JDK

Question 1

What is the JDK and what is its architecture?

Answer 1

The JDK is software that contains all of the necessary components to develop and execute Java programs

Architecture:

• JDK
  
  • Developer tools
    
    • javac: compiles source code into .class files
    • jar: archives .class files into a single file
    • java: starts an application by using the JRE
    • jdb: debugger
    • javadoc: generates documentation from source files
  • JRE
    • JVM
    • Java Core Packages
    • Java Runtime Libraries

Question 2

What is the JVM and what is its architecture?

Answer 2

The JVM is software used to load and execute Java applications

Architecture:

• JVM
  
  • Class Loader
  • Memory
    
    • heap
    • stack
  • Execution Engine
    
    • Interpreter
    • JIT Compiler
    • Garbage collection