Real-world modeling 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] {

}

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

AEngine

BDrive

CCar

DVehicle

Attempts:

3 left

💡 Hint

Common Mistakes

Using a name that does not represent the object, like Engine or Drive.

The class name should be Car to model a car.

2fill in blank

medium

Complete the code to add a field for the car's color.

Java

public class Car {
    private [1] color;
}

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Aint

Bboolean

Cdouble

DString

Attempts:

3 left

💡 Hint

Common Mistakes

Using numeric types like int or double for color.

The color of a car is best represented as a String because it is text.

3fill in blank

hard

Fix the error in the constructor to set the car's color.

Java

public class Car {
    private String color;

    public Car(String [1]) {
        this.color = color;
    }
}

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

Acolor

Bpaint

Cshade

Dhue

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different parameter name than the one assigned to the field.

The constructor parameter must be named color to match the assignment this.color = color;.

4fill in blank

hard

Fill both blanks to add a method that returns the car's color.

Java

public class Car {
    private String color;

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

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

AgetColor

Bcolor

Cthis.color

DfetchColor

Attempts:

3 left

💡 Hint

Common Mistakes

Returning the parameter name or a wrong variable.

Using a method name that does not follow the getter naming convention.

The method name to get the color is getColor, and it returns this.color to access the field.

5fill in blank

hard

Fill all three blanks to add a method that sets the car's color.

Java

public class Car {
    private String color;

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

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

AsetColor

BnewColor

Ccolor

DupdateColor

Attempts:

3 left

💡 Hint

Common Mistakes

Using the same name for parameter and field without 'this.' prefix.

Using incorrect method or parameter names.

The setter method is named setColor, it takes a parameter newColor, and assigns it to the field color.