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I think its not. You can use Scanner class to get data from Keyboard. I have seen many apps where in Scanner is used.

I debugged your program and found following errors.

1.You have used semicolon in if second if statement
if(ans =='B' || ans =='b');
Remove this semicolon and write statement as
if(ans =='B' ||...

Hi, Please tell what is Keyboard here. I am unable to resolve it. Is it some other class or an object