The basic rule is that the file name should match the name of the topmost public class in the .java file. The names are usually camel case and can contains alphabets and numbers. It should begin only with an alphabet.
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The java interpreter or JVM (Java Virtual Machine) is not able to execute the java source code for a program. The java source code first needs to be compiled into bytecode that can be processed by JVM. Producing bytecode make the program platform independent as each platform has its own JVM. It is also possible to directly write bytecode, bypassing the need to compile, but that would be tedious job and also not good for security purpose as the compiler checks for various errors in a program.
JNDI stands for Java Naming and Directory Interface JNDI is an API specified in Java technology that provides naming and directory functionality to applications written in the Java programming language
If the software is open source then generally they will provide the code in a separate link. I don't think it is possible to reverse-engineer the code of a program.
A Program in Java that spawns multiple threads is called a multithreaded program in Java.
AnswerA Java Drive-By is a Java Applet that is coded in Java and is put on a website. Once you click "Run" on the pop-up, it will download a program off the internet. This program can be a virus or even a simple downloader. If you'd like to get the source code or wanna know more information about a Java Drive-By, use Google.