Basics-of-Java (Java + OOPs)

Java - "portable language" (write once, run anywhere).

JVM vs JRE vs JDK

• Java Virtual Machine (JVM)

  • The Java Virtual Machine (JVM) is the virtual machine that runs the Java bytecodes (.class files) as interpreted languages.
  • platform dependant

• Java Runtime Environment (JRE)

  • JRE provides the libraries, the Java Virtual Machine, and other components to run applets and applications written in the Java programming language
  • JRE = JVM + Libraries

• Java Development Kit (JDK)

  • JDK = JRE + Compilers + Debuggers

Oracle JDK and the OpenJDK :

• Oracle JDK is the official Java Development Kit for Oracle.
• OpenJDK is a community-supported open source implementation of the Java programming language.

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1. Basics of Java
2. Collection-Framework
3. Multi-Threading
4. Generics
5. Lambda
6. Unit-Testing
7. Reflection
8. Asynchronous
9. Log-System
10. Parallel-Streams