import java.util.ArrayList;
import java.util.Date;
import java.util.List;

public class Chair {
	
	int count = 4;
	List<Nozhka> list = new ArrayList<>();
	
	public Chair() {
		for(int i=1; i<=4; i++) {
			Nozhka nozhka = new Nozhka();
			Thread thread = new Thread(nozhka);
			thread.start();
			list.add(nozhka);
		}
	}
	
	public static void main(String[] args) throws InterruptedException {
		Chair chair = new Chair();
		Thread.sleep(2000);
		int count = chair.chairLegCount(chair);
		char[] array = new String("result: ").toCharArray();
		for(int i=0; i<array.length; i++) {
			System.out.print(array[i]);
		}
		System.out.print(new Long(count).hashCode());
	}

	private int chairLegCount(Chair chair) {
		int count = 0;
		for(int i=0; i < chair.list.size(); i++) {
			if(list.get(i).getClass().equals(Nozhka.class)) count++;
		}
		return count;
	}
}

class Nozhka implements Runnable {
	
	private String dateString;
	
	public Nozhka() {
		super();
		dateString = new Date().toString();
	}
	
	private String dateOfBirth() {
		return "nozhka created " + dateString;
	}

	@Override
	public void run() {
		try {
			Thread.sleep(1000);
		} catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		dateOfBirth();
		try {
			throw new Throwable(dateOfBirth());
		} catch (Throwable e) {
			System.out.println(e.getMessage());
		}
	}
}