Using Comparators to sort objects in Java
Comparator interface is used to order the objects of user-defined classes. A comparator object is […]
Use comparable to sort first by 1st field and then second field in Java
In order to sort first by ID and if the Id’s are same then sort […]
Builder Design Pattern in Java
Builder pattern was introduced to solve some of the problems with Factory and Abstract Factory […]
Shallow vs Deep copy in Java
When creating copies of arrays or objects one can make a deep copy or a […]
Efficiently removing elements while iterating a collection in Java
One of the common problem while removing elements from an ArrayList in Java is the […]
Spring Boot CRUD REST API with MySql
Here is an example of the REST API using spring boot with MySql as the […]
Use your class as a bean in Spring Boot
Depending on your needs, you can either leverage @ComponentScan to automatically detect your class and […]
Sort List of Collections in Java using Comparable interface
A comparable object is capable of comparing itself with another object. The class itself must […]
Iterate around an ArrayList using Iterator
Example below shows how to iterate around an ArrayList. Example Output
What is the use of equals method in Java?
Equals method is used when we compare two objects. Default implementation of equals method is […]
TreeMap in Java
TreeMap is Red-Black tree based NavigableMap implementation. It is sorted according to the natural ordering […]
Serialization and Deserialization in Java with Example
Serialization is a mechanism of converting the state of an object into a byte stream. […]
What is the purpose of Serialization in Java?
Serialization is simply turning an existing object into a byte array. This byte array represents […]
Tight Coupling and loose coupling
Tight Coupling: Tightly coupled object is an object that needs to know quite a bit […]
About Design Patterns
The design patterns are language independent strategies for solving common object-oriented design problems. When you […]
Spring Boot CRUD using Thymeleaf MySql
This CRUD example uses a product table, performs crud operations using spring boot and thymeleaf. […]