滑动窗口的最大值

import java.util.ArrayList;
public class WindowMove {
	public ArrayList<Integer> maxInWindows(int[] num, int size) {
		ArrayList<Integer> list = new ArrayList<Integer>();
		if (num == null || size < 0)
			return null;
		if (size == 0) {
			return list;
		}
		int pLow = 0;
		int pHigh = pLow + size - 1;
		while (pHigh < num.length) {
			int max = 0;
			for (int i = pLow; i <= pHigh; i++) {
				if (max < num[i])
					max = num[i];
			}
			list.add(max);
			pLow++;
			pHigh++;
		}
		return list;
	}
}