Constructor overloading in Java - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a constructor with no parameters.

Java

public class Car {
    String model;
    int year;

    public [1]() {
        model = "Unknown";
        year = 0;
    }
}

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

Acar

BCar

CCar()

Dvoid Car

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase 'car' instead of 'Car'.

Adding a return type like 'void'.

Including parentheses in the constructor name.

The constructor name must exactly match the class name, which is Car.

2fill in blank

medium

Complete the code to define a constructor with two parameters.

Java

public class Car {
    String model;
    int year;

    public Car(String [1], int y) {
        model = [1];
        year = y;
    }
}

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

Amodel

BModel

CcarModel

Dyear

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different parameter name than the one assigned.

Using uppercase letters incorrectly.

The parameter name should be model to match the assignment inside the constructor.

3fill in blank

hard

Fix the error in the constructor name to correctly overload it.

Java

public class Car {
    String model;
    int year;

    public [1](String model) {
        this.model = model;
        year = 2020;
    }
}

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

Acar

Bcar()

CCAR

DCar

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase 'car' instead of 'Car'.

Adding parentheses in the constructor name.

The constructor name must exactly match the class name Car with correct capitalization.

4fill in blank

hard

Fill both blanks to create a constructor that sets model and year.

Java

public class Car {
    String model;
    int year;

    public Car([1] model, [2] year) {
        this.model = model;
        this.year = year;
    }
}

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

AString

Bint

Cdouble

Dboolean

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong data types like double or boolean.

Mixing up the order of parameters.

The model is a String and year is an int.

5fill in blank

hard

Fill all three blanks to create an overloaded constructor with default year.

Java

public class Car {
    String model;
    int year;

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

    public Car([3] model, int year) {
        this.model = model;
        this.year = year;
    }
}

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

AString

B2023

Dint

Attempts:

3 left

💡 Hint

Common Mistakes

Using int instead of String for model.

Not setting a default year value.

The first constructor takes a String model and sets year to 2023. The second constructor takes a String model and an int year.