A powerful high-level programming language is the Java programming language. It is an Object-oriented Programming language. Java programming language is robust. Java is developed by sun microsystems and the father of Java is James Gosling. Java programming language is used for the development of desktop applications like acrobat reader, media players, anti-virus, etc. Java too used to develop web applications. The applications of Java extends to banking applications, mobile applications (Especially Android), Embedded systems, and Smart card. Robotics, Games, etc. Java applications can be classified into 4 types:
- Standalone Application
- Web Application
- Enterprise Application
- Mobile Application
Stand-alone applications are windows based applications. They are desktop applications. Stand-alone applications are traditional applications. Web applications are applications that run on behalf of the server-side. Enterprise applications are distributed applications. Banking applications are an example of enterprise applications. And applications created exclusively for mobiles are mobile applications. Java programming is used for the development of the android mobile application.
Variables in Java
In programming, there is huge data that have to be dealt with. A variable in a programming language means a value. This value can be changed based on the conditions or based on the information. A program consists of a set of instructions to the computer which insists on what to do. The data consists of two types of values. One is a constant value and the other is variable. Constant values or fixed values are the value that will never change. But in the case of Variables that will be changed based on the conditions. The values may be expressed in decimal numbers or a string of text characters. They are usually limited in length.
In Java, a variable is defined as a container that holds the value while the program is executed. It is assigned along with a data type. VAriable can also be expressed as the name of memory. Three types of variables are there in Java. They are:
- Local Variable
- Instance Variable
- Static Variable
There are methods in the Java programming language. If a variable is declared inside the body of the method, then it is called a Local variable. Other variables in the same class don’t know that this variable exists. This cannot be defined with a static keyword. When a variable is declared outside the body of a method but inside the body of a class is termed an Instance variable. The instance variable is also not declared as static. If a variable is declared as static, then it is called a static variable.
Final Variables in Java and Its Uses
The value of the variable cannot be changed after we declared it with a final keyword. We cannot try to change the value of a final variable. If we try to change the value of a final variable then it will become a compilation error. This happens for a normal variable which is declared with a final keyword. A final variable can only be defined or declared only after giving an initial value. If it is declared without giving an initial value, it will become a blank value. It is mandatory to initialize a final variable. It can be done either during the declaration or after the declaration. It will be a compilation error if we left the variable uninitialized.
The difference between normal and final variables is about only one parameter. That the normal variable can be changed even after we assign the value and in the case of the final variable it cannot be changed once assigned. The final variable in Java is mainly used for one purpose. The main use of the Final variable in java is assigning values that the user wants to remain constant. This has to remain constant throughout the execution of the program.
Java programming language is one high-level language that is beginner-friendly. There are values in objects. These values are termed variables. Variables are of different types in Java. The final Variable is one important variable. Once a value is assigned it can be changed in a final variable.
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