Advanced Java Programming Concepts
Test your knowledge of Java's advanced features, design patterns, and best practices
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Quiz Questions & Answers
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Question 1: What is the main purpose of the 'volatile' keyword in Java?
To prevent class inheritance
To ensure thread-safe memory visibility
To optimize garbage collection
To restrict method overriding
Question 2: Which design pattern would you use to ensure only one instance of a class exists throughout the application lifecycle?
Singleton
Factory
Observer
Builder
Question 3: What happens when you call wait() on an object without holding its monitor?
Nothing, the program continues normally
The program crashes
IllegalMonitorStateException is thrown
The thread goes into waiting state anyway
Question 4: What is the primary difference between Comparable and Comparator interfaces?
Comparable provides external comparison logic
Comparable modifies the original class
Comparator can only compare primitive types
There is no difference
Question 5: What is the purpose of the finalize() method in Java?
To close database connections
To perform cleanup before garbage collection
To terminate the JVM
To release memory manually
Question 6: What is the main advantage of using CompletableFuture over Future?
It uses less memory
It supports chaining and composition
It's faster to execute
It's thread-safe by default
Question 7: What is the purpose of the default method in Java interfaces?
To enforce implementation
To provide backward compatibility
To override Object class methods
To create abstract classes
Question 8: What is the key difference between fail-fast and fail-safe iterators?
Fail-safe iterators work on a copy of the collection
Fail-fast iterators are faster
Fail-safe iterators use more memory
There is no difference
Question 9: What is the purpose of the synchronized keyword in Java?
To make variables thread-safe
To prevent multiple thread access
To optimize code execution
To prevent inheritance
Question 10: What is the difference between checked and unchecked exceptions?
Checked exceptions must be handled or declared
Unchecked exceptions are faster
Checked exceptions are automatically handled
There is no difference
Question 11: What is the purpose of the transient keyword in Java?
To make variables thread-safe
To skip serialization of a field
To prevent variable modification
To optimize memory usage
Question 12: What is the main advantage of using String Pool in Java?
Memory optimization
Faster string operations
Thread safety
Better garbage collection
Question 13: What is the purpose of the final keyword when applied to a method parameter?
Parameter cannot be modified within method
Method cannot be overridden
Parameter becomes thread-safe
Parameter is stored in memory longer
Question 14: What is the main difference between HashSet and TreeSet?
TreeSet maintains insertion order
TreeSet maintains sorted order
HashSet is faster
TreeSet allows null elements
Question 15: What is the purpose of the native keyword in Java?
To optimize code execution
To indicate platform-specific code
To prevent inheritance
To ensure thread safety