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About Me

Hello, I am Naresh Joshi and I welcome you to Java By Source. Java By Source is a friend to Java programming and Java related technologies and frameworks like Spring, Hibernate, Struts, Web Services, Micro Services, Design Patterns, Multithreading, Collection, XML, SQL.


I love to create my own thoughts about anything which comes to my notice and I think we should always have our own thinking on everything rather than just following what others think.

That’s why I have started writing this blog to keep all my research notes and my thoughts regarding Java programming language in one place and make them available to others.

 Thanks for visiting Java By Source and I hope you enjoyed the posts. Any kind of feedback is always welcomed and appreciated. You can submit any query or suggestion in the Contact Us box (Bottom Right). You can also reach me on LinkedIn or Facebook or Github.

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Why Single Java Source File Can Not Have More Than One public class

According to Java standards and common practices we should declare every class in its own source file. And even if we declare multiple classes in the single source file (.java) still each class will have its own class file after compilation. But the fact is that we can declare more than one class in a single source file with below constraints, Each source file should contain only one public class and the name of that public class should be similar to the name of the source file. If you are declaring the main method in your source file then main should lie in that public class If there is no public class in the source file then main method can lie in any class and we can give any name to the source file. If you are not following 1st constraint then you will receive a compilation error saying “ The public type A must be defined in its own file ”.  While if you are not following the second constraint you will receive an error “ Error: Could not find or load main class User ” after ...
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Java Cloning - Copy Constructor versus Cloning

In my previous article Java Cloning and Types of Cloning (Shallow and Deep) in Details with Example , I have discussed Java Cloning in details and answered questions about how we can use cloning to copy objects in Java, what are two different types of cloning (Shallow & Deep) and how we can implement both of them, if you haven’t read it please go ahead. In order to implement cloning, we need configure our classes to follow below steps Implement Cloneable interface in our class or its superclass or interface, Define clone() method which should handle CloneNotSupportedException (either throw or log), And in most cases from our clone() method we call the clone() method of the superclass. And super.clone() will call its super.clone() and chain will continue until call will reach to clone() method of the Object class which will create a field by field mem copy of our object and return it back. Like everything Cloning also comes with its advantages and disadvantages. However, Java c...
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Spring Data JPA Auditing: Saving CreatedBy, CreatedDate, LastModifiedBy, LastModifiedDate automatically

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