I am trying to iterate through a string and save the characters in a character array. It iterates perfectly and prints the characters but when I try to save the characters in the Array or in a List, it gives me NullPointerException. Can anyone point out the mistake I am doing here?
try {
List<String> result = Files.readAllLines(Paths.get("C:\\Users\\Rehan\\Documents\\NetBeansProjects\\Marks\\build\\classes\\marks\\input.txt"));
List<Character> marksC = null;
for(String line : result ){
System.out.println(line);
//Reversing each line of string
StringBuilder sb = new StringBuilder(line);
sb.reverse();
String RS = sb.toString();
System.out.println(RS);
//To read first sequence of integers in reversed string
StringCharacterIterator si = new StringCharacterIterator(RS, 0);
for(int i = 0; i <= RS.length() ; i++){
while (si.current()!=' '){
char c = si.current();
marksC.add(c); //This line giving NullPointerException
System.out.println(c);
si.next();
}
break;
}
}
JOptionPane.showMessageDialog(null, result);
}
