Object lifetime in Java - Interactive Code Practice

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Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a new object of class Car.

Java

Car myCar = new [1]();

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AVehicle

Bcar

CCar

DObject

Attempts:

3 left

2fill in blank

medium

Complete the code to call the method that destroys an object reference.

Java

myCar = [1];

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Anull

Bvoid

Cremove

Ddelete

Attempts:

3 left

3fill in blank

hard

Fix the error in the code that tries to finalize an object.

Java

protected void [1]() throws Throwable {
    System.out.println("Cleaning up");
    super.finalize();
}

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

Afinalize

Bdelete

Ccleanup

Ddestroy

Attempts:

3 left

4fill in blank

hard

Fill both blanks to create an object and then remove its reference.

Java

Car [1] = new [2]();

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AmyCar

Bcar

CCar

DVehicle

Attempts:

3 left

5fill in blank

hard

Fill all three blanks to create a new object, assign null, and print a message.

Java

Car [1] = new [2]();
[1] = [3];
System.out.println("Object reference removed");

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AmyCar

BCar

Cnull

Dcar

Attempts:

3 left