字符串大整数计算
你可以使用Java中的BigInteger类来处理以字符串形式表示的大整数，并计算它们的差值。下面是一个示例函数的Java实现：
import java.math.BigInteger;
public class DifferenceCalculator {
public static String calculateDifference(String num1, String num2) {
BigInteger bigInt1 = new BigInteger(num1);
BigInteger bigInt2 = new BigInteger(num2);
BigInteger difference = bigInt1.subtract(bigInt2);
return difference.toString();
}
public static void main(String[] args) {
String num1 = "12345678901234567890";
String num2 = "-98765432109876543210";
String difference = calculateDifference(num1, num2);
System.out.println("The difference is: " + difference);
}
}
