Certificate.java   public class Certificate { private String holder; private int level;   public void setHolderAndLevel(String newHolder, int newLevel) { holder = newHolder; level = newLevel; }       public void print() {         System.out.println("Certificate: " + holder + ", Level: " + level);     } }   -- SOLVE BELOW --   Certificates.java   import java.util.Scanner; import java.util.ArrayList;   public class Certificates { public static void main(String[] args) { Scanner scnr = new Scanner(System.in); ArrayList certificateList = new ArrayList(); Certificate currCertificate; String currHolder; int currLevel; int certificateCount; int i;   certificateCount = scnr.nextInt(); for (i = 0; i < certificateCount; ++i) { currHolder = scnr.next(); currLevel = scnr.nextInt();   currCertificate = new Certificate(); currCertificate.setHolderAndLevel(currHolder, currLevel); certificateList.add(currCertificate); }   /* Your code goes here */   } }

JAVA: Briefly describe (1-2 sentences) each of the following object-oriented programming concepts: Attributes Methods Primitive Data Types vs. Objects Static methods/variables vs. non-static

8) Now use the Rectangle class to complete the following tasks: - Create another object of the Rectangle class named box2 with a width of 100 and height of 50. Note that we are not specifying the x and y position for this Rectangle object. Hint: look at the different constructors) Display the properties of box2 (same as step 7 above). - Call the proper method to move box1 to a new location with x of 20, and y of 20. Call the proper method to change box2's dimension to have a width of 50 and a height of 30. Display the properties of box1 and box2. - Call the proper method to find the smallest intersection of box1 and box2 and store it in reference variable box3. - Calculate and display the area of box3. Hint: call proper methods to get the values of width and height of box3 before calculating the area. Display the properties of box3. 9) Sample output of the program is as follow: Output - 1213 Module2 (run) x run: box1: java.awt. Rectangle [x=10, y=10,width=40,height=30] box2: java.awt.…

Question: Implement a simple expert system using the forward chaining inference method to diagnose medical conditions based on symptoms. The expert system should consist of a knowledge base containing rules and facts about medical conditions and symptoms. The system should be able to infer the possible medical conditions given a set of symptoms provided by the user. Requirements: 1. Define a set of medical conditions, symptoms, and rules in the knowledge base. 2. Implement the forward chaining inference method to infer medical conditions based on symptoms. 3. Allow users to input their symptoms and display the possible medical conditions.