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How can I add error handling facilities to this code?

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Hi everyone, i have this code that needs some error handling facilities (messages that warn user the data inputted is not valid that prvent crashing) added to it. I have no idea on how to do it and i accept any ideas. I'll post the code belllow. The code works by recieveing inputs through the console for student grades and calculating the total and the average. That works fine, but i need to include an error handling facility that doesnt allow the user to input letters, special characters or numbers outside the range 1-10. Can anyone help?

Program Name: The Edron Academy Grade Applet
NetBeans IDE 6.0
645 Words

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Google "regular expression", and "java regular expression"
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You will find details of regular expressions in the Java Tutorials.

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