Develop Object-Oriented Code MB-500 Practice Questions (Page 2)

Questions 6–10

1. 6foundation · easy

   In X++, when a class inherits from a base class, which of the following is true?

   • AThe derived class must override all methods of the base class
   • BThe derived class cannot have additional methods
   • CThe derived class automatically has all public and protected methods of the base class
   • DThe derived class can only inherit from one base class, but X++ supports multiple inheritance
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2. 7expert · hard

   A developer is implementing a custom validation that must run after a sales order line is updated. The validation needs to check if the line quantity exceeds a threshold and, if so, set a warning flag on the order header. The developer wants to avoid modifying the standard update method. Which approach should be used?

   • AUse a delegate on the SalesLine table to subscribe to the update event.
   • BUse a post-event handler on the SalesLine table's Updated event to perform the validation and update the header.
   • CUse Chain of Command on the SalesLine.update() method to perform the validation before calling next().
   • DOverride the update() method in a new class that extends SalesLine.
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4. 8expert · hard

   A developer is designing a new class hierarchy for a custom expense approval workflow. The company expects frequent changes to the approval rules and wants to minimize the need to modify existing classes when new approval types are added. The developer must choose between an abstract base class with virtual methods and an interface with a common method. Which consideration should drive the decision?

   • AUse an abstract base class with virtual methods to allow shared logic and easy extension through subclassing.
   • BUse a single concrete class with a large conditional statement to handle all approval types.
   • CUse a delegate to define the approval logic, allowing each approval type to subscribe.
   • DUse an interface because it allows multiple inheritance and is more flexible for future changes.
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5. 9application · medium

   A developer is implementing a custom validation framework. The framework needs to allow different validation rules to be plugged in at runtime. The developer wants to define a delegate that can be assigned to different methods. Which code snippet correctly declares a delegate in X++?

   • Adelegate boolean validate(ValidateEventArgs _args)
   • Bdelegate boolean validate() { return true; }
   • Cdelegate validate(ValidateEventArgs _args) as boolean
   • Ddelegate void validate(ValidateEventArgs _args) {}
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6. 10application · medium

   A developer is creating a custom workflow that needs to call different approval methods based on the approval type. The developer wants to use delegates to allow different methods to be assigned dynamically. Which statement correctly describes how delegates work in X++?

   • ADelegates can be declared in a class and implemented by event handler methods in other classes.
   • BDelegates can have a default implementation in the class.
   • CDelegates must be implemented in the same class where they are declared.
   • DDelegates are only used for form events.
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