Why won't the program include the first input from the user in the calculation of the average?

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• Having Problem With Click Listener in Java

  I'm making a chess-like game in java and I'm having an issue with the click events. The mouseClicked function isn't responding to my clicks on the window and for no apparent reason.

  I have already tried a few things such as changing class names and using different functions but nothing has worked.

  package main.game.com;
  
  import java.awt.event.MouseAdapter;
  import java.awt.event.MouseEvent;     
  
  public class ClickEvent extends MouseAdapter {
  
      public void mouseClicked(MouseEvent e) {
              System.out.println("hello");
      }
  
  }
  

  ---

  package main.game.com;
  
  import java.awt.Canvas;
  
  public class Main extends Canvas {
  
      private static final long serialVersionUID = 1673528055664762143L;
  
      private static final int WIDTH = 416, HEIGHT = 439;
  
      public Main() {
          Window window = new Window(WIDTH, HEIGHT, "DARRAGH", this);
          this.addMouseListener(new ClickEvent());
      }   
  

  ---

  package main.game.com;
  
  import java.awt.Canvas;
  import java.awt.Dimension;
  
  import javax.swing.JFrame;
  
  public class Window extends Canvas {
  
      private static final long serialVersionUID = 6733885629776844621L;
  
      public Window(int width, int height, String title, Main main) {
  
          JFrame frame = new JFrame(title);   
  
          frame.setPreferredSize(new Dimension(width, height));
          frame.setMaximumSize(new Dimension(width, height));
          frame.setMinimumSize(new Dimension(width, height));
  
          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          frame.setResizable(false);
          frame.add(main);
          frame.setVisible(true);
          main.start();
  
      }
  }
  

  The first set of code is my mouseAdapter library and the second is the first part of my main class containing the clickListener.
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• Detect last item in a group inside a loop

  I am looping over a collection of benefit codes. Each code is assigned a type such as medical or dental. If the employee purchased that benefit, then I include it in the list. If they purchased no dental benefits, we want to add an item to the list for dental that indicates not purchased.

  My AppConstants looks like so...

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      {"EE DENT INS", "Dental", "Employee"},
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  Method looks like this...

  private List<BenefitEnrollment> getAllEnrollments(Map<String, BenefitEnrollment> currentEnrollmentForDriver) {
  
      List<BenefitEnrollment> allEnrollments = new ArrayList<BenefitEnrollment>();
  
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      // loop through two dimensional array that holds the benefit codes with description
      for(int i=0; i < AppConstants.knightBenefitCodes.length; i++) {
          String benefitDescription = AppConstants.benefitCodes[i][0];
          String benefitDisplayTitle = AppConstants.benefitCodes[i][1];
          String benefitCoverage = AppConstants.benefitCodes[i][2];
  
          // create the object
          BenefitEnrollment benefit = new BenefitEnrollment();
          benefit.setDescription(benefitDescription);
          benefit.setDisplayTitle(benefitDisplayTitle);
  
          // check if the current driver is enrolled in benefit
          boolean hasBenefit = currentEnrollmentForDriver.containsKey(benefitDescription);
  
          if(hasBenefit) {
              benefit.setCoverage(benefitCoverage);
              benefit.setAmount(currentEnrollmentForDriver.get(benefitDescription).getAmount());
              benefit.setEnrolled(true);
  
              allEnrollments.add(benefit);
          }
  
  //          else if (...) {   // need condition that adds item when nothing in say Dental purchased
  //              benefit.setCoverage("none");
  //              benefit.setAmount(0.00);
  //              benefit.setEnrolled(false);
  //              
  //              allEnrollments.add(benefit);
  //          }           
      }
  
      return allEnrollments;
  }
  

  I tried various things with little to no success. Tried checking previous benefitDisplayTitle vs current one, tried flipping the if else. Seem to have gone down a rabbit hole. I get duplicates of data. I get Dental multiple times, Medical multiple times. Each should only occur once in the final output.
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• Do-while to calculate largest and smallest, stop while reading exit number as a smallest?

  I recently started Java programming module at university (2 weeks ago).

