java:在BigInteger的情况下for循环是如何工作的

import java.math.BigInteger;

public class BigIntegerLoopExample {
    public static void main(String[] args) {
        BigInteger number = new BigInteger("12345678901234567890");
        
        // 将BigInteger转换为字符串
        String numberStr = number.toString();
        
        // 遍历字符串的每一位
        for (int i = 0; i < numberStr.length(); i++) {
            char digitChar = numberStr.charAt(i);
            int digit = Character.getNumericValue(digitChar);
            System.out.println("Digit at position " + i + " is: " + digit);
        }
    }
}

String numberStr = number.toString();
for (int i = 0; i < numberStr.length(); i++) {
    char digitChar = numberStr.charAt(i);
    int digit = Character.getNumericValue(digitChar);
    // 处理每一位数字
}