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Categories
Category Archives: Java
Immutable objects
Most of the objects in Java are mutable. It means that their state/fields can be changed after the object was created. The examples of those are: ArrayList, Calendar, StringBuilder. Immutable objects An object is immutable if its state/fields cannot be … Continue reading
Delete directory with contents in Java
Removing empty directory in Java is as simple as calling File.delete() (standard IO) or Files.delete() (NIO) method. However, if the folder is not empty (for example contains one or more files or subdirectories), these methods will refuse to remove it. … Continue reading
How to delete file in Java
File management (good old CRUD: create, read, update, delete) is quite common operation in software development. In this short post I would like to present 2 ways of removing files in Java. Method available in every Java version Every Java … Continue reading
Importing WSDL with Java and Maven
SOAP web services are often used in commercial software. If we plan to use existing SOAP web service, we should receive a WSDL file which defines the contract between the web service and its clients. This contract defines at least: … Continue reading
Objects utility class in Java
Today I would like to quickly mention java.util.Objects class. The JavaDoc documentation for this class says: This class consists of static utility methods for operating on objects. These utilities include null-safe or null-tolerant methods for computing the hash code of … Continue reading
Default and static methods in interfaces in Java 8
Before Java 8 interfaces could only contain static fields (usually simple constants) and abstract methods. Java 8 provided the ability to define concrete (default and static) methods in interfaces. This new language feature is used extensively in Java core packages. … Continue reading
Database schema creation in JPA using SQL scripts
Recent versions of JPA provide a feature to automatically create the database objects (like tables, sequences or indexes), load initial data into database on application deployment; and also remove them after the application is undeployed. All that is needed is … Continue reading
Reading text file line by line in Java
Reading text files from hard disk is quite common task in software development practice. Usually we are interested in processing it line by line. In this article I would like to present few popular ways how to do it easily … Continue reading
Iterating through Java list backwards
The most natural method of iterating through a list in Java is to start from the first element of the list and then move forward until the last one is reached. While this is the most common, it is sometimes … Continue reading
Usage of serialVersionUID in Java serialization
Java run-time associates with each serializable class a special version number known as serialVersionUID. This number is later used during deserialization process to verify if the application which performed the serialization and the application which is doing the deserialization have … Continue reading
