JAVA notes

programming language : notification for writing programs.

 numerical language: fortran and algol.
business language cobol
artificial intelligence language lisp and prolog
systems language 
c

 good language should be clear,simple, verifiable,portable.

 programming methodology : 1.unstructured
(speed,not reusable,complext)
2.procedural
(top down C - readable,easy to debug, no data security
bottom up)
object oriented
(modularization,abstraction,encapsulation,composability,hierarchy,continuity)

 oak --> java
(platform independent,simple,robust,portable,secure, multithreaded,dynamic, distributed )

 source code (compiler)-> byte code (executed by JVM) ->(interpreter) machine level interpretation

 java is secure because it prevents unsafe operations, automatic garbage collection, security apis, exception handling, no virus communication 

 phases of java program 
edit, compile, load in primary memory, verify, execute 

 java environment consists of jdk, api

 object is anything that can be represented by data (properties)
methods manipulate the properties of objects

 class is a group of objects with same properties and methods

 modifiers/mutator : changes the value
accessor : returns the value


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