Default values in Java - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare an integer variable with its default value.

Java

int number = [1];

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

A"0"

Bnull

C1

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Using null for int variables causes errors.

Using quotes around 0 makes it a string, not an int.

In Java, the default value for an int variable is 0.

2fill in blank

medium

Complete the code to declare a boolean variable with its default value.

Java

boolean isActive = [1];

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

Anull

Bfalse

Ctrue

D"false"

Attempts:

3 left

💡 Hint

Common Mistakes

Using null for boolean causes errors.

Using quotes makes it a string, not a boolean.

The default value for a boolean in Java is false.

3fill in blank

hard

Fix the error in the code by completing the declaration of a String variable with its default value.

Java

String name = [1];

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

Anull

B0

C""

Dfalse

Attempts:

3 left

💡 Hint

Common Mistakes

Using empty quotes instead of null for default String value.

Assigning 0 or false to a String causes errors.

In Java, the default value for a String (which is an object) is null.

4fill in blank

hard

Fill both blanks to declare a double and a char variable with their default values.

Java

double price = [1];
char grade = [2];

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

A0.0

B'\u0000'

C0

Dnull

Attempts:

3 left

💡 Hint

Common Mistakes

Using 0 for char instead of '\u0000'.

Using null for primitive types causes errors.

The default value for double is 0.0 and for char is the null character '\u0000'.

5fill in blank

hard

Fill all three blanks to declare variables of types long, float, and boolean with their default values.

Java

long count = [1];
float rate = [2];
boolean flag = [3];

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

A0

B0.0f

Cfalse

Dnull

Attempts:

3 left

💡 Hint

Common Mistakes

Using null for primitives causes errors.

Forgetting the 'f' suffix for float literals.

Default values: long is 0, float is 0.0f, boolean is false.