How to make a program please can you explain in detail with all the codes and all

Question

means jar file

Answer 1

use eclipse to compile .class files....

Answer 2

create a class, write code and compile it using a java ide(ex: eclipse). after compiled the ".class" file a jar file will created

Answer 3

This question can be correctly answered if you are patient enough to go through the tutorials provided with the app. Plus, you need to know what problem you wish to solve with your program. Study is the key