1.1 History of Java

Java developed by Sun microsystem which lead by Mr. James Gosling.

The motive to develop java is to create something which is platform independent.

Initially it is developed for electronic appliances like set top boxes and called as "GREEN TALK".

later it is known as "Oak(1991)"

Java got patent in 1993 and later launched its first version in 1995.

The main feature of this programming language is Platform independent.

Code (.java) --> compiler will compile it into .class file which is a byte code. 

This byte code will run into JVM.

So it is must to have JVM to run any java code. By default windows, linux provides JVM.