package one;

import java.util.Currency;
import java.util.Random;

public class SomeClass implements Runnable {
    private String letter;
    int time = 0;
    Random R = new Random();
    private boolean FlagFirst;
    private boolean FlagTwo;
    int on = 1;

    SomeClass(String letter){
        this.letter = letter;
        while(time<500) time = R.nextInt(1001);
        FlagFirst = true;
        FlagTwo = true;
    }

    public void stopNew(){
        System.out.println("Watek "+letter+" spoczywa");
        FlagFirst = false;
    }

    public void resumeNew(){
        System.out.println("Watek "+letter+" zyje");
        FlagFirst = true;
    }

    public boolean getFlag(){
        return FlagFirst;
    }

    public void end(){
        FlagTwo = false;
    }

    @Override
    public void run() {
        int t = 0;
        while(FlagTwo){
            while (FlagFirst){

                try {
                    System.out.println(letter+t++);
                    Thread.sleep(time);
                } catch (Exception E){
                    System.out.println(E);
                }

            }
        }



    }

}

package one;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.Timer;




public class Main extends Thread  {

    static int time = 0;
    static boolean flag = true;
    static Timer clock = new Timer(1000, new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent e) {
            time++;
            System.out.println(time+" : czasss");
            if (time==60){
                flag = false;
                clock.stop();
            }
        }
    });

    public static void main(String[] args) {

        SomeClass a = new SomeClass("a");
        SomeClass b = new SomeClass("b");
        SomeClass c = new SomeClass("c");
        SomeClass d = new SomeClass("d");


        Thread A = new Thread(a);
        Thread B = new Thread(b);
        Thread C = new Thread(c);
        Thread D = new Thread(d);

        char letter = 'a';

        SomeClass tab_sc []= new SomeClass[7];

        for(int i=0; i<tab_sc.length; i++){
            tab_sc[i] = new SomeClass(String.valueOf(letter++));
        }

        Thread tab[] = new Thread[tab_sc.length];

        for (int i=0; i<tab.length; i++){
            tab[i] = new Thread(tab_sc[i]);
        }
        clock.start();

        for (int n = 0; n<tab.length; n++) tab[n].start();

        while(flag){
            try{
                for(int i=0; i<=tab_sc.length; i++){
                    if(i==0){
                        tab_sc[i].stopNew();
                    } else {
                        if (i<tab_sc.length) tab_sc[i].stopNew();
                        tab_sc[i-1].resumeNew();

                    }
                    if(!flag) break;
                    sleep(3000);
                }
            } catch(Exception e){
                System.out.println(e);
            }
        }

            for (int i=0; i<tab_sc.length; i++){
                if (tab_sc[i].getFlag()) tab_sc[i].stopNew();
                tab_sc[i].end();
            }

        D.isAlive();

    }


}