Java Questions

add()

offer()

push()

insert()

@FunctionalInterface

@Override

@SuppressWarnings

@Deprecated

Callable is used for tasks that don't return a value, while Runnable is for tasks that do

Callable can be used with traditional threads, while Runnable requires an ExecutorService

Callable can throw checked exceptions, while Runnable cannot

Callable executes faster than Runnable

Yes, but the type parameter should be declared before the method name.

No, generic methods cannot be static.

Yes, but the type parameter should be declared after the 'static' keyword.

Yes, there are no restrictions.

It cancels the asynchronous task associated with the Future

It checks if the asynchronous task has completed or not

It sets a timeout for the asynchronous computation

It retrieves the result of an asynchronous computation, potentially blocking until it's available

HashMap is synchronized, while TreeMap is not.

HashMap maintains elements in insertion order, while TreeMap sorts elements based on keys.

HashMap allows null keys and values, while TreeMap does not.

HashMap provides faster retrieval times than TreeMap.

To schedule tasks for execution at fixed intervals

To manage and execute thread pools efficiently

To define custom locking mechanisms

To synchronize access to shared resources

java.lang.reflect.AnnotatedElement

java.lang.Class

java.lang.annotation.ElementType

java.lang.annotation.Annotation

It's an intermediate operation that modifies the stream elements

It's a terminal operation that triggers stream processing

It's a terminal operation that returns a new Stream

It's an intermediate operation primarily used for debugging

StringBuilder is not thread-safe, StringBuffer is thread-safe.

StringBuilder is mutable, StringBuffer is immutable.

StringBuilder is thread-safe, StringBuffer is not thread-safe.

There is no difference, they are aliases for the same class.