Quiz - Workshop on Java

What is the purpose of Java generics?

• To allow type casting between different classes.
• To provide a way to implement multiple inheritance.
• To enable type-safe collections and classes.
• To allow runtime type determination.

What is type erasure in the context of Java generics?

• The process of removing generic type information at runtime
• The process of converting generic types to their raw types
• The process of replacing type parameters with their bounds or Object
• All of the above

Which of these classes is part of the Java Collections Framework?

• HashMap
• HashSet
• ArrayList
• All of the above

Which of these methods is not part of the Collection interface in Java

• add(E e)
• clear()
• get(int index)
• isEmpty()

Which of these classes does not implement the List interface in Java

• ArrayList
• HashSet
• Vector
• LinkedList

Which method is used to start a thread in Java?

• run()
• start()
• execute()
• launch()

What happens when two threads try to access a synchronized method at the same time in Java? 

• One thread will be allowed to enter the method, while the other thread will be blocked until the first thread exits the method.
• Both threads will be allowed to enter the method simultaneously.
• One thread will be allowed to enter the method, while the other thread will be terminated.
• Both threads will be blocked and neither will be able to enter the method.

What is the purpose of CompletableFuture in Java?

• To create a custom exception class.
• To manage multiple threads in a synchronized manner.
• To represent a future result of an asynchronous computation.
• To define a class that implements the Runnable interface.

Which method is used to combine two CompletableFuture instances and perform an action when both are complete?

• thenApply()
• thenCombine()
• thenAccept()
• thenCompose()

What is the purpose of the synchronized keyword in Java?

• To define a method as static.
• To make a method accessible across different threads.
• To prevent multiple threads from accessing a block of code simultaneously.
• To create a new thread.