Java is a general-purpose, class-based, object-oriented programming language designed for having lesser implementation dependencies. It is a computing platform for application development. Java is fast, secure, and reliable, therefore. It is widely used for developing Java applications in laptops, data centers, game consoles, scientific supercomputers, cell phones, etc.
You can found java at: java
you can found how to install java at: java-jdk
for run the program, you can use the command:
java Hello.java
if you are add java to your path