Readme file changes

Author: RahulSinghParmar

JavCore.jpg

@@ -1,6 +1,52 @@
 # JAVA-Core
 Simple examples done using Java OOP concepts
 
-* ds
+![JAVA-Core](JavCore.jpg)
 
-![JAVA-Core](JavaCore.jpg)
+### Section 1
+* Introduction to programming 
+* Introduction to java 
+* JDK installation 
+* Keywords, Identifiers, variables 
+* Operators 
+* Method/Functions 
+* Flow Control Statements 
+* Arrays 
+* Strings 
+* Interactive programs in java using Scanner
+
+### Section 2
+#### Object Oriented Programming System
+- Classes and Objects
+- Object creation
+- Reference variable
+- Global and local variables
+- Constructors
+- Aggregation
+- Composition
+- Inheritance 
+- Method Overloading
+- Method Overriding
+- Abstract classes
+- Interfaces
+- Typecasting
+- JVM architecture
+- Polymorphism
+- Abstraction
+- Java packages
+- Access Specifies
+
+### Section 3
+####  Java Built-in packages and API
+* Overview of java API
+* Object class
+* String, String Buffer and String Builder
+* Exception Handling
+* Threads and multithreading
+* Wrapper Classes
+* Data Structures
+* JAVA COLLECTION FRAMEWORKS
+* File Handling
+* Serialization
+* Garbage Collector
+* Encapsulation