1.Uber
     A leading ride-sharing application that connects drivers 
  and passengers. Its backend services are developed using Java 
  to handle high volumes of data and transactions efficiently.

 2.Jenkins
        Jenkins, an open-source automation server, is primarily 
  written in Java and is widely used for continuous integration 
  and continuous delivery (CI/CD) in software development.

 3.Minecraft 
       A popular sandbox game that allows players to build and 
  explore virtual worlds. Its original version was developed 
  using Java. 

 4.Spotify
         A music streaming service that employs Java in its 
  backend to manage user data and streaming services 
  effectively.

 5.Netflix
        Netflix extensively utilizes Java in its technology 
  stack to build and maintain its streaming platform.

 6.Twitter
       Twitter's architecture has evolved significantly to meet 
  the demands of its growing user base. Initially built using 
  Ruby on Rails, Twitter transitioned to Java and Scala to 
  enhance performance and scalability. This shift allowed 
  Twitter to handle higher request rates and improve system 
  reliability

 7.Android Operating system
               The world's most widely used mobile operating 
   system, Android, is primarily built using Java. This enables 
   developers to create a vast array of mobile applications. 


 8.NASA WorldWind
               NASA WorldWind is an open-source 3D virtual 
  globe SDK developed by NASA's Learning Technologies project. 
  It enables developers to create cross-platform geospatial 
  applications in Java, providing access to a vast array of 
  satellite imagery, terrain data, and other geospatial        
  information.

 9.Citibank
          Citibank employs Java extensively across its 
  technology infrastructure to develop and maintain various 
  financial applications and services. The bank's technology 
  stack includes Java, among other languages and tools, to 
  support its global operations. 

 10.Walmart
       Walmart extensively utilizes Java in its technology 
  infrastructure to develop and maintain various applications 
  and services. The company employs Java for building scalable, 
  high-performance systems that support its global retail 
  operations.