What is the Java Virtual Machine (JVM)?

The JVM is a runtime environment that executes Java bytecode and provides platform independence, memory management, and garbage collection for Java applications.

What is the difference between JDK and JRE?

The JDK includes tools for developing Java applications, while the JRE provides the runtime environment required to execute Java programs.

What are Java collections?

Java collections are data structures from the java.util package, such as List, Set, and Map, that provide methods for storing, accessing, and manipulating groups of objects.

Java Interview Questions

31. What is method overloading?

32. What is method overriding?

33. What is the difference between overloading and overriding?

34. What is the difference between == and equals()?

35. How do hashCode() and equals() work together?

36. What are immutable objects in Java?

37. Why is String immutable in Java?

38. What is the difference between String, StringBuilder, and StringBuffer?

39. How does String pooling work?

40. What are access modifiers in Java?