AnimalsTest.java

public class AnimalsTest {
  public static void main(String[] args) {
    Cat cat = new Cat("Tom", 8);
    Mouse mouse = new Mouse("Jerry", 3);

    System.out.println("Cat name is: " + cat.getName());
    System.out.println("Mouse name is: " + mouse.getName());
    System.out.println("Mouse weight is: " + mouse.weight);
  }
}

abstract class Animal {
  private final String name;

  protected Animal(String name) {
    this.name = name;
  }

  public String getName() {
    return name;
  }
}


public class Cat extends Animal {
  public final int age;

  public Cat(String name, int age) {
    super(name);
    this.age = age;
  }
}


public class Mouse extends Animal {
  final int weight;

  public Mouse(String name, int weight) {
    super(name);
    this.weight = weight;
  }
}