Polymorphism added and Bug fix

Author: ThusharaX

.vscode/settings.json

@@ -5,6 +5,7 @@
         "Basics/Constructors",
         "Basics/GettersAndSetters",
         "Basics/Inheritance",
+        "Basics/Polymorphism",
         "Exercises/L01",
         "Exercises/L02",
         "Exercises/L03",

Basics/Classes/MyMain.java

@@ -1,5 +1,5 @@
 public class MyMain {
-    public static void main(String[] args) {
+    public static void main(String args[]) {
         Recepitionist recep1= new Recepitionist();
         boolean status = recep1.checkRoomAvailability(3);
         double bill = recep1.generateBill();

Basics/Constructors/MyMain.java Basics/Constructors/ConstructorsMain.java

@@ -1,5 +1,5 @@
-public class MyMain {
-    public static void main(String[] args) {
+public class ConstructorsMain {
+    public static void main(String args[]) {
         Recepitionist recep1= new Recepitionist();
         boolean status = recep1.checkRoomAvailability(3);
         double bill = recep1.generateBill();

Basics/GettersAndSetters/MyMain.java Basics/GettersAndSetters/GettersAndSettersMain.java

@@ -1,5 +1,5 @@
-public class MyMain {
-    public static void main(String[] args) {
+public class GettersAndSettersMain {
+    public static void main(String args[]) {
         Recepitionist recep1 = new Recepitionist();
 
         recep1.setID(12);

Basics/Inheritance/Main.java Basics/Inheritance/InheritanceMain.java

@@ -1,5 +1,5 @@
-public class Main {
-    public static void main(String[] args) {
+public class InheritanceMain {
+    public static void main(String args[]) {
         Rectangle rec1 = new Rectangle("Rec1", 15, 10);
         rec1.printDetails();
     }

Basics/Input.java

@@ -1,7 +1,7 @@
 import java.util.Scanner;   // Import the Scanner class
 
 public class Input {
-    public static void main(String[] args) {
+    public static void main(String args[]) {
         // Variable declaration
         String name;
         int age;

Basics/Polymorphism/PolymorphismMain.java

@@ -0,0 +1,62 @@
+class Animal {
+    // protected:
+    protected String name;;
+    // public:
+    public Animal() {}
+    public Animal(String  tname) {
+	    name = tname;
+    }
+    public void speak() {}
+    public void song() {
+        System.out.println(name + "'s Song ");
+	      speak();
+        System.out.println("la la la la");
+	      speak();
+        System.out.println("la la la la");
+	      speak();
+        System.out.println("=====================");
+    }
+}
+class Cat extends Animal {
+    //  public:
+    public Cat() {}
+    public Cat(String tname) {
+        super(tname);
+    }
+    public void speak() {
+	    System.out.println("Meow... Meow...");
+    }
+}
+class Dog extends Animal {
+    // public:
+    public Dog() {}
+    public Dog(String tname) {
+       super(tname); 
+    }
+    public void speak() {
+        System.out.println("Bow... Bow...");
+    }
+}
+class Cow extends Animal {
+    // public:
+    public Cow() {}
+    public Cow(String tname) {
+        super(tname);
+    }
+    public void speak() {
+	System.out.println("Moo... Moo...");
+    }
+}
+class PolymorphismMain {
+  public static void main(String args[]) {
+  	Animal ani[] = new Animal[4];
+	  ani[0] = new Cat("Micky the Cat");
+	  ani[1] = new Dog("Rover the Dog");
+	  ani[2] = new Cow("roo the Cow");
+	  ani[3] = new Animal("no name");
+
+	  for (int r=0;r<4; r++) {
+	    ani[r].song();
+      }
+    }	
+}

Basics/Printing.java

@@ -1,5 +1,5 @@
 public class Printing {
-    public static void main(String[] args) {
+    public static void main(String args[]) {
         // Print without newline
         System.out.print("Thushara");
 

Exercises/L01/Exercise3.java

@@ -7,7 +7,7 @@
 import java.util.Scanner;
 
 public class Exercise3 {
-    public static void main(String[] args) {
+    public static void main(String args[]) {
         int max = 0, min = 0, num = 0, count = 1;
 
         Scanner myScanner = new Scanner(System.in);

Exercises/L01/Exercise4.java

@@ -7,7 +7,7 @@
 import java.util.Scanner;
 
 public class Exercise4 {
-    public static void main(String[] args) {
+    public static void main(String args[]) {
         int number, evenCount = 0, oddCount = 0, count = 0;
 
         Scanner myScanner = new Scanner(System.in);