Java中存储10^12位数字和检查单个数字的有效方法

import java.math.BigInteger;

public class LargeNumber {
    public static void main(String[] args) {
        // 存储10^12位数字
        String numberString = "1234567890123456789012345678901234567890";
        BigInteger number = new BigInteger(numberString);

        // 检查单个数字的有效性
        int digit = 5;
        boolean isValid = checkDigitValidity(number, digit);

        System.out.println("Number: " + number);
        System.out.println("Digit: " + digit);
        System.out.println("Validity: " + isValid);
    }

    private static boolean checkDigitValidity(BigInteger number, int digit) {
        // 将数字转换为字符串
        String numberString = number.toString();

        // 检查字符串中是否包含指定的数字字符
        char digitChar = Character.forDigit(digit, 10);
        return numberString.contains(Character.toString(digitChar));
    }
}