java实现十进制正数或负数转成二进制

public class Count1Number {
	public static String turn(int number) {
		StringBuffer sb = new StringBuffer();
		if (number > 0) {
			while (number != 0) {
				if (number > 0) {
					sb.append(number % 2);
					number = number / 2;
				}
			}
		} else if (number < 0) {
			for (int i = 0; i < 32; i++) {
				// 0x80000000 是一个首位为1，其余位数为0的整数
				int t = (number & 0x80000000 >>> i) >>> (31 - i);
				sb.append(t);
			}
		}
		return sb.toString();
	}

	public static void main(String[] args) {

		String turn = turn(3);
		System.out.println(turn);

	}
}