Java，将字符串转换为整数，然后将所有整数加在一起
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Java, converting string to integers then add all the integers together
提问by Matt
I need to add 8 numbers together from a string.E.g. If someone enters say 1234 it will add the numbers together 1 + 2 + 3 + 4 = 10 then 1 + 1 = 2. I have done this so far. I cannot figure out how to add these numbers up using a for loop.
我需要从一个字符串中将 8 个数字相加。例如，如果有人输入说 1234，它将把这些数字相加 1 + 2 + 3 + 4 = 10 然后 1 + 1 = 2。到目前为止我已经这样做了。我无法弄清楚如何使用 for 循环将这些数字相加。
String num2;
String num3;
num2 = (jTextField1.getText());
num3 = num2.replaceAll("[/:.,-0]", "");
String[] result = num3.split("");
int inte = Integer.parseInt(num3);
for (int i = 0; i < 8; i++){
// Stuck
}
回答by MByD
How about that (I skipped exceptions...):
怎么样（我跳过了例外......）：
String[] sNums = jTextField1.getText().replaceAll("[^1-9]", "").split("(?<!^)");
int sum = 0;
for (String s : sNums) {
sum += Integer.parseInt(s); // add all digits
}
while (sum > 9) { // add all digits of the number, until left with one-digit number
int temp = 0;
while (sum > 0) {
temp += sum % 10;
sum = sum / 10;
}
sum = temp;
}
回答by helpermethod
For every element in result, you need to convert it to an int, then add it to some variable, maybe called sum.
对于结果中的每个元素，您需要将其转换为 int，然后将其添加到某个变量中，可能称为 sum。
int sum = 0;
// for every String in the result array
for (int i = 0; i < BOUND; i++) {
// convert s[i] to int value
// add the int value to sum
}
回答by Ingo
This pseudo code should do it without splitting, arrays etc.
这个伪代码应该在没有拆分、数组等的情况下完成。
String s = "1234.56";
int sum = 0;
int i = 0;
while (i < s.length()) {
char c = s.charAt(i)
if (c >= '0' && c <= '9') sum += c - '0';
i++;
}
Should result in sum = 21
应该导致总和 = 21
回答by Dorus
public static int addAll(String str) {
str = str.replaceAll("[^1-9]", "");
if (str.length() == 0)
return 0;
char[] c = str.toCharArray();
Integer result = c[0] - 48;
while (c.length > 1) {
result = 0;
for (int i = 0; i < c.length; i++) {
result += c[i] - 48;
}
c = result.toString().toCharArray();
}
return result;
}
