Parameterized constructor in Java - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a parameterized constructor for the class.

Java

public class Car {
    String model;
    int year;

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

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ACar

Bcar

CCarConstructor

DConstructor

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different name than the class for the constructor.

Using lowercase instead of uppercase for the constructor name.

In Java, the constructor name must exactly match the class name, which is 'Car' here.

2fill in blank

medium

Complete the code to create an object of the class using the parameterized constructor.

Java

Car myCar = new [1]("Toyota", 2020);

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AVehicle

BCar

Ccar

DMyCar

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase 'car' instead of 'Car'.

Using a different class name.

To create an object, use the class name 'Car' with the new keyword.

3fill in blank

hard

Fix the error in the constructor declaration.

Java

public class Book {
    String title;
    int pages;

    public [1](String title, int pages) {
        this.title = title;
        this.pages = pages;
    }
}

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ABook

Bbook

CsetBook

DBookConstructor

Attempts:

3 left

💡 Hint

Common Mistakes

Adding a return type to the constructor.

Using a different name than the class for the constructor.

Constructors should not have a return type like 'void' and must be named exactly as the class.

4fill in blank

hard

Fill both blanks to complete the parameterized constructor and assign values.

Java

public class Student {
    String name;
    int age;

    public [1](String name, int age) {
        this.[2] = name;
        this.age = age;
    }
}

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AStudent

Bstudent

Cname

Dage

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase 'student' as constructor name.

Assigning to a wrong field name.

Constructor name must match class name 'Student'. Use 'name' to assign the parameter to the field.

5fill in blank

hard

Fill all three blanks to complete the class with a parameterized constructor and create an object.

Java

public class Laptop {
    String brand;
    int ram;

    public [1](String brand, int ram) {
        this.brand = [2];
        this.ram = ram;
    }

    public static void main(String[] args) {
        Laptop myLaptop = new [3]("Dell", 16);
    }
}

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ALaptop

Bbrand

Dlaptop

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase 'laptop' instead of 'Laptop'.

Assigning wrong variable to the field.

Constructor name and object creation use class name 'Laptop'. Use parameter 'brand' to assign to field.