求教约瑟夫环java迭代器实现的思路，尤其是两个if的判断是怎么想的

[sinat_28916691]

public static void pass(int m, int n) {
		int i, j, mPrime, numLeft;
		ArrayList<Integer> L = new ArrayList<Integer>();
		for (i = 1; i <= n; i++)
			L.add(i);
		ListIterator<Integer> iter = L.listIterator();
		Integer item = 0;
		numLeft = n;
		mPrime = m % n;
		for (i = 0; i < n; i++) {
			mPrime = m % numLeft;
			if (mPrime <= numLeft / 2) {
				if (iter.hasNext())
					item = iter.next();
				for (j = 0; j < mPrime; j++) {
					if (!iter.hasNext())
						iter = L.listIterator();
					item = iter.next();
				}
			} else {
				for (j = 0; j < numLeft - mPrime; j++) {
					if (!iter.hasPrevious())
						iter = L.listIterator(L.size());
					item = iter.previous();
				}
			}
			System.out.print("Removed " + item + " ");
			iter.remove();
			if (!iter.hasNext())
				iter = L.listIterator();
			System.out.println();
			for (Integer x : L)
				System.out.print(x + " ");
			System.out.println();
			numLeft--;
		}
		System.out.println();
	}

[心随自在飞]

变量名都不知道什么意思，看着头疼！ 注意下规范！