Developement

src/main/java/Main/Cat.java

@@ -1,4 +1,29 @@
 package Main;
 
-public class Cat {
+public class Cat extends Mammal implements Carnivore {
+    private String breed;
+
+    public String getBreed() {
+        return breed;
+    }
+    public void setBreed(String breed) {
+        this.breed = breed;
+    }
+    public Cat(String name, String gender , int age , int weight , String breed) {
+        super(name , gender , age , weight);
+        this.breed = breed;
+
+        @Override
+        public void move() {
+            System.out.println(getName()  + " is walking on four legs");
+        }
+        @Override
+        public void makeSound() {
+            System.out.println(getName() + " is making mew sound");
+        }
+        @Override
+        public void eatMeat() {
+            System.out.println(getName() + " is eating meat");
+        }
+    }
 }

src/main/java/Main/Creature.java

@@ -2,4 +2,5 @@
 
 public interface Creature {
     abstract void live();
+    abstract void breathe();
 }

src/main/java/Main/Human.java

@@ -1,32 +1,48 @@
 package Main;
 
 public class Human extends Mammal implements Carnivore, Herbivore {
-    private String name;
-    private int age;
-    public Human(String name, int age) {
-        this.name = name;
-        this.age = age;
+    private int height;
+    private String nationality;
+
+    public int getHeight() {
+        return height;
+    }
+    public void setHeight(int height) {
+        this.height = height;
+    }
+    public String getNationality() {
+        return nationality;
+    }
+    public void setNationality(String nationality) {
+        this.nationality = nationality;
     }
+
+    public Human(String name, String gender , int age , int weight , int height , String nationality) {
+        super(name , gender , age , weight);
+        this.height = height;
+        this.nationality = nationality;
+    }
+
     @Override
     public void move() {
-        System.out.println(this.name + "is walking");
+        System.out.println(getName()  + " is walking");
     }
     @Override
     public void makeSound() {
-        System.out.println(this.name + "is speaking");
+        System.out.println(getName() + " is speaking");
     }
 
     @Override
     public void eatMeat() {
-        System.out.println(this.name + "is eating meat");
+        System.out.println(getName() + " is eating meat");
     }
 
     @Override
     public void eatPlants() {
-        System.out.println(this.name + "is eating plants");
+        System.out.println(getName() + " is eating plants");
     }
 
     public void work() {
-        System.out.println(this.name + "is working");
+        System.out.println(getName() + " is working");
     }
 }

src/main/java/Main/Mammal.java

@@ -1,10 +1,55 @@
 package Main;
 
 public abstract class Mammal implements Creature {
+    private String name;
+    private String gender;
+    private int age;
+    private int weight;
+
+    public int getAge() {
+        return age;
+    }
+    public void setAge(int age) {
+        if (age > 0)
+            this.age = age;
+    }
+
+    public int getWeight() {
+        return weight;
+    }
+    public void setWeight(int weight) {
+        if(weight > 0)
+            this.weight = weight;
+    }
+    public String getName() {
+        return name;
+    }
+    public void setName(String name) {
+        this.name = name;
+    }
+    public String getGender() {
+        return gender;
+    }
+    public void setGender(String gender) {
+        if(gender.equals("male") || gender.equals("female"))
+            this.gender = gender;
+    }
+
+    public Mammal(String name, String gender , int age, int weight) {
+        setName(name);
+        setGender(gender);
+        setAge(age);
+        setWeight(weight);
+    }
+
     public abstract void move();
     public abstract void makeSound();
     @Override
     public void live() {
-        // TODO
+        System.out.println("Mammals are living");
+    }
+    @Override
+    public void breathe() {
+        System.out.println("Mammals breathe to be alive");
     }
 }