How do you test if a string could be a valid int and then convert to int?

Hello, my name is Esran41 and I'm new to this site. I'm in computer science one this year and our current assignment is to make a console based Tic-Tac-Toe game. The final program must be able to detect errors in the user's input. For example, if the program asked the user for an int and he typed a character, our program must recognize this, print an error message, and then prompt him for the int again. I also need to know some common string manipulation methods(like String.length) and their syntax too. Again, I'm extremely new to java, so please include code fragments and example programs to demonstrate these methods.
To sum-it-up, I need to know how to do the following(The syntax):
Method (1)
- test an inputed string to see if it's a valid integer
- report an error to the user if it's not a valid integer
- if there was an error, prompt the user again
Method (2)
- Pass the inputed string as a parameter
- Convert the string into an integer
- return the integer
Also, what is a try-catch statement, what does it do, and how is it implemented?
Please post any advice or help that you may have pertaining to my problems.
Thanks!

Do not insult me. If I could read my computer science
book, I would. Please don't insult yourself... by pointing out your limitations...
I will apologize for my cynical remarks... You should see how many requests for " I need help" where the answer could be found so easily...
But it is quite obvious that you have access to the internet... If you did a search for Java, eventually you would find yourself as Sun's web site... Which means that you would have arrive at this page...
http://java.sun.com
and towards the bottom left had corner of that page you would find these links...
Learning
New to Java Center
- Tutorials & Code Camps
- Online Sessions & Courses
- Course Certification
- Instructor-Led Courses
- Quizzes
And you will find the same resources that I am using to learn Java...
I'm looking up this information not only for myself, but for my class too....
Thus, we are stuck with old computers, about twenty books for 220 kids, and one teacher who is great at >C++, but knows nothing about java.Then print out the Java documentation, goto Kinko's and make copies so that your class can have the reference material available to them, or ask your teacher to... Since he/she will need to learn the language also... But since they have programming experience they will be better able to explain the concepts of programming that you do not understand...
You can make any excuse for why it is difficult for you to learn, but in the end its totally irrelevant... If the school district cannot provide funding for class material, then instead of complaining with " I don't have a book... " start a community fund raiser to purchase those materials... Goto to the public library and see if they have resources you and your class can utilize... After all, it is your responsibility to educate yourself...
And most important of all, never ever say anything negative or limiting against yourself...
Do not insult me. If I could read my computer science book, I would. This is a statement against yourself... What does this statement tell you about yourself... You stated that I should not judge, but here you made a judgement about your own ability to learn...
To even insinuate that I skip class is an outrage to me. You should watch your tongue and not be so >quick to judge a situation.Why, do you ? Apparently I touched a nerve somewhere... But that does not matter...
Are you really concerned with what I think of you... If you are then you are a fool...
What other think or say have nothing to do with you... Do you know me, do I know you...
The answer is clear... I can give it to you... The Answer is No.
If you want to learn then learn... Read, Research, Practice and Read again... So simple...
Anyway... Have fun... Check out the tutorials, learn how to use the API documentation and practice coding...
and here are those links again...
The Java Tutorial
http://java.sun.com/docs/books/tutorial/index.html
Essentials of the Java Programming Language: A Hands-On Guide, Part 1 and 2
http://java.sun.com/developer/onlineTraining/Programming/BasicJava1/
http://java.sun.com/developer/onlineTraining/Programming/BasicJava2/
Language Essentials Short Course
http://java.sun.com/developer/onlineTraining/JavaIntro/contents.html
Others
The Java Tutorial
http://java.sun.com/docs/books/tutorial/index.html
Tutorial Index
http://java.sun.com/developer/onlineTraining/index.html
- MaxxDmg...
- ' He who never sleeps... '

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