Java如何使用while循环计算一个整数的位数

public static void count(int n) {
		
		if(n >= 0 && n <= 999999999) {
			int countN = 0;
			while(n != 0) {
				countN++;
				n /= 10;
			}
			System.out.println("它是个" + countN + "位数！");
		}else {
			System.out.println("The number is too large! ");
		}
	}

System.out.println("任意输入一个整数（小于10位）：");
Scanner sc = new Scanner(System.in);
long s = sc.nextLong();
String str = String.valueOf(s);
if(str.length() >= 10){
System.out.println("您输入的整数超过的10位！");
}else{
System.out.println("您输入的整数是"+str.length()+"位。");
}

System.out.println("任意输入一个整数（小于10位）：");
Scanner sc = new Scanner(System.in);
int num = sc.nextInt();
int count = 0;
//计算位数
do{
num /= 10;
count++;
}while(num > 0);
System.out.println("该数字是"+count+"位。");