JVM

Does new String("Hello_42") == "Hello_" + 42?

Are parameters passed by reference or by value in Java?

What types of references exist in Java?

What is inside .class file?

How much memory does an object occupy?

How does garbage collection work?

How to work with Shutdown Hooks

What is the difference between JDK and JRE?

What is classpath?

What is in the manifest file?