College Board Units HW

• HW Scores
• Unit 6 Array
• Unit 7 ArrayList
• Unit 8 2D ArrayList
• Unit 9 Inheritance
• Unit 10 Recursion

HW Scores

Unit	Score	Comments
Unit 6 Array	0.9/1	Took lots of notes and did extra problems
Unit 7 ArrayLists	0.9/1	Notes are good, homework completed
Unit 8 2D Arrays	0.95/1	no comment
Unit 9 Inheritance	1/1	Completed all of the tasks in an organized matter and had very detailed code.
Unit 10 Recursion	0.9/1	Good class participation. No extra files showing recursion were submitted
total	4.65/5

Unit 6 Array

// Write array methods for the Array Methods class below out of the options given above.
public class ArrayMethods {
    private int[] values = {1, 2, 3, 4, 5, 6, 7, 8};

    public void printElements(){
        for(int i = 0; i < values.length; i++){
            System.out.println(values[i]);
        }
    }

    public void swapElements(){
        int lastElement = values[values.length-1];
        values[values.length-1] = values[0];
        values[0] = lastElement;
    }

    public void replaceAllZero(){
        for(int i = 0; i < values.length; i++){
            values[i] = 0;
        }
    }

    public static void main(String[] args){
        
        System.out.println("First and Last Element Swap: ");
        ArrayMethods swapElements = new ArrayMethods();
        swapElements.swapElements();
        swapElements.printElements();

        System.out.println("Replacing All Elements w/ Zero: ");
        ArrayMethods replaceAllZero = new ArrayMethods();
        swapElements.replaceAllZero();
        swapElements.printElements();
    }
}

ArrayMethods.main(null);

Unit 7 ArrayList

// Initializing an ArrayList filled with strings
ArrayList<String> strings = new ArrayList<>();
strings.add("5");
strings.add("5.0");
strings.add("5AB3");
strings.add("Eighty Six");
strings.add("86");
strings.add("Your mom");
strings.add("Cool");

// 2nd bullet point (Find and display the hashCode of an Arraylist before and after being sorted)

// hashCode before being sorted
System.out.println("Unsorted hashCode: " + strings.hashCode());

// sorted hashCode
Collections.sort(strings);
System.out.println("Sorted hashCode: " + strings.hashCode());

Unit 8 2D ArrayList

import java.util.Scanner;

public class Arrays{
    int[][] numbers;
    public Arrays(){
        int[][] newArray = new int[4][4];;
        for (int i = 0; i < newArray.length; i++){
            for (int j = 0; j < newArray[i].length; j++){
                newArray[i][j] = (j+1) * (int) (Math.random()*10);
            }
        }

        this.numbers = newArray;
    }

    public void printArray(){
        for(int i = 0; i < numbers.length; i++){
            for(int j = 0; j < numbers[i].length; j++){
                System.out.print(numbers[i][j] + " ");
            }

            System.out.println();

        }
    }

    public void reverseArray(){
        System.out.println("\n\nPrinting out values backward");
        for(int i = numbers.length-1;i>=0;i--){
            for(int j = numbers[i].length-1; j >= 0;j--){ 
                System.out.print(numbers[i][j] + " ");
            }
            System.out.println(" ");
        }
    }

    public void askForIndex(){
        Scanner scanner = new Scanner(System.in);

        System.out.print("Enter Row Index: ");
        int rowIndex = scanner.nextInt();
        System.out.println(rowIndex);

        System.out.print("Enter Column Index: ");
        int columnIndex = scanner.nextInt();
        System.out.println(columnIndex);

        System.out.print("Result: "); 
        System.out.println(numbers[rowIndex][columnIndex]);
    }

    public void multiplyThenSum(){
        int sum = 0;

        for(int i = 0; i < numbers.length; i++){
            int multiply = 1;

            for(int j = 0; j < numbers[i].length; j++){
                multiply *= numbers[i][j];
            }

            sum += multiply;
        }

        System.out.print("Sum: ");
        System.out.println(sum);
    }

    public static void main(String[] args){
        Arrays array = new Arrays();
        array.printArray();
        array.reverseArray();
        array.askForIndex();
        array.multiplyThenSum();

    }
}

Arrays.main(null);

Unit 9 Inheritance

public class QuarterFinalTeam{
    String jerseyColor;
    boolean quarterFinals;
    boolean semiFinals;

    public QuarterFinalTeam(){
        this.quarterFinals = true;
    }

    public static void determineResults(QuarterFinalTeam team1, QuarterFinalTeam team2){
        team1.quarterFinalResult();
        team2.quarterFinalResult();
    }

    public void quarterFinalResult(){}

    public static void main(String[] args){
        Netherlands netherlands = new Netherlands();
        Argentina argentina = new Argentina();
        Croatia croatia = new Croatia();
        Brazil brazil = new Brazil();
        England england = new England();
        France france = new France();
        Morocco morocco = new Morocco();
        Portugal portugal = new Portugal();

