import java.util.Arrays;
import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.HashMap;


class Main {

  static class Dog {
    private String name;

    public Dog(String name){
      this.name = name;
    }

    @Override
    public String toString(){
      return "Dog "+this.name;
    }

    @Override
    public boolean equals(Object other){
      Dog otherDog = (Dog)other;
      return this.name.equals(otherDog.name);
    }
  }

  public static void main(String[] args) {
    int num = 1;
    double dub = 2.1;

    Dog dog1 = new Dog("Jure");
    Dog dog2 = new Dog("Jim");

    Dog dog3 = dog1;

    Dog dog4 = new Dog("Jim");
    Dog dog5; //null

    System.out.println(dog1);
    System.out.println(dog2);
    System.out.println(dog3);

    System.out.println(dog1 == dog3); //true
    System.out.println(dog2 == dog4); //false, address different
    System.out.println(dog2.equals(dog4));

    Object num2 = new Integer(2);
    Number num2a = (Number)num2;
    Integer o2 = (Integer)num2a;

    int[] numbers = new int[10];
    for(int i=0; i<10; i++){
      numbers[i] = i * 10;
    }
    System.out.println(Arrays.toString(numbers));

    Dog[] dogs = new Dog[10];
    for(int i=0; i<10; i++){
      dogs[i] = new Dog(String.valueOf(i));
    }
    System.out.println(Arrays.toString(dogs));

    List<Dog> dogs2 = new LinkedList<Dog>();
    for(int i=0; i<20; i++){
      dogs2.add(new Dog(String.valueOf(i)));
    }

    dogs2.remove(0);
    System.out.println(dogs2);
    System.out.println(dogs2.size());

    Map<String, Dog> dogbook = new HashMap<String, Dog>();
    dogbook.put("jim", dog2);
    dogbook.put("bla", dog1);
    System.out.println(dogbook);

  }
}