HardJava
Java Quiz: advanced memory, threads and modern API
Test your advanced Java knowledge: heap and stack, garbage collector, immutable String, threads, synchronized, volatile, ExecutorService, Optional and records.
Fauna quizzes
Animals, species, records
Fauna means all the animals of a habitat or region, and this theme explores their diversity: mammals, birds, reptiles, amphibians, fish and insects. Questions touch on the classification of species, diets, reproduction, migration, adaptations to cold or heat, and endangered species including the IUCN Red List.
They help tell an insect from a spider, a reptile from an amphibian, a whale from a fish, and get to know animals as different as the wolf, the penguin or the salamander. The Fauna quizzes are free, span five difficulty levels from very easy to expert, and every answer is explained.
Quizzes
MediumJava
Java Quiz: OOP, inheritance, interfaces and collections
Test your object-oriented programming knowledge in Java: inheritance, interfaces, encapsulation, static, exceptions, collections, generics and equals.
EasyJava
Java Quiz: language basics, types and syntax
Test your Java basics: its creator, the JVM, the JDK and the JRE, the boolean and char types, String, arrays, the main method and class names.
Related themes
Frequently asked questions about Fauna
How many legs does an insect have?
An adult insect has six legs, attached to the thorax, and its body is divided into three parts: head, thorax and abdomen. A spider, with eight legs and two body sections, is not an insect but an arachnid.
Why are whales not fish?
Whales are mammals: they breathe air through lungs by way of a blowhole, are warm-blooded, give birth to live young and feed them milk. Fish breathe underwater through gills and are generally cold-blooded.
What does the IUCN Red List mean?
The IUCN Red List, run by the International Union for Conservation of Nature, assesses how likely species are to go extinct. It sorts them into categories, from 'Least Concern' to 'Extinct', including 'Vulnerable', 'Endangered' and 'Critically Endangered'.