Updates (#2)

* Session 8 minor changes

* Session3 Answers added

* Session4 code Rebasing

* Session 4 Minor Corrections

* Session5 minor Changes

Session3/Group/school/Driver.java

@@ -0,0 +1,12 @@
+package school;
+
+public class Driver{
+    public static void main(String ar[]){
+        School sc1 = new School("School ABC", "Colombo Road, Kandy", 5);
+        sc1.addStudent("Student 1", 16, 3.2);
+        sc1.addStudent("Student 2", 18, 3.8);
+        sc1.addStudent("Student 3", 16, 2.7);
+
+        sc1.display();
+    }
+}

Session3/Group/school/School.java

@@ -0,0 +1,57 @@
+package school;
+
+import student.Student;
+
+public class School{
+    private String sName;
+    private String address;
+    private Student students [];
+
+    public School(String sn, String ad, int scount){
+        this.sName = sn;
+        this.address = ad;
+        this.students = new Student[scount];
+    }
+
+    public void setName(String name){
+        this.sName = name;
+    }
+
+    public String getName(){
+        return this.sName;
+    }
+
+    public void setAddress(String addr){
+        this.address = addr;
+    }
+
+    public String getAddress(){
+        return this.address;
+    }
+
+    public void addStudent(String name, int age, double gpa){
+        for(int i =0; i< students.length; i++){
+            if(i == students.length-1 && students[i] != null){
+                System.out.println("Students full");
+                break;
+            }
+            if(students[i] == null){
+                students[i] = new Student(name, age, gpa);
+                break;
+            }
+        }
+    }
+
+    public void display(){
+        System.out.println("School Name: " + this.sName + "\nAddress: " + this.address + "\nStudent Details: ");
+        for(Student s : students){
+            if(s != null){
+                s.display();
+            }
+            System.out.println("");
+        }
+        if(students[0] != null)
+            System.out.println("Average GPA: " + students[0].calAverage(students));
+    }
+
+}

Session3/Group/school/student/Student.java

@@ -0,0 +1,53 @@
+package student;
+
+public class Student{
+    private String name;
+    private int age;
+    private double gpa;
+
+    public Student(String n, int a, double g){
+        this.name = n;
+        this.age = a;
+        this.gpa = g;
+    }
+
+    public void setName(String nme){
+        this.name = nme;
+    }
+
+    public String getName(){
+        return this.name;
+    }
+
+    public void setAge(int ag){
+        this.age = ag;
+    }
+
+    public int getAge(){
+        return this.age;
+    }
+
+    public void setGPA(double gp){
+        this.gpa = gp;
+    }
+
+    public double getGPA(){
+        return this.gpa;
+    }
+
+    public double calAverage(Student s []){
+        double avg = 0.0;
+
+        for (Student stu : s){
+            if(stu != null)
+            avg += stu.getGPA();
+        }
+        return avg/s.length;
+
+    }
+
+    public void display(){
+        System.out.println("Name: " + this.name + "\nAge: " + this.age + "\ngpa: " + this.gpa);
+    }
+
+}

Session3/Individual/Main.java

@@ -0,0 +1,32 @@
+package Individual;
+
+import Individual.matrix.Matrix;
+
+public class Main
+{
+    public static void main(String[] args)
+    {
+        Matrix m1 = new Matrix(2, 3);
+        m1.init_matrix();
+        m1.print();
+        System.out.println("-----------------------------------------------");
+
+        Matrix m2 = new Matrix(2, 3);
+        m2.init_matrix();
+        m2.print();
+        System.out.println("-----------------------------------------------");
+
+        Matrix m3 = new Matrix(1, 2);
+        m3.init_matrix();
+        m3.print();
+        System.out.println("-----------------------------------------------");
+
+        System.out.println("m1 + m2: ");
+        m1.add_matrix(m2);
+        System.out.println("-----------------------------------------------");
+
+        System.out.println("m1 + m3: ");
+        m1.add_matrix(m3);
+        System.out.println("-----------------------------------------------");
+    }
+}

