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how to make a formula in java?

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http://www.daniweb.com – ... I need help.. :( ....please teach me how to make formulas that can input in showInputDialog .. :( As a private math tutor for grade school children, you design an application to teach multiplication tables. As a prototype for your design, you begin with the number two. One set of controls contains the multiplicand and the multiplier, while the other set of controls contains the product. The game should allow for ten possible matches. The pupils should be allowed three attempts to select the correct product for the corresponding multiplicand and multiplier. When their selection is correct, the background color of the product should change color and a message should display to congratulate the pupil. if a correct selection has not been made after three attempts, a message should display to indicate and error. You also have decided to provide the pupil with a quiz that can be selected from a menu. The quiz should ask at least five questions and have the capability of accepting answers. When the answer is incorrect, a message should display to notify the pupil. The pupil should be able to continue answering until he or she selects the correct response or be able to escape if he or she does not know the correct response. (General)