Complete PDI Salesforce Materials

 Option B: Custom events in LWC allow data to be passed using the detail property of the CustomEvent object. This is the recommended way to pass data in a custom event.

To notify the parent component when the child component’s Next button is clicked, the child component can dispatch a custom event. The parent component listens to this event and handles navigation accordingly.

Interfaces in Java and Salesforce Apex:

In Java or Apex, interfaces define a contract that classes must fulfill. They provide method signatures that any implementing class must define.

The keyword implements is used to implement an interface.

Classes and Inheritance:

A class in Java/Apex cannot use extends to inherit from an interface. The extends keyword is reserved for inheriting from another class, while implements is used for interfaces.

Multiple Interfaces:

A class can implement multiple interfaces in both Java and Salesforce Apex. This is done by separating interface names with commas after the implements keyword.

Correct Syntax:

To create a DrawList class that implements both Sortable and Drawable interfaces, the syntax must:

Use implements for interfaces.

Provide implementations for all methods defined in the interfaces.

Analysis of Options:

Option A:

Uses implements for each interface separately, which is syntactically incorrect in Java/Apex.

Invalid due to redundancy.

Option B:

Correctly uses implements for multiple interfaces separated by a comma.

Provides implementations for both methods, sort() and draw().

Option C and D:

Use extends for interfaces, which is invalid. Interfaces cannot be extended by classes.

Final Implementation:

public class DrawList implements Sortable, Drawable {

public void sort() {

// Implementation of sort method

}

public void draw() {

// Implementation of draw method

}

}

References:

Apex Classes and Interfaces Documentation

Trailhead Module on Apex Interfaces

Option B is the correct implementation as it adheres to the rules for working with interfaces in Java/Apex.

The Lightning component cannot directly perform SOQL queries.

An Apex class annotated with @AuraEnabled provides server-side logic that can execute the SOQL query and return the data to the Lightning component.