Why do two java files that differ only in comments produce different class files?

I have one named one Java file, which has only one comment line I compile it to generate the class file one Class and rename it old class. Then I opened one Java, introduces five additional comment lines and compiles it again to generate one class. Both class files have the same size, but when I run diff on them, such as:

Binary files One.class and old.class differ

This is my one Java file:

// One.java
class One
{
    public static void main(String [] args)
    {
        System.out.println("Hello Java world");
    }
}

This is the one I modified Java (attach comment line):

// One.java
// One.java
// One.java
// One.java
// One.java
// One.java
class One
{
    public static void main(String [] args)
    {
        System.out.println("Hello Java world");
    }
}

I use Java se 10 on IMAC running high Sierra

resolvent

Solution

Commissioning symbols; Basically, the code includes line numbers and other metadata for debugging You can use javap - V one Class and javap - V old Class check it @ h_ 502_ 4@ @H_ 502_ 4@