Given the following UML diagram for the Calculator class, and the implementation of the add() and sub() methods, implement two JUnit test cases to test the functionality of the add() and sub() methods. Use the appropriate JUnit annotations and include multiple test cases to verify different scenarios for each method. public static int add(int a, int b) {   return a + b; }public static int sub(int a, int b) {   return a – b; }

Given that numbers is the integer array {0, 0, 0, 10, 10, 10, 20, 20, 20}, how many elements will the set have when i is 5? HashSet values = new HashSet(); for( int i = 0; i < numbers.length; i++ ) values.add( i * numbers );

Which process replaced the Daguerreotype and Talbotype, having the best qualities of both?

Class of hormones that regulates secretions of other endocrine glands.

What was the most common subject matter for early Daguerreotypes?

What is the first thrown exception in the following code? public static void main(String[] args) { try { methodA(); methodB(); methodB(); } catch (Exception e) { System.out.println(“Got this!”); } try { methodB(); methodA(); } catch (Exception e) { System.out.println(“Got this!”); } } public static void methodA() throws Exception { methodB(); throw new ClassNotFoundException();   } public static void methodB() throws Exception { try { methodC(); } catch (FileNotFoundException e ){ throw new ArrayIndexOutOfBoundsException(); } catch (Exception e) { throw new FileNotFoundException(); } methodC(); } public static void methodC() throws Exception { throw new NumberFormatException(); }

How was the Camera Obscura originally used:

Which 17th Century painter is well known for his use of optical devices as drawing aids?   

Which date is generally considered to be the beginning of photography?

Once it was announced, why was photography such an instant success, particularly as a portrait medium? Discuss portrait methods available before photography, which photographic methods were used for portraits, and some of the major early portrait photography practitioners.