There are too many Java technologies to list in one article, so this article will describe only the ones most frequently used. The number of technologies listed here can appear overwhelming. Keep in mind that you will not need to use them all. In fact, a web application often consists of nothing more than one page created with the JavaServer Pages (JSP) technology. Sometimes you will combine three or more such technologies. No matter how many you end up using, it's good to know what is available to you and how you can use each one in a web application.
Java is a programming language and computing platform first released by Sun Microsystems in 1995. There are lots of applications and websites that will not work unless you have Java installed, and more are created every day. Java is fast, secure, and reliable. From laptops to datacenters, game consoles to scientific supercomputers, cell phones to the Internet, Java is everywhere!
Java is called platform independent because of its byte codes which can run on any system irrespective of its underlying operating system.
Wrapper classes convert the Java primitives into the reference types (objects). Every primitive data type has a class dedicated to it. These are known as wrapper classes because they “wrap” the primitive data type into an object of that class. Refer to the below image which displays different primitive type, wrapper class and constructor argument.
Java doesn’t use pointers because they are unsafe and increases the complexity of the program. Since, Java is known for its simplicity of code, adding the concept of pointers will be contradicting. Moreover, since JVM is responsible for implicit memory allocation, thus in order to avoid direct access to memory by the user, pointers are discouraged in Java.
Object-oriented programming or popularly known as OOPs is a programming model or approach where the programs are organized around objects rather than logic and functions. In other words, OOP mainly focuses on the objects that are required to be manipulated instead of logic. This approach is ideal for the programs large and complex codes and needs to be actively updated or maintained.
In Java, string objects are immutable in nature which simply means once the String object is created its state cannot be modified. Whenever you try to update the value of that object instead of updating the values of that particular object, Java creates a new string object. Java String objects are immutable as String objects are generally cached in the String pool. Since String literals are usually shared between multiple clients, action from one client might affect the rest. It enhances security, caching, synchronization, and performance of the application.
Association is a relationship where all object have their own lifecycle and there is no owner. Let’s take the example of Teacher and Student. Multiple students can associate with a single teacher and a single student can associate with multiple teachers but there is no ownership between the objects and both have their own lifecycle. These relationships can be one to one, one to many, many to one and many to many.
Dusan, I had to leave the workshop early so I didn't get a chance to say goodby or thank you and Rod for the terrific job you did. I am assuming that Leilani will get you a copy of the evaluations which were all really great to excellent. I just want to acknowledge both of you for the work you have done to be able to have that conversation with people in the way you do. I fully appreciate what it takes to get outside all your personal concerns and issues to be able to.
SRsnt compliment to her justice work. I know of this sensitivity because we also served together as hospice volunteers. Susan is always willing to listen to the perspectives of others and open to sharing her experiences with others to uplift and encourage. She is generous, always giving much more than is given to her.
The messenger is the message, and in this very good book, we find important messages that sadden, excite and affirm us as people who celebrate both our sexuality and our spirituality. Unitarian Universalists should feel very proud of having created a safe harbor for those discarded by others, and also challenged to work harder to make its culture more welcoming and inclusive.
These personal stories will persuade even the most cynical that religion can be a force that is fully accepting and transforming. Indeed, the fulfillment of religion’s true promise is found among those who have courageously spoken here.
