Explanation of what Java API is ❓ Types. Examples

When the two most viable and essential application/software development comes together, programmers are allowed to have unmatched functionality. Java API (Application Programming Interface) is the perfect example of how to attain this. Acknowledged as a crucial entity for internal and open development, it is an expedient way to achieve flawless development.

What is Java?

With Java, developers need to invest efforts only once and use the existing code infinite times. Its congeniality with all the commonly used e-devices comes from JVMs or Java Virtual Machines.

It stands second to none when adaptability is considered as it automatically adapts as per the nature of hosting OS.

API in Java

  1. Java compiler: A pre-quoted program used for breaking the complex user-written codes into simple and computer-understandable codes, known as byte-code.
  2. Java Virtual Machine (JVM): Allotted to process the byte code and generate an easy-to-understand output.
  3. Java API: The pre-integrated software components used for establishing a communication between desired software/platforms/components.

Java brings multiple pre-designed components into action for accomplishing the development process. Its API connects to included components and enable programmers to use their functionality so that they can make most of them.

Developers can refer to the classes and packages of available APIs and speed up the process of explaining the classes and packages for the planned program.

The Importance of Using APIs in Java

  • API in Java makes key operational techniques and processes streamlined than ever. The live example of this is The Develop Social Intelligent Inbox. By simply login on to this platform, using Facebook and Twitter, allows one to pay attention to the messages, revert to the tagged posts, and operate on the search items. As the platform is developed using Java API, all these details are presented in a unified view saving time and effort.
  • Use of API in Java grants access to a wide range of SQL support.
  • Java API brings customization of high quality accessible for developers.

The Java REST API work

  • Stateless: REST follows client-server architecture to remain state-independent.
  • Uniform interface: Applications using REST API in Java and beyond will be requiring the undeviating client and server interface via HTTP and URIs
  • Client-server: Client and servers, involved in the communication, are independent of each other.
  • Cache: Cache is an imperative part of REST API in Java as its presence makes recording intermediate responses easier than ever.
  • Layered: REST API features layered structure and each layer is independent.

Types of Java APIs

  1. Public Java APIs are often referred to as open Java API as they are part of JDK and don’t need any extra payment. Also, they are free from the areas and use cases of their implementation.
  2. Private or internal Java API is designed by a particular developer/organization and is accessible only to authorized professionals.
  3. Partner Java APIs are the third-party APIs offered to businesses for specific operations.
  4. Composite Java API is basically microservices developed using clubbing different kinds of APIs.
  5. Web Java API is accessed via HTTP protocol and is used to establish a communication bridge for browser-based applications/services like web storage and web notifications.

Java API example

Let’s take the example of JDBC API. It is the API that lets you access your project’s database and fetch data using various legit queries. It has 2 packages, namely — java.sql and javax.sql.

To use the classes in these packages in your code, you must first import these in the beginning of your file. For this, the code will be:

import java.sql.*
import javax.sql.*

If you want to use a few specific classes from any of these APIs, you can perform the import using following function:

import java.sql.Connection;
import java.sql.SQLException;

In above example, imported classes are SQLException and Connection. These both belong to java.sql package of JDBC API.

Here is an example code that uses data received using the Java JDBC API:

public static void commit() {	
Connection chk_con = this.get();
if (chk_con != null) {
try {
chk_con.commit();
} catch (SQLException e) {
e.printStackTrace();
throw new RuntimeException("Transaction related exception occurred when tried to establish a connection…");
}
}
}

Advantages of API in Java

  • Java APIs keep human involvement as least as possible and empower computers so much that they take care of the entire development job. Java API deploys automaton of highest grade into action and makes crucial workflow quick and error-free.
  • Service delivery is much more flexible with Java APIs as these APIs are available for every component and lift all the data access restrictions. Additionally, the content or code generated using Java API is set to be released and work. All the related channels are allowed to access this freshly-generated content. This makes development quick from the ground level.
  • Java APIs exhibit unmatched integration abilities as they are ready-to-be-embedded in any software/program/website. The high-end integration makes data fluid enough to be used at any platform wherever enhanced user-experience goal fulfillment demands.

Securing APIs in Java

Originally published at https://www.wallarm.com.

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Ivan Novikov

CEO at Wallarm. Application security platform to prevent threats and discover vulnerabilities in a real-time.