Get a number from a string in java

         How to get number from a string which contains number : example

                                  string str="123";

                   then get a number  num=123 from string str

    

     int getNumber(String str){

        int i=0;

        int num=0;

        int zeroAscii = (int)'0';

        while (i<str.length()) {

            int charAscii=(int)str.charAt(i);

            num=num*10+(charAscii-zeroAscii);

             i++;

              }   

        return num;

    }

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