What are some advanced Java interview questions?

What are some advanced Java interview questions I should prepare for?

Some advanced Java interview questions include: 1. Explain the Java memory model. 2. What are the differences between HashMap and ConcurrentHashMap? 3. How does garbage collection work in Java?

Can you explain the Java memory model?

The Java memory model defines how threads interact through memory and what behaviors are allowed in concurrent programming. It specifies rules for visibility and ordering of variable access.

What are the differences between HashMap and ConcurrentHashMap?

HashMap is not thread-safe and can lead to data inconsistency when accessed by multiple threads. ConcurrentHashMap, on the other hand, is designed for concurrent access and allows multiple threads to read and write without locking the entire map.

How does garbage collection work in Java?

Garbage collection in Java is the process of automatically identifying and disposing of objects that are no longer in use, freeing up memory. The JVM uses different algorithms like Mark-and-Sweep and Generational Garbage Collection to manage memory efficiently.