sumNumbers.java

/*
Given a string, return the sum of the numbers appearing in the string, ignoring all other characters. A number is a series of 1 or more digit chars in a row. (Note: Character.isDigit(char) tests if a char is one of the chars '0', '1', .. '9'. Integer.parseInt(string) converts a string to an int.)

sumNumbers("abc123xyz") → 123
sumNumbers("aa11b33") → 44
sumNumbers("7 11") → 18
*/
public int sumNumbers(String str) {
  String num = "0";
  int sum = 0;
  str = str + "x";
  for(int i =0; i < str.length(); i++) {
    
    if(Character.isDigit(str.charAt(i)) ) {
      num = num + str.charAt(i);
    }
      
     else if(!Character.isDigit(str.charAt(i))) {
        sum = sum + Integer.parseInt(num);
        num = "0";
    }
  
  }
  return sum;
  
}