Question 1

True or false: The Java language specification guarantees that 'float' division by zero throws an ArithmeticException.

Accepted Answer

False. Float division by zero yields Infinity or NaN, not an exception; integer division by zero throws ArithmeticException.

Question 2

True or false: The Java compiler does not enforce that checked exceptions must be caught or declared.

Accepted Answer

False. Checked exceptions must be caught or declared in the method signature; this is enforced at compile time.

Question 3

True or false: Java's 'null' was originally called 'Void' but changed to avoid confusion with the void keyword.

Accepted Answer

False. Java's null has always been null; no evidence supports it was ever called 'Void' in official design.

Question 4

True or false: The Java Virtual Machine (JVM) has no native support for unsigned integer types.

Accepted Answer

True. Java lacks unsigned primitives like unsigned int; developers use larger types or libraries for unsigned semantics.

Question 5

True or false: Java 9 introduced the concept of 'private interface methods' to share code between default methods.

Accepted Answer

True. Java 9 added private methods in interfaces, allowing code reuse among default methods without exposing them.

Question 6

True or false: Java's 'String' class is not immutable; it can be modified using reflection.

Accepted Answer

False. String is immutable by design; reflection can change internal fields, but this breaks guarantees and is discouraged.

Question 7

True or false: Java's 'Arrays.hashCode()' uses the same algorithm as 'Objects.hash()' for computing hash codes.

Accepted Answer

True. Both methods rely on the same underlying algorithm (e.g., 31 * sum + element), producing consistent hashes for arrays.

Question 8

True or false: Java allows method names to contain emoji characters since Java 8.

Accepted Answer

False. Java identifiers support Unicode letters, digits, and underscores, but emoji are not valid identifier characters.

Java programming language Trivia Questions