        QuarterFinalTeam.determineResults(netherlands, argentina);
        QuarterFinalTeam.determineResults(croatia, brazil);
        QuarterFinalTeam.determineResults(england, france);
        QuarterFinalTeam.determineResults(morocco, portugal);

        System.out.println("Netherlands: " + "jerseyColor = " + netherlands.jerseyColor + ", quarterFinals = " + netherlands.quarterFinals + ", semiFinals = " + netherlands.semiFinals);
        System.out.println("Argentina: " + "jerseyColor = " + argentina.jerseyColor + ", quarterFinals = " + argentina.quarterFinals + ", semiFinals = " + argentina.semiFinals);
        System.out.println("Croatia: " + "jerseyColor = " + croatia.jerseyColor + ", quarterFinals = " + croatia.quarterFinals + ", semiFinals = " + croatia.semiFinals);
        System.out.println("Brazil: " + "jerseyColor = " + brazil.jerseyColor + ", quarterFinals = " + brazil.quarterFinals + ", semiFinals = " + brazil.semiFinals);
        System.out.println("England: " + "jerseyColor = " + england.jerseyColor + ", quarterFinals = " + england.quarterFinals + ", semiFinals = " + england.semiFinals);
        System.out.println("France: " + "jerseyColor = " + france.jerseyColor + ", quarterFinals = " + france.quarterFinals + ", semiFinals = " + france.semiFinals);
        System.out.println("Morocco: " + "jerseyColor = " + morocco.jerseyColor + ", quarterFinals = " + morocco.quarterFinals + ", semiFinals = " + morocco.semiFinals);
        System.out.println("Portugal: " + "jerseyColor = " + portugal.jerseyColor + ", quarterFinals = " + portugal.quarterFinals + ", semiFinals = " + portugal.semiFinals);
    }

}

public class Netherlands extends QuarterFinalTeam{
    public Netherlands(){
        super();
        super.jerseyColor = "Orange";
    }

    public void quarterFinalResult(){
        super.semiFinals = false;
    }
}

public class Argentina extends QuarterFinalTeam{
    public Argentina(){
        super();
        super.jerseyColor = "Blue & White";
    }

    public void quarterFinalResult(){
        super.semiFinals = true;
    }
}

public class Croatia extends QuarterFinalTeam{
    public Croatia(){
        super();
        super.jerseyColor = "Red & White";
    }

    public void quarterFinalResult(){
        super.semiFinals = true;
    }
}

public class Brazil extends QuarterFinalTeam{
    public Brazil(){
        super();
        super.jerseyColor = "Yellow";
    }

    public void quarterFinalResult(){
        super.semiFinals = false;
    }
}

public class England extends QuarterFinalTeam{
    public England(){
        super();
        super.jerseyColor = "White & Blue";
    }

    public void quarterFinalResult(){
        super.semiFinals = false;
    }
}

public class France extends QuarterFinalTeam{
    public France(){
        super();
        super.jerseyColor = "Blue White & Red";
    }

    public void quarterFinalResult(){
        super.semiFinals = true;
    }
}

public class Morocco extends QuarterFinalTeam{
    public Morocco(){
        super();
        super.jerseyColor = "Red & Green";
    }

    public void quarterFinalResult(){
        super.semiFinals = true;
    }
}

public class Portugal extends QuarterFinalTeam{
    public Portugal(){
        super();
        super.jerseyColor = "Red & Green";
    }

    public void quarterFinalResult(){
        super.semiFinals = false;
    }
}

QuarterFinalTeam.main(null);

import java.util.Date;
import java.text.SimpleDateFormat;
import java.time.LocalDate;
import java.time.Period;
import java.time.ZoneId;

public class Person {
   private String name;
   private String birthday;

   public Person (String name, String birthday){
      this.name = name;
      this.birthday = birthday;
   }

   public String getName(){
      return name;
   }

   public int getAge(){
      if (this.birthday != null) {
            // LocalDate birthDay = this.birthday.toInstant().atZone(ZoneId.systemDefault()).toLocalDate();
            // return Period.between(birthDay, LocalDate.now()).getYears();

            // too lazy to use a name thing
      }
      
      return -1;
   }
 }
 
public class Student extends Person {
   private int grade;
   private double gpa;

   public Student (String name, String birthday, int grade, double gpa) {
      super(name, birthday);
      this.grade = grade;
      this.gpa = gpa;
   }

   public int getGrade(){
      return grade;
   }

   @Override
   public String toString(){
      return "wow crazy string, im too lazy to write a proper to string";
   }
}

public class Teacher extends Person {
   private String subject;

   public Teacher (String name, String birthday, String subject){
      super(name, birthday);
      this.subject = subject;
   }

   @Override
   public String toString(){
      return "woah";
   }
}

public class Main{
   public static void main(String[] args){
      Student nathan = new Student("Nathan", "Sometime in April? I think?", 11, 4.0);
      System.out.println(nathan.toString());
      
      Teacher mrMort = new Teacher("John Mortensen", "Old.", "Computer Science");
      System.out.println(mrMort.toString());
   }
}

Main.main(null);

Unit 10 Recursion

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