputStream(File filename) constructor throws the FileNotFoundException that is checked exception.
2 The read() method of the FileInputStream class throws the IOException.
3 The close() method also throws the IOException.
Output:

How to resolve the error?
There are basically two ways through which we can solve these errors.
1 The exceptions occur in the main method. We can get rid from these compilation errors by declaring the
exception in the main method using the throws We only declare the IOException, not FileNotFoundException,
because of the child-parent relationship. The IOException class is the parent class of FileNotFoundException,
so this exception will automatically cover by IOException. We will declare the exception in the following way:
class Exception{

public static void main(String args[]) throws IOException {
...
...
}
If we compile and run the code, the errors will disappear, and we will see the data of the file.

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CITS : IT&ITES - Computer Software Application - Lesson 101 - 108