  One of our tasks is "to use a do-while loop to read numbers from the user and find the smallest and the largest values when the user enters '-1' the loop should end and the final largest and smallest numbers should be printed."

  I'm pretty much there, through reading lecture notes and a tonne of docs online - my current code gives me the largest number but I'm getting slightly confused with my while expression:

  How do I stop the program printing -1 as the smallest number? I would like -1 to be read as the number to exit the loop ONLY.

  import java.util.Scanner;
  
  public class Task4 {
  
      public static void main(String [] args){
  
          int num =0;
          int min= Integer.MIN_VALUE;
          int max= Integer.MAX_VALUE;
  
          min = num;
          max = num;
  
          Scanner kb = new Scanner(System.in);
  
          do {
              System.out.print("Enter string of numbers, type -1 to quit.:");
              num = kb.nextInt();
  
              if (num > max)
              {
                  max = num;
              }
              else if (num < min) 
              {
                  min = num;
              }
  
          }
  
          while (num !=-1);
          System.out.println("Smallest =" + min);
          System.out.println("Largest = " + max);
      }
  
  }
  
• How can I exclude -1 from this do…while loop?

  The program is supposed to calculate the average of numbers entered until -1, but my code calculates the average with -1 included.

  How can I exclude -1 from being calculated to the sum and average?

  #include <stdio.h>
  #include <stdlib.h>
  
  int main() {
    int n;
    int sum = 0, i = 0;
    float av;
    do {
      scanf("%d", &n);
      sum += n;
      i++;
    } while (n != -1);
    av = (float)sum / i;
    printf("%f", av);
    return 0;
  }
  
• Preventing an infinite loop in do while loop with scanner?

  The following code has a few issues I've noticed. It seems to accept any value for time, and most importantly it cannot get out of the loop asking for language. I think I am using either scanner or do while loops improperly?

  import java.io.File;
  

  import java.util.Scanner;

  public class Personal { public static void main(String[] args) {

          String[][] greet = new String[][]{      //possible greetings
              {"Good morning", "Good afternoon", "Good evening"},
              {"Zhaoshang hao", "Xiawu hao", "Wanshang hao"},
              {"Bom dia", "Boa tarde", "Boa noite"},
              {"Habari ya asubuhi", "Habari ya mchana", "Habari ya jioni"}};
  
          int time = -1;
          String language = "a";
          String name = "";
          int row = 0;
          int column = 0; //row and column are used for indexing to get the correct greeting
  
          Scanner input = new Scanner(System.in); //to read user input
          boolean go = true;
          while (go) {
              System.out.println("What is your name?");
              name = input.next();
              if (name == "Yap" || name == "Chandu") {go = false;} //end conditions
              do {
                  System.out.println("What time is it? (Enter an integer from 0 to 23 that is closest.)");
                  while (!input.hasNextInt()) { //checking for right data type
                      System.out.println("That's not an integer!");
                          input.next();
                  }
              time = input.nextInt();
              } while (time < 0 && time > 23); //does loop while time isn't in correct range
              do {
              //while (language != "English" || language != "english" || language != "Chinese" || language != "chinese" || language != "Portuguese" || language != "portuguese" || language != "Swahili" || language != "swahili"){ //iterates while language is not on list
                  System.out.println("What is your language? (English, Chinese, Portuguese, Swahili)");
                  input.nextLine();
                  language = input.next();
  
              } while (language != "English" || language != "english" || language != "Chinese" || language != "chinese" || language != "Portuguese" || language != "portuguese" || language != "Swahili" || language != "swahili"); //iterates while language is not on list
          }
  
          if (language == "English" || language == "english") {row = 0;}
          if (language == "Chinese" || language == "chinese") {row = 1;}
          if (language == "Portuguese" || language == "portuguese") {row = 2;}
          if (language == "Swahili" || language == "swahili") {row = 3;}
  
          if (time >=4 || time <= 12) {column = 0;}
          else if (time >=13 || time <= 18) {column = 1;}
          else {column = 2;}
  
          System.out.println(greet[row][column] + " " + name + "!");  
  
  
      }//main
  }