java需要帮助解析字符串中的数字，并将它们放入整数数组中

Question

public class HugeInteger {
    private final int SIZE = 40;
    private int[] bigArray = new int[SIZE];

    public void parse (String str) {
        String[] s = str.split("\\D+");
        for (int i = 0; i < s.length; i++) {
            bigArray[i] = Integer.parseInt(s[i]);
        }
    }

    public void printArray() {
        for (int i = 0; i < SIZE; i++) {
            System.out.print(bigArray[i]);
        }
    }
}

public class IntegerTest {

    public static void main(String[] args) {
        String userStr = "";
        Scanner input = new Scanner(System.in);

        System.out.print("Enter first HugeInteger: ");
        userStr = input.nextLine();

        HugeInteger big = new HugeInteger();
        big.parse(userStr);
        big.printArray();
    }
}

基本上，如果我输入一个长度超过10位的字符串，它会抛出异常，并说：

Exception in thread "main" java.lang.NumberFormatException: For input string: "12345367899" at java.lang.NumberFormatException.forInputString(Unknown Source) at java.lang.Integer.parseInt(Unknown Source) at java.lang.Integer.parseInt(Unknown Source) at HugeInteger.parse(HugeInteger.java:9) at IntegerTest.main(IntegerTest.java:13)

不知道这意味着什么，也不知道如何修复。谢谢

Answer 1

正如您所知，int数据类型是一个32-bit有符号二的补码整数，并且

int range is -2^31 to 2^31 - 1 i.e. -2147483648 to 2147483647

我想你可以用long作为64-bit符号二的补码整数

Answer 2

如果输入的数字超出了int的范围，则应使用long

代码示例如下：

class HugeInteger {
    private final int SIZE = 40;
    private long[] bigArray = new long[SIZE];

    public void parse (String str) {
        String[] s = str.split("\\D+");
        for (int i = 0; i < s.length; i++) {
            String x = s[i];
            bigArray[i] = Long.parseLong(x);
        }
    }

    public void printArray() {
        for (int i = 0; i < SIZE; i++) {
            System.out.print(bigArray[i]);
        }
    }
}

public class IntegerTest {

    public static void main(String[] args) {
        String userStr = "";
        Scanner input = new Scanner(System.in);

        System.out.print("Enter first HugeInteger: ");
        userStr = input.nextLine();

        HugeInteger big = new HugeInteger();
        big.parse(userStr);
        big.printArray();
    }
}