在java中使用charAt添加字符给我错误的总和

Question

int x=(int)compressedText.charAt(one1+1);
int y=(int)compressedText.charAt(one1+2);
count=x+y;
count1=(char)count;

the craracter value for compressedText.charAt(one1+2) and compressedText.charAt(one1+1) are each equal to 1 but when I try to debug my code it says count is equal to 98.

Answer 1

Casting a char that represents a numeric character to an int doesn't do what you think it does. It takes the Unicode value of the char (which is 49 for '1' ). That explains why you get 98 instead of 2 .

Because the code values for the characters '0' through '9' are 48 through 57 , you can subtract '0' ( 48 ) from each char instead, eg

int x = compressedText.charAt(one1+1) - '0';

You'll need to undo this conversion if you are converting an int back to a char that is meant to represent the numeric character. Also you'll need to account for multiple characters if count is more than one digit (>= 10).