JVM (Java Virtual Machine)

Runs Java bytecode (like the engine):

• Loads .class (bytecode)

• Verifies bytecode (security)

• Executes code

• Manages memory (Heap, Stack)

• Runs Garbage Collector

• Handles threads

• Have a predefined calling method:

  public static void main(string[] args)
  // can overload main method
  // predefined is to call this
  // JVM calls it based on class name (so must be static)
  

Platform-specific

• Windows JVM
• Linux JVM
• macOS JVM

// But bytecode is the same.

JRE (Java Runtime Environment)