Java parse int value from a char

Question

I just want to know if there s a better solution to parse a number from a character in a string  assuming that we know that the character at index n is a number    String element    el5   String s  s      element charAt 2   int x   Integer parseInt s      result  x   5    useless to say that it s just an example

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That s probably the best from the performance point of view  but it s rough   String element    el5   String s  int x   element charAt 2 - 0     It works if you assume your character is a digit  and only in languages always using Unicode  like Java

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Using binary AND with 0b1111      String element    el5    char c   element charAt 2    System out println c  amp  0b1111        gt   5   amp  0b1111   gt  0b0011 0101  amp  0b0000 1111   gt  5      0   amp  0b1111   gt  0b0011 0000  amp  0b0000 1111   gt  0     1   amp  0b1111   gt  0b0011 0001  amp  0b0000 1111   gt  1     2   amp  0b1111   gt  0b0011 0010  amp  0b0000 1111   gt  2     3   amp  0b1111   gt  0b0011 0011  amp  0b0000 1111   gt  3     4   amp  0b1111   gt  0b0011 0100  amp  0b0000 1111   gt  4     5   amp  0b1111   gt  0b0011 0101  amp  0b0000 1111   gt  5     6   amp  0b1111   gt  0b0011 0110  amp  0b0000 1111   gt  6     7   amp  0b1111   gt  0b0011 0111  amp  0b0000 1111   gt  7     8   amp  0b1111   gt  0b0011 1000  amp  0b0000 1111   gt  8     9   amp  0b1111   gt  0b0011 1001  amp  0b0000 1111   gt  9

User · Answer

String element    el5   int x   element charAt 2  - 48    Subtracting ascii value of  0    48 from char

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Try Character getNumericValue char    String element    el5   int x   Character getNumericValue element charAt 2    System out println  x     x     produces   x 5   The nice thing about getNumericValue char  is that it also works with strings like  el   and  el   where   and   are the digits 5 in Eastern Arabic and Hindi Sanskrit respectively

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By simply subtracting by char  0  zero  a char  of digit  0  to  9   can be converted into int 0 to 9   e g    5 - 0  gives int 5   String str    123    int a str charAt 1 - 0

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String a    jklmn489pjro635ops    int sum   0   String num        boolean notFirst   false   for  char c   a toCharArray           if  Character isDigit c             sum   sum   Character getNumericValue c           System out print  notFirst                c           notFirst   true           System out println         sum

User · Answer

Try the following    str1  2345   int x str1 charAt 2 - 0     here x 4    if u subtract by char  0   the ASCII value needs not to be known

[java] Java: parse int value from a char

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