Merge pull request #1 from TharinduDilshan/Tharindu

Added Abstraction and Encapsulation

Java/OOP/Abstraction/Person.java

@@ -0,0 +1,44 @@
+package Inheritance;
+
+public abstract class Person {
+    private String firstName;
+    private String lastName;
+    private String address;
+
+    public Person() {
+        super();
+    }
+
+    public Person(String firstName, String lastName, String address) {
+        this.firstName = firstName;
+        this.lastName = lastName;
+        this.address = address;
+    }
+
+    public String getFirstName() {
+        return firstName;
+    }
+
+    public void setFirstName(String firstName) {
+        this.firstName = firstName;
+    }
+
+    public String getLastName() {
+        return lastName;
+    }
+
+    public void setLastName(String lastName) {
+        this.lastName = lastName;
+    }
+
+    public String getAddress() {
+        return address;
+    }
+
+    public void setAddress(String address) {
+        this.address = address;
+    }
+
+    public abstract String print();
+
+}

Java/OOP/Abstraction/Student.java

@@ -0,0 +1,38 @@
+package Inheritance;
+
+public class Student extends Person {
+    private String ownerName;
+    private boolean isAtHostel;
+
+    public Student(String ownerName, boolean isAtHostel) {
+        this.ownerName = ownerName;
+        this.isAtHostel = isAtHostel;
+    }
+
+    public Student(String firstName, String lastName, String address, String ownerName, boolean isAtHostel) {
+        super(firstName, lastName, address);
+        this.ownerName = ownerName;
+        this.isAtHostel = isAtHostel;
+    }
+
+    public String getOwnerName() {
+        return ownerName;
+    }
+
+    public void setOwnerName(String ownerName) {
+        this.ownerName = ownerName;
+    }
+
+    public boolean isAtHostel() {
+        return isAtHostel;
+    }
+
+    public void setAtHostel(boolean atHostel) {
+        isAtHostel = atHostel;
+    }
+
+    @Override
+    public String print() {
+        return "Dear Teacher, my father is "+ ownerName+".";
+    }
+}

Java/OOP/Abstraction/Teacher.java

@@ -0,0 +1,27 @@
+package Inheritance;
+
+public class Teacher extends Person {
+    private String subject;
+
+    public Teacher(String subject) {
+        this.subject = subject;
+    }
+
+    public Teacher(String firstName, String lastName, String address, String subject) {
+        super(firstName, lastName, address);
+        this.subject = subject;
+    }
+
+    public String getSubject() {
+        return subject;
+    }
+
+    public void setSubject(String subject) {
+        this.subject = subject;
+    }
+
+    @Override
+    public String print() {
+        return "Dear Students, I am your "+ subject+ " teacher.";
+    }
+}

Java/OOP/Abstraction/Test.java

@@ -0,0 +1,16 @@
+package Inheritance;
+
+public class Test {
+    public void main(String[] args){
+        Person teacher1 = new Teacher("John", "Tarbet", "Sri Lanka", "Science");
+        Person teacher2 = new Teacher("Ann", "Tarbet", "Australia", "Maths");
+
+        Person student1 = new Student("Nimal", "Jackson", "Sri Lanka", "Mason", true);
+        Person student2 = new Student("Kamal", "Jackson", "Australia", "Avery", false);
+
+        System.out.println(teacher1.print());
+        System.out.println(teacher2.print());
+        System.out.println(student1.print());
+        System.out.println(student2.print());
+    }
+}

Java/OOP/Encapsulation/Student.java

@@ -0,0 +1,23 @@
+package Encapsulation;
+
+public class Student{
+    //private data member
+    private String name;
+
+    public Student() {
+        super();
+    }
+
+    public Student(String name) {
+        this.name = name;
+    }
+
+    //getter method for name
+    public String getName(){
+        return name;
+    }
+    //setter method for name
+    public void setName(String name){
+        this.name=name;
+    }
+}

Java/OOP/Encapsulation/Test.java

@@ -0,0 +1,12 @@
+package Encapsulation;
+
+public class Test{
+    public static void main(String[] args){
+        //creating instance of the encapsulated class
+        Student s=new Student();
+        //setting value in the name member
+        s.setName("Tharindu");
+        //getting value of the name member
+        System.out.println(s.getName());
+    }
+}