Classes and objects in Java - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a class named Car.

Java

public class [1] {
    // class body
}

Drag options to blanks, or click blank then click option'

Acar

BCar

CVehicle

DcarClass

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase names for class names.

Using a different name than the one intended.

The class name should be Car to match the declaration.

2fill in blank

medium

Complete the code to create an object of class Car named myCar.

Java

Car [1] = new Car();

Drag options to blanks, or click blank then click option'

ACar

BnewCar

CcarObject

DmyCar

Attempts:

3 left

💡 Hint

Common Mistakes

Using the class name as the variable name.

Using a name not mentioned in the instruction.

The variable name for the object should be myCar as specified.

3fill in blank

hard

Fix the error in the constructor declaration of class Car.

Java

public class Car {
    public [1]() {
        System.out.println("Car created");
    }
}

Drag options to blanks, or click blank then click option'

ACar

Bcar

Cvoid Car

DCar()

Attempts:

3 left

💡 Hint

Common Mistakes

Adding a return type to the constructor.

Using lowercase or different names for the constructor.

Constructors have no return type and must have the same name as the class, here Car.

4fill in blank

hard

Fill both blanks to define a method that returns the car's model name.

Java

public class Car {
    private String model;

    public [1] [2]() {
        return model;
    }
}

Drag options to blanks, or click blank then click option'

AString

Bint

CgetModel

DsetModel

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'int' as return type for a String variable.

Naming the method 'setModel' instead of 'getModel'.

The method should return a String and be named getModel to follow naming conventions.

5fill in blank

hard

Fill all three blanks to create a constructor that sets the model name.

Java

public class Car {
    private String model;

    public [1]([2] model) {
        this.[3] = model;
    }
}

Drag options to blanks, or click blank then click option'

ACar

BString

Cmodel

DcarModel

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong constructor name.

Using wrong parameter type.

Assigning to a wrong field name.

The constructor name is Car, it takes a String parameter named model, and assigns it to the field this.model.