Logical operators in Java - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to check if both conditions are true using the AND operator.

Java

boolean result = (a > 5) [1] (b < 10);

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

A|

B||

C&&

D!

Attempts:

3 left

💡 Hint

Common Mistakes

Using || which means OR instead of AND.

Using single & which is a bitwise operator here.

The AND operator in Java is &&. It returns true only if both conditions are true.

2fill in blank

medium

Complete the code to check if either condition is true using the OR operator.

Java

boolean result = (x == 0) [1] (y == 1);

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

A||

B&&

C&

D!

Attempts:

3 left

💡 Hint

Common Mistakes

Using && which means AND instead of OR.

Using single | which is a bitwise operator here.

The OR operator in Java is ||. It returns true if at least one condition is true.

3fill in blank

hard

Fix the error in the code to negate the condition correctly.

Java

boolean isFalse = [1] flag;

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

Aflag

B~

C!!

D!

Attempts:

3 left

💡 Hint

Common Mistakes

Using double negation !! which returns the original value.

Using bitwise complement ~ which works on integers, not booleans.

The NOT operator in Java is !. It negates the boolean value.

4fill in blank

hard

Fill all three blanks to create a condition that checks if number is between 10 and 20 inclusive.

Java

boolean inRange = (number [1] 10) [2] (number [3] 20);

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

A>=

B&&

C<=

D||

Attempts:

3 left

💡 Hint

Common Mistakes

Using OR instead of AND which allows numbers outside the range.

Using > or < instead of >= or <= which excludes boundary values.

To check if a number is between 10 and 20 inclusive, use >= and <= with AND &&. Here, BLANK_1 is >= (A), BLANK_2 is && (B), and BLANK_3 is <= (C).

5fill in blank

hard

Fill all three blanks to create a condition that checks if a character is a vowel (a, e, i, o, u).

Java

boolean isVowel = (ch == 'a') [1] (ch == 'e') [2] (ch == 'i') [3] (ch == 'o') || (ch == 'u');

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

A||

B&&

C==

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Using AND instead of OR which requires ch to be all vowels at once.

Using != which checks for not equal.

To check if ch is any vowel, use OR || between each equality check.