1. Standalone Desktop GUI Applications :

• Standalone means it runs int the context of local disk and runtime of the same device (means it will run on single independent device without interacting with other device)
• Eg : VLC Player, Antivirus, Video game, etc.
• Java has provided AWT, Swing and JavaFX to develop the UI rich interactive desktop applications
• IDEs like Netbeans, Eclipse provides the plugins to easily use these components

2. Web Applications :

• Provides support to develop a web application using Servlet, Jsp, Struts, Spring, etc.
• Advantages are security and ease of development while using Java for web dev
• Almost all the banking web applications are developed using the Java( While making any online banking transaction, check the URL, you will find .jsp extension).

3. Mobile Applications :

• Java Micro Edition (Java ME) is a cross-platform framework specially released to build applications that run across all Java supported small devices, including feature phones and smart phones
• The mobile applications for famous smart phone operating system Android can be developed in java using Android Software Development Kit(SDK)

4. Embedded Applications :

• Used in robotics, Television, mobile, SIM Card, Smart Card, etc.
• Blue Ray disk player is one of the devices which 100% uses java only

Why use Java ?

• Open source
• Has huge community support
• Works on different platforms (eg: Windows, MacOS, Linux, RasberryPi, etc.)
• Allows code to be reused
• reduces development costs
• Secure, fast and powerful