Session3/Individual/matrix/Matrix.java

@@ -0,0 +1,100 @@
+package Individual.matrix;
+
+import java.util.Arrays;
+import java.util.Scanner;
+
+/**
+ * The Matrix class represents a matrix using a 2D Java array.
+ *
+ * A Matrix object will have set dimensions defined at creation time.
+ */
+public class Matrix
+{
+    double[][] matrix;
+    Scanner scanner = new Scanner(System.in);   // Not required in the assignment, but will be used to test the program.
+
+    /**
+     * The constructor method.
+     *
+     * Creates a Matrix object containing an array of the specified dimensions
+     * @param m Number of rows of the matrix.
+     * @param n Number of columns of the matrix.
+     */
+    public Matrix(int m, int n)
+    {
+        this.matrix = new double[m][n];
+    }
+
+    /**
+     * Method to print out the Matrix.
+     */
+    public void print()
+    {
+        // We will be using two nested loops to access each element of the 2D array. The first loop iterates through
+        // rows, while the second loop iterates through the columns. "matrix.length" yields the number of rows and
+        // "matrix[i].length" yields the number of columns in row i.
+        for (int i = 0; i < this.matrix.length; i++)
+        {
+            for (int j = 0; j < this.matrix[i].length; j++)
+            {
+                System.out.print(this.matrix[i][j] + " "); // Note the use of the print method instead of the println
+                                                            // method.
+            }
+            System.out.println(); // Print a new line at the end of each row.
+        }
+    }
+
+    /**
+     * Method to get the dimensions of the matrix of the Matrix object.
+     * @return Integer array containing the dimensions of the matrix.
+     */
+    public int[] get_dimensions()
+    {
+        int[] dims = new int[2];
+        dims[0] = this.matrix.length;
+        dims[1] = this.matrix[0].length;
+
+        return dims;
+    }
+
+    /**
+     * Method to add another matrix to the current matrix.
+     * @param m2 The Matrix to be added to the current matrix.
+     */
+    public void add_matrix(Matrix m2)
+    {
+        // Checking whether the dimensions allow matrix addition.
+        if (Arrays.equals(this.get_dimensions(), m2.get_dimensions())) // Arrays.equals() checks the equality of arrays
+        {
+            for (int i = 0; i < this.matrix.length; i++)
+            {
+                for (int j = 0; j < this.matrix[i].length; j++)
+                {
+                    this.matrix[i][j] += m2.matrix[i][j];
+                }
+            }
+            this.print();
+        }
+        else
+        {
+            System.out.println("Matrix dimensions do not match.");
+        }
+    }
+
+    /**
+     * Method to initialize values for the matrix.
+     *
+     * Not required for the assignment, but will be used to test the program.
+     */
+    public void init_matrix()
+    {
+        for (int i = 0; i < this.matrix.length; i++)
+        {
+            for (int j = 0; j < this.matrix[i].length; j++)
+            {
+                System.out.println("Enter value for (" + i + ", " + j + "): ");
+                this.matrix[i][j] = scanner.nextInt();
+            }
+        }
+    }
+}

Session4/StringEnumPasswordApp/src/lk/ac/pdn/AccessLevel.java → Session4/AccessLevel.java

@@ -1,5 +1,3 @@
-package lk.ac.pdn;
-
 public enum AccessLevel{
   FULL_ACCESS("***"),
   LIMITED_ACCESS("**"),

Session4/Main.java

@@ -0,0 +1,28 @@
+public class Main{
+
+   public void validateRegNo(String regNo) {
+   	if(regNo.length()==8 && (regNo.charAt(0)=='S' || regNo.charAt(0)=='s') && (regNo.charAt(1)=='/') && (regNo.charAt(4)=='/') && Character.isDigit(regNo.charAt(2)) && Character.isDigit(regNo.charAt(3)) && Character.isDigit(regNo.charAt(5)) && Character.isDigit(regNo.charAt(6)) && Character.isDigit(regNo.charAt(7))){
+   		System.out.println("Valid RegNo");
+   	}
+   	else {
+   		System.out.println("Invalid RegNo");
+   	}
+   }
+
+    public static void main(String[] args)
+    {
+
+        final String accessLevel= AccessLevel.FULL_ACCESS.symbol;
+        AccessLevel.checkAccess(accessLevel);
+        //AccessLevel.checkAccess(s);
+        Personnel p1 = new Personnel();
+
+        if (p1.validateLogin())
+            System.out.println("Success");
+        else
+            System.out.println("Failed");
+
+
+    }
+
+}

Session4/StringEnumPasswordApp/src/lk/ac/pdn/Personnel.java → Session4/Personnel.java

@@ -1,5 +1,3 @@
-package lk.ac.pdn;
-
 import java.security.SecureRandom;
 import java.util.Arrays;
 import java.util.Scanner;