Java Application Programming Interface (API) is the part of Java development kit (JDK). An API consists of classes, interfaces, packages along with its methods, fields, and constructors. These inbuilt classes provide the functionalities to a developer. Only developers know that how to implement that class. A user interface provides the simple user interaction between user and computer in the same way the API act as a software program interface which provides interaction between the application and the user. API consists of classes and packages which helps a developer to reduce the lines of code. You can hire freelancers who have knowledge and experience in Java language.
The JDK forms by using three parts such as Java Compiler, Java Virtual Machine (JVM) and Java Application Programming Interface (API). The Java API is the most important part of JDK and describes the functionality of each component. In Programming in Java, the component is already created and used it. Through the Java, API programmer can easily apply the pre written code. The programmers first declare the classes and packages then the programmers can easily invoke the related code of classes and packages for implementation.
Java API has three types depending on their classes, packages, and interfaces. For a bundle of JDK download use official Java Core API. You can download optional official Java APIs if you find them necessary, but it is not compulsory to download them. Unofficial APIs is also known as third-party APIs which downloads from source websites. You can easily find freelance jobs online in this sector
For starting API, it follows three frames. The first frame consists of all API components such as classes and packages. In second frames all interfaces, classes, and exceptions of particular packages are described. The overview of all API packages get describes in the third frame, and that API expands in the main frame for showing the class hierarchy and help sections.
When you are browsing a list of packages from the API then that time you will observe the packages written in GUI programming, networking programming, and managing input and output. If you want to browse that list of packages and their description and classes you have to declare the import statement at the start of the program.
Android API offers android developers rich application framework which allows them to create an extensive app for a mobile device in Java language environment. Through API level integer you can easily express the compatibility of an application. The API level of application described by an application compares with API level of given Android system, and it differs with different Android devices. The API level is a single integer, and you cannot find API level from Android version number. You can hire freelancers who have knowledge and experience in Android development.
Each device has its API, and it has exactly one API. An API level finds your app calls the version of the API set and API set. The Android API plays an important role in finding whether that application is compatible with Android system. The application contains following API level of information. The app is created and run on target API level. You can run your app by using minimum Android API level.
As you know that API is the set of routines, protocols, classes that play an important role in creating the Android applications. The main role of API in Android is that how your application component is interacting. Mostly API plays an important role in graphical user interface components. An API allows the developer to develop a program by providing all building blocks and allows them to use in the program.
In Android API data can be interchanged through XML and JSON. Through this, the mode of transfer is completely language independent, and you can use any language when you have to test your application. You can find freelance jobs online in Android sector.
The Android devices doesnot run the bytecode of Java Archive files. Instead of Java classes, it runs on its bytecode format run on Dalvik platform which is the special virtual machine designed for Android. The Dalvik platform usess less space and a constant pool is modified to use 32-bit indexes which makes an easier interface. The bytecode loaded by Dalvik virtual machine is not Java bytecode because of this it is impossible to load Java Archive file in Android.
The Java API designs the software level functionality, but it also handles hardware level operations. Android API also consists of Java API, and it allows a programmer to use functionality without writing the high level code.
In this article, you get information regarding Java API and Android API and also get a difference between Java API and Android API. API also reduces the work of developer by providing the different classes and interfaces and packages.