CheckingAccount( String accNumber, String holder, int start )
{
  initialization of data
}
Since parameters are used only inside the constructor, they often have shorter, less descriptive names than the names given to more permanent data.
So far, the class looks like this:
class CheckingAccount
{
  // instance variables
  String accountNumber;
  String accountHolder;
  int    balance;
  //constructors
  CheckingAccount( String accNumber, String holder, int start )
  {
    ______________ = _______________________ ;
    ______________ = _______________________ ;
    ______________ = _______________________ ;
  }
   methods
}
Next you need to complete the constructor with three statements that will initialize the object's data.