Java Naming Convention

I've been studying Java hard for the past week, and so far I've been able to generate reasonable code However, I seem to have a problem understanding the Java Naming Convention

I just read a tutorial that said that class names should start with capital letters If I look at the code I've written so far, I actually use lowercase names, such as:

import java.io.*;
import java.util.*;

class orange implements Comparator {
    public int mango(...) {
    }
}

class jason {
    public static void main(String args[]) throws java.io.IOException {
        {
            //content here
        }
    }
}

As you can see, both my names begin with lowercase letters When I compile and execute the program, I have no compilation errors and everything works as expected I should have thought that with the lowercase class name SART, it would end up with a compilation error: but that didn't happen Why?

If it helps, I run openjdk / icedtea

Solution

A good programmer must follow the naming conventions specified in any programming language in order to obtain a neat and effective program

For more Java Naming Conventions, see link