1~100, 스레드 당 인쇄 홀수, 스레드 당 짝수

동생이 여름에 어떤 게임회사에 면접을 봤는데 면접관이 이런 질문을 했어요.
1부터 100까지, 한 라인은 홀수, 한 라인은 짝수, 순서대로 출력됩니다.
자신이 지금 코드를 써서 여러분을 공유합니다.

public class A {
	private int i;

	public A() {
		// TODO Auto-generated constructor stub
		i = 1;
	}

	synchronized public void printji() {
		if (i % 2 == 1) {
			System.out.println("Thread id:"+Thread.currentThread().getId()+"--->"+i);
			i++;
		}
	}

	synchronized public void printou() {
		if (i % 2 == 0) {
			System.out.println("Thread id:"+Thread.currentThread().getId()+"--->"+i);
			i++;
		}
	}

	public int geti() {
		return i;
	}
}

public class Thread1 extends Thread {
	private A a;

	public Thread1(A a) {
		// TODO Auto-generated constructor stub
		this.a = a;
	}

	@Override
	public void run() {
		// TODO Auto-generated method stub
		super.run();
		while (a.geti() < 100)
			a.printji();
	}
}

public class Thread2 extends Thread {
	private A a;

	public Thread2(A a) {
		// TODO Auto-generated constructor stub
		this.a = a;
	}

	@Override
	public void run() {
		// TODO Auto-generated method stub
		super.run();
		while (a.geti() < 100)
			a.printou();
	}
}

public class Main {
	public static void main(String[] args) {
		A a=new A();
		Thread1 thread1=new Thread1(a);
		Thread2 thread2=new Thread2(a);
		thread1.start();
		thread2.start();
	}

}

//잘못이 있으면 지적해 주시기 바랍니다.
인쇄 결과:
Thread id:9--->1 Thread id:10--->2 Thread id:9--->3 Thread id:10--->4 Thread id:9--->5 Thread id:10--->6 Thread id:9--->7 Thread id:10--->8 Thread id:9--->9 Thread id:10--->10 Thread id:9--->11 Thread id:10--->12 Thread id:9--->13 Thread id:10--->14 Thread id:9--->15 Thread id:10--->16 Thread id:9--->17 Thread id:10--->18 Thread id:9--->19 Thread id:10--->20 Thread id:9--->21 Thread id:10--->22 Thread id:9--->23 Thread id:10--->24 Thread id:9--->25 Thread id:10--->26 Thread id:9--->27 Thread id:10--->28 Thread id:9--->29 Thread id:10--->30 Thread id:9--->31 Thread id:10--->32 Thread id:9--->33 Thread id:10--->34 Thread id:9--->35 Thread id:10--->36 Thread id:9--->37 Thread id:10--->38 Thread id:9--->39 Thread id:10--->40 Thread id:9--->41 Thread id:10--->42 Thread id:9--->43 Thread id:10--->44 Thread id:9--->45 Thread id:10--->46 Thread id:9--->47 Thread id:10--->48 Thread id:9--->49 Thread id:10--->50 Thread id:9--->51 Thread id:10--->52 Thread id:9--->53 Thread id:10--->54 Thread id:9--->55 Thread id:10--->56 Thread id:9--->57 Thread id:10--->58 Thread id:9--->59 Thread id:10--->60 Thread id:9--->61 Thread id:10--->62 Thread id:9--->63 Thread id:10--->64 Thread id:9--->65 Thread id:10--->66 Thread id:9--->67 Thread id:10--->68 Thread id:9--->69 Thread id:10--->70 Thread id:9--->71 Thread id:10--->72 Thread id:9--->73 Thread id:10--->74 Thread id:9--->75 Thread id:10--->76 Thread id:9--->77 Thread id:10--->78 Thread id:9--->79 Thread id:10--->80 Thread id:9--->81 Thread id:10--->82 Thread id:9--->83 Thread id:10--->84 Thread id:9--->85 Thread id:10--->86 Thread id:9--->87 Thread id:10--->88 Thread id:9--->89 Thread id:10--->90 Thread id:9--->91 Thread id:10--->92 Thread id:9--->93 Thread id:10--->94 Thread id:9--->95 Thread id:10--->96 Thread id:9--->97 Thread id:10--->98 Thread id:9--->99 Thread id:10--->100