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

111. How do escape analysis and scalar replacement optimize performance?

112. What are just-in-time (JIT) compilation strategies?

113. How does HotSpot optimize Java execution?

114. What are interpreted mode and compiled mode in JVM execution?

115. What causes JVM deoptimizations?

116. How would you investigate JIT compilation issues?

117. What are inline caching and method inlining?

118. How does polymorphism affect JIT optimization?

119. What are garbage collector algorithms available in Java?

120. How do Serial, Parallel, CMS, G1, ZGC, and Shenandoah differ?