Primitive vs reference storage in Java - Interactive Practice

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Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a primitive integer variable.

Java

int number = [1];

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A10

B"10"

Cnew Integer(10)

DInteger.valueOf(10)

Attempts:

3 left

2fill in blank

medium

Complete the code to create a reference to a String object.

Java

String text = [1];

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A10

Bnew int(5)

C"Hello"

Dtrue

Attempts:

3 left

3fill in blank

hard

Fix the error in the code to assign a new Integer object to a variable.

Java

Integer value = [1];

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Anew Integer(10)

B"10"

C10

DInteger.parseInt("10")

Attempts:

3 left

4fill in blank

hard

Fill both blanks to create an array of primitive ints and assign a value.

Java

int[] numbers = new int[[1]];
numbers[[2]] = 5;

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A3

B0

C1

D5

Attempts:

3 left

5fill in blank

hard

Fill all three blanks to create a String array, assign a value, and print it.

Java

String[] words = new String[[1]];
words[[2]] = [3];
System.out.println(words[0]);

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A2

B0

C"hello"

D"world"

Attempts:

3 left