判断一个正整数是否是2的乘方

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/**
 * 判断一个正整数是否是2的乘方
 */
public class TowPower {
	
	public static boolean isPowerOf2(Integer number) {
		return (number & number-1) == 0;
	}

	public static void main(String[] args) {
		boolean powerOf2 = isPowerOf2(17);
		System.out.println(powerOf2);
		boolean powerOf21 = isPowerOf2(16);
		System.out.println(powerOf21);
	}
}