Pet & MyMath by @AlexU238

Cat.java

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+public class Cat extends Pet {
+    @Override
+    void voice() {
+        System.out.println("Я кіт- Мяууу-Мяууу");
+    }
+}

Cow.java

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+public class Cow extends Pet {
+    @Override
+    void voice() {
+        System.out.println("Я корова- Мууу-Мууу");
+    }
+}

Dog.java

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+public class Dog extends Pet{
+    @Override
+    void voice() {
+        System.out.println("Я пес- Гаууу-Гаууу");
+    }
+}

Main.java

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+public class Main {
+    public static void main(String[] args) {
+        Pet cow = new Cow();
+        Pet cat = new Cat();
+        Pet dog = new Dog();
+        cow.voice();
+        cat.voice();
+        dog.voice();
+
+        System.out.println(MyMath.subtract(MyMath.Pi,MyMath.G));
+        System.out.println(MyMath.sum(MyMath.Pi,MyMath.G));
+        System.out.println(MyMath.multyply(MyMath.G));
+        System.out.println(MyMath.divide(MyMath.G));
+    }
+}

MyMath.java

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+public class MyMath {
+    public static final double Pi=3.14;
+    public static final double G=9.8;
+    public static final int TWO=2;
+
+    public static double subtract(double a, double b){
+        return a-b;
+    }
+
+    public static double sum(double a, double b){
+        return a+b;
+    }
+
+    public static double multyply(double a){
+        return a*TWO;
+    }
+
+    public static double divide(double a){
+        return a/TWO;
+    }
+}

Pet.java

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+abstract class Pet {
+
+    abstract void voice();
+
+}