Reviewing concepts and taking notes on Java primitives data types casting and memory usage

Primitives data types size

Primitives data types casting

Variable assignment

public static void main(String[] args){

  int firstValue = 9;
  
  int secondValue = 5;
  
  System.out.println(firsValue); // Prints 9

  firstValue = secondValue;
  
  System.out.println(firstValue); // Prints 5
  
  secondValue = 11;

  System.out.println(firstValue); // Prints 5

}        

Note: Java doesn't pass pointers to the variable assignment, instead, it passes just the value during assignment.