Use cases in Java - Interactive Code Practice

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Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a simple class named User.

Java

public class [1] {
    // class body
}

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

Auser

BUser

CMain

DAccount

Attempts:

3 left

2fill in blank

medium

Complete the code to create a method named greet that returns a String.

Java

public class Greeter {
    public [1] greet() {
        return "Hello!";
    }
}

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

AString

Bint

Cvoid

Dboolean

Attempts:

3 left

3fill in blank

hard

Fix the error in the code to correctly instantiate an object of class Car.

Java

public class Car {
    String model;

    public Car(String model) {
        this.model = model;
    }
}

Car myCar = new [1]("Tesla");

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

ACar

Bcar()

Ccar

DVehicle

Attempts:

3 left

4fill in blank

hard

Fill both blanks to create a method that checks if a user is adult based on age.

Java

public class User {
    int age;

    public boolean isAdult() {
        return age [1] [2];
    }
}

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

A>=

B18

C<

D21

Attempts:

3 left

5fill in blank

hard

Fill all three blanks to create a method that returns a map of user names and their ages if age is above 20.

Java

import java.util.Map;
import java.util.HashMap;

public class UserData {
    Map<String, Integer> users = new HashMap<>();

    public Map<String, Integer> getAdults() {
        Map<String, Integer> adults = new HashMap<>();
        for (String [1] : users.keySet()) {
            int [2] = users.get([1]);
            if ([2] [3] 20) {
                adults.put([1], [2]);
            }
        }
        return adults;
    }
}

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

Aname

Bage

C>

D<

Attempts:

3 left