Constants - Exercises - ForceWise - Salesforce Study Lessons, Practice Exams and more

Question 1 of 10

1. Question

Imagine you’re working on a Salesforce project for a car dealership. They have a specific interest rate that they use for car loans, and this rate does not change. To represent this constant rate, you want to declare a variable in Apex that will store the value 0.05 (representing 5%) and ensure that its value cannot be modified anywhere else in the code.

How should you declare this?

public class CarDealership {
Double INTEREST_RATE = 0.05;
}

Question 2 of 10

2. Question

In a banking application, you’re trying to establish a minimum balance required for a new bank account. This value is always $100 and should remain unchanged in the system.

Declare this constant appropriately in the following code:

public class BankingApp {
Decimal MIN_BALANCE = 100;
}

Question 3 of 10

3. Question

You’re designing an application that processes space missions. There’s a constant representing the speed of light in vacuum called SPEED_OF_LIGHT_KM_PER_S, which is approximately 299792 kilometers per second.

Declare this constant in an Apex class named SpaceConstants ensuring that its value cannot be modified.

public class SpaceConstants {
static SPEED_OF_LIGHT_KM_PER_S = ;
}

Question 4 of 10

4. Question

You’re working on a billing application. For legal reasons, there’s a constant called TAX_RATE that represents the standard tax rate for all transactions, which is 5%.

Declare this constant in an Apex class named BillingConstants ensuring its value cannot be changed after being initialized.

public class BillingConstants {
static TAX_RATE = ;
}

Question 5 of 10

5. Question

You’re creating a configuration for a payment gateway. Every transaction has a standard processing fee, which is $2.50. Also, the maximum transaction amount for a single purchase, determined by a method called maxTransactionAmount(), needs to be stored as a constant.

Declare these in an Apex class named “PaymentConfig”.

public class PaymentConfig {
    static PROCESSING_FEE = ;
    static MAX_TRANSACTION_AMOUNT;

    public static Double maxTransactionAmount() {
        return 5000.00;
    }

     {
        MAX_TRANSACTION_AMOUNT = maxTransactionAmount();
    }
}

Question 6 of 10

6. Question

You’re creating a configuration for a gaming application. There’s a constant named MAX_PLAYERS which indicates the maximum number of players allowed in a single game room, and this limit is 10. Additionally, the initial health each player gets when they start a game is calculated by a static method named defaultHealth().

Declare these constants in an Apex class named GameConfig.

public class GameConfig {
    static MAX_PLAYERS = ;
    static STARTING_HEALTH;

    public static Integer defaultHealth() {
        return 100;
    }

     {
        STARTING_HEALTH = defaultHealth();
    }
}

Question 7 of 10

7. Question

In a class that deals with car properties, you have a constant representing the number of wheels a standard car has, which is 4. You also have a method called defaultColor() which returns a standard color for cars in your application, and you want to store this value as a constant.

Fill in the blanks:

public class CarProperties {
    static WHEEL_COUNT = ;
    static DEFAULT_COLOR;

    public static String defaultColor() {
        return “Blue”;
    }

     {
        DEFAULT_COLOR = defaultColor();
    }
}

Question 8 of 10

8. Question

You’re writing a class that deals with the properties of a circle. You want to declare a constant for PI which is approximately 3.14159. Furthermore, you have a method named defaultRadius() that computes a standard radius value for the circles in your application, and you want to store this value as a constant.

Complete the following class:

public class CircleProperties {
    static PI = ;
    static DEFAULT_RADIUS;

    public static Double defaultRadius() {
        return 5.5;
    }

     {
        DEFAULT_RADIUS = defaultRadius();
    }
}

Question 9 of 10

9. Question

Consider a class that models attributes of an equilateral triangle. You wish to specify a constant that represents the number of sides an equilateral triangle has. Additionally, there’s a method called defaultHeight() that calculates a standard height for these triangles in your system, and this value should be saved as a constant.

Fill in the missing parts:

public class TriangleAttributes {
    static SIDE_COUNT = ;
    static DEFAULT_HEIGHT;

    public static Double defaultHeight() {
        return 8.7;
    }

     {
        DEFAULT_HEIGHT = defaultHeight();
    }
}

Question 10 of 10

10. Question

Imagine you are working with a class that represents basic properties of a square. You want to define a constant that denotes the number of sides a square has. In addition, you have a method named defaultLength() which computes a standard side length for the squares in your application, and you want this value stored as a constant.

Complete the blanks in the following class:

public class SquareProperties {
    static SIDE_COUNT = 4;
    static DEFAULT_SIDE_LENGTH;

    public static Double defaultLength() {
        return 10.0;
    }

     {
        DEFAULT_SIDE_LENGTH = defaultLength();
    }
}

Constants – Exercises

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