是否是2的N次幂

EvenPower.java

public class Is2Power {
	public static void main(String[] args) {
		for (int i = 0;i <= 1024; i++) {
			if ((i & -i) == i)
				System.out.println(Integer.toBinaryString(i) + ", " + Integer.toBinaryString(-i) + " " + i);
		}
	}

}