Apex Intermediate Progress | ( Lessons)

Lesson: 11 | Interfaces

Notes
Video

Notes

An interface is like an Apex class in which none of the methods have been implemented. It only contains the method signatures, but the body of each method is empty. To use an interface, another class must implement it by providing a body for all of the methods contained in the interface.

Interfaces are used mainly for providing the abstraction layer for your code. They separate the implementation from declaration of the method.

public interface PurchaseOrder {

    Double discount();
}

This class implements the PurchaseOrder interface for customer purchase orders.

public class CustomerPurchaseOrder implements PurchaseOrder {
    public Double discount() {
        return .05;
    }
}

This class implements the PurchaseOrder interface for employee purchase orders.

public class EmployeePurchaseOrder implements PurchaseOrder {
      public Double discount() {
        return .10;
      } 
}

Prev You need to login to have access to the quizzes. Next

Mastered by 97 users.

Apex Intermediate

A. Apex DML Operations (8 lessons)

B. Apex Classes (17 lessons)

C. Apex Triggers (9 lessons)

D. Apex Exceptions (11 lessons)

E. Asynchronous Apex (6 lessons)

F. SOSL (10 lessons)

G. Testing Apex (9 lessons)

H. Apex Fast Recap (142 lessons)

I. Build Apex Coding Skills (64 lessons)

J. Miscellaneous (17 lessons)

You need to complete all the quizzes before certification.

Go to top

Login to your account

Lesson: 11 | Interfaces

Notes

Apex Intermediate