Heap memory in Java - Interactive Code Practice

ads_click

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create an object stored in heap memory.

Java

String str = new [1]("Hello");

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

Aboolean

Bint

Cchar

DString

Attempts:

3 left

2fill in blank

medium

Complete the code to assign a new object reference to the variable.

Java

MyClass obj = [1] MyClass();

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

Amake

Bnew

Ccreate

Dinit

Attempts:

3 left

3fill in blank

hard

Fix the error in the code to properly create an array in heap memory.

Java

int[] numbers = new int[1]5;

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

A{}

B()

C[]

D< >

Attempts:

3 left

4fill in blank

hard

Fill both blanks to create a new object and call its method.

Java

MyObject obj = [1] MyObject();
obj.[2]();

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

Anew

Bstart

Crun

Dcreate

Attempts:

3 left

5fill in blank

hard

Fill all three blanks to create a HashMap, add a key-value pair, and retrieve a value.

Java

HashMap<String, Integer> map = [1] HashMap<>();
map.[2]("age", 30);
int age = map.[3]("age");

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

Anew

Bput

Cget

Dadd

Attempts:

3 left