Java da cok tuhaf bir durum. (senkronizasyonla ilgili)

join(long millis)

package work6;


class Melgra extends Thread {
    
    @Override
    public void run() {
        try {
            System.out.println("Melgra type thread has started.");
            sleep(10000);
            System.out.println("Melgra type thread has ended.");
        } catch(Exception e) {}
    }
    
    public synchronized void moka() {
        
        try {
            sleep(3000);
        } catch (Exception e) {}
        
    }
    
}


class Sona extends Thread {
    
    String name;
    int testNo;
    Melgra thread;
    
    Sona(Melgra thr, String nm, int no) {
        thread = thr;
        name = nm;
        testNo = no;
    }

    public void test1() {
        try {
            System.out.println("Sona " + name + " Thread has started.");
            thread.join(3000);
            System.out.println("Sona " + name + " Thread has ended.");
        } catch (Exception e) {}
    }
    
    public void test2() {
        try {
            System.out.println("Sona " + name + " Thread has started.");
            thread.moka();
            System.out.println("Sona " + name + " Thread has ended.");
        } catch (Exception e) {}
    }


    @Override
    public void run() {

       if (testNo == 1) {test1();}
       else if (testNo == 2) {test2();}
    }
    
}



public class Main {
    
    public static void main(String[] args) {
//      test1();
//      test2();
    }

    public static void test1() {

        Melgra mg1 = new Melgra();
        
        Sona sn1 = new Sona(mg1, "sn1", 1);
        Sona sn2 = new Sona(mg1, "sn2", 1);
        
        mg1.start();
        sn1.start();
        sn2.start();
    }
    

    public static void test2() {

        Melgra mg1 = new Melgra();
        
        Sona sn1 = new Sona(mg1, "sn1", 2);
        Sona sn2 = new Sona(mg1, "sn2", 2);
        
        sn1.start();
        sn2.start();
    }

}