The default Java method introduced from Java 8 is to enable the ability to extend, improve an existing interface without breaking the previously implemented interface. How is it in details? Let’s learn together in this tutorial! OK, let’s start with the following example. For example,… Read More
In the Lambda Expression tutorials, I introduced you to the Functional Interface and its importance when using Lambda Expression in Java code. In this tutorial, I will talk more about Functional Interface! Definition of Functional Interface OK, let me first talk about the definition of… Read More
In this tutorial, I will guide you how to install an FTP server on Ubuntu using the vsftpd library. First, you need to run the following command to update the packages in the Ubuntu repository:
|
1 |
sudo apt-get update |
Then run the following command to install the vsftpd library:… Read More
Generics are a function of Java that allows programmers to specify the type of data they want to work with in a class, interface, or method. In this tutorial, let’s learn more about generics in Java. Why need generics? Before generics is introduced, we only… Read More
Check out the full series of Questions Management tutorial here. So we have completed the basic functions and operations that an application that manages multiple-choice questions needs to have. Now is the time to review to edit and remove the unnecessary parts that originally deliberately retained.… Read More
Check out the full series of Questions Management tutorial here. After building the updating option for the Frontend, now is the time to perform the deletion operation for this option. First, I will add a method to OptionsService class that will allow us to call the… Read More
In Java, in addition to the StringBuilder object, we also have a StringBuffer object with the same functionality as the StringBuilder object, but in reality it is thread-safe. This means that only one thread can access our StringBuffer object at a time. Thread-safe ensures that… Read More
Check out the full series of Questions Management tutorial here. In the previous tutorial, we prepared all the necessary configurations to be able to construct API delete option such as an object containing all the information of an Option; a CoreOptionService interface with the implementation CoreOptionServiceImpl… Read More
Check out the full series of Questions Management tutorial here. In the previous tutorial, we prepared all the necessary configurations to be able to build API deletion option such as an Option document object containing the information of an option, an OptionRepository to manipulate MongoDB, an OptionController defines APIs for… Read More
In addition to the charAt(), indexOf(), substring(), length() methods that work in the String object, StringBuilder has other main methods that we’ll cover in the following: The append() method adds a value at the end of the current string of the StringBuilder object. We can… Read More
