Многопоточность java

import java.io.PrintStream;
import java.util.concurrent.BrokenBarrierException;
import java.util.concurrent.CyclicBarrier;
import java.util.concurrent.Executors;
 
public class Main {
    public static void main(String[] args) {
        int n = 3;
        var barrier = new CyclicBarrier(n);
        var tp = Executors.newFixedThreadPool(n);
        try {
            for (int i = 0; i < n; ++i) tp.execute(new Printer(barrier, System.out, true));
        } finally {
            tp.shutdown();
        }
    }
}
 
 
class Printer implements Runnable {
 
    private final CyclicBarrier barrier;
    private final PrintStream out;
    private final boolean isPrintNameThread;
 
    Printer(CyclicBarrier barrier, PrintStream out, boolean isPrintNameThread) {
        this.barrier = barrier;
        this.out = out;
        this.isPrintNameThread = isPrintNameThread;
    }
 
    @Override
    public void run() {
        for (int i = 1; i <= 3; ++i) {
            try {
                barrier.await();
                out.println(i + (isPrintNameThread ? " " + Thread.currentThread().getName() : ""));
                barrier.await();
            } catch (InterruptedException e) {
                Thread.currentThread().interrupt();
            } catch (BrokenBarrierException ignored) {
 
            }
        }
    }
}

class Printer implements Runnable {
 
    private final PrintStream out;
    private final boolean isPrintNameThread;
 
    Printer(PrintStream out, boolean isPrintNameThread) {
        this.out = out;
        this.isPrintNameThread = isPrintNameThread;
    }
 
    @Override
    public void run() {
        for (int i = 1; i <= 3; ++i) {
            try {
                Thread.sleep(0, 1);
                out.println(i + (isPrintNameThread ? " " + Thread.currentThread().getName() : ""));
            } catch (InterruptedException e) {
                Thread.currentThread().interrupt();
            }
        }
    }
}