Write a simple java program using exceptions?

Answer 1

Here's a Hello World application:

import static java.lang.System.out;

class HelloWorld

{

public static void main(string[] arguments)

{

out.println("Hello world!") //this will print out the words 'Hello world!' to the screen

} //End of main method

} //End of class HelloWorld

Answer 2

The most common reason I have for catching Exceptions in Java is when reading information from a file. So let's look at an example where we read and display the contents of a file.

// Note that the main method may throw a FileNotFoundException.

// This means that if the file we try to read from doesn't exist, the program will

// exit with an Exception.

public static final void main(final String[] args) throws FileNotFoundException {

// Create a new FileReader object which reads from myfile.txt

// This is the line which may throw the FileNotFoundException

Reader in = new FileReader("myfile.txt");

// Begin the try block, which will catch any IOExceptions

try {

// Read and display the file contents

int ch;

while ((ch = in.read()) != -1) {

System.out.print((char) ch);

}

// Close the input object

in.close();

} catch (IOException ex) {

}

// And we're done.

System.out.println("End Of File Reached");

}