Converting string inputs for command line to integers using parseInt()

Question

Hi,
My program takes in an input from the command line - "args[0]".
This line is supposed to be an integer but of course I depending on the user entering the correct data which is never a good scenerio. I used the line "int year = Integer.parseInt(args[0]); I get an error though if the user enters something like "java myProgram Hello" instead of "java my Program 1982".
I want my program to continue running even if the input can't be converted to an integer. At the moment, it is terminating due to an invalid input. Is there anything I can do to keep this program running even if the input is invalid?
Thanks

Answer 1

Use a try/catch block
int year;
try {
   year = Integer.parseInt(args[0]);
} catch (NumberFormatException nfe) {
    System.err.println("Usage: java myProgram  {year}");
    System.exit(-1);
}