マルチスレッド順印刷ABC

public class ThreadOfWait extends Thread {
    private int count = 0;
    @Override
    public void run() {
        String name = Thread.currentThread().getName();
        while (count <30){
            synchronized (this){
                if(count %3==0){
                    printAndIncrease("A");
                }
                if(count %3==1){
                    printAndIncrease("B");
                }
                if(count %3==2){
                    printAndIncrease("C");
                }
            }
        }
    }
    public void printAndIncrease(String a){
        String name = Thread.currentThread().getName();
        if(a.equals(name)){
            System.out.println(name);
            count ++;
            this.notifyAll();
        }else{
            try {
                this.wait();
            }catch (Exception e){
            }
        }
    }
}

public class TestThread {

    public static void main(String[] arags){
        ThreadOfWait wait = ThreadOfWait();
        Thread a1 = Thread(wait,"A");
        Thread a2 = Thread(wait,"B");
        Thread a3 = Thread(wait,"C");
            a1.start();
            a2.start();
            a3.start();
    }
}