logan5234 logan5234 - 10 months ago 44
Java Question

Populating Array from File input

EDIT: Regex "." is different from String ".", using "\\." instead solved the problem. Thanks everyone.

I'm working on a pokemon battle simulator, (basically pokemonshowdown gen1), trying to automate making the pokemon array, but running into a Scanner problem. File is formatted as: Name.Type1.Type2.hp.attack.defense.special.speed.list of learnable moves. So:
Aerodactyl.Flying.Rock.,Bide,Bite,Double-Edge,Double Team,Dragon Rage,Fire Blast,Fly,Hyper Beam,Mimic,Rage,Razor Wind,Reflect,Rest,Sky Attack,Substitute,Supersonic,Swift,Take Down,Toxic,Wing Attack.

I've gotten a method working for both my typeArray and moveArray but for some reason using basically the same loop the scanner is returning empty tokens instead of what's in the file. Here's the whole method, it's throwing the error at the parseInt call for hp. Thanks for any help!

0 Exception in thread "main" java.lang.NumberFormatException: For input string: ""
at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
at java.lang.Integer.parseInt(Integer.java:592)
at java.lang.Integer.parseInt(Integer.java:615)
at Controller.initPokemonArray(Controller.java:169)
at Controller.<init>(Controller.java:29)
at Driver.main(Driver.java:15)

private Pokemon[] initPokemonArray() {
Pokemon[] pokemonArray = new Pokemon[83];
try {
Scanner inputScan = new Scanner(new File("src/pokemon")).useDelimiter(".");
String name = "";
Type type1 = typeArray[0];
String inputType1 = "";
Type type2 = typeArray[0];
String inputType2 = "";
int hp = 0;
int atk = 0;
int def = 0;
int spc = 0;
int spe = 0;
String[] lm = {};
Move[] learnableMoves;
int counter = 0;
while (counter < 83) {
if (inputScan.hasNextLine()) {
name = inputScan.next();
System.out.println(name+" ");
inputType1 = inputScan.next();
for (int i = 0;i < 16;i++)
if (inputType1.equals(typeArray[i].toString()))
type1 = typeArray[i];
System.out.println(type1.toString()+" ");
inputType2 = inputScan.next();
for (int i = 0;i < 16;i++)
if (inputType2.equals(typeArray[i].toString()))
type2 = typeArray[i];
System.out.println(type2.toString()+" ");
hp = Integer.parseInt(inputScan.next());
System.out.println(hp+" ");
atk = Integer.parseInt(inputScan.next());
System.out.println(atk+" ");
def = Integer.parseInt(inputScan.next());
System.out.println(def+" ");
spc = Integer.parseInt(inputScan.next());
System.out.println(spc+" ");
spe = Integer.parseInt(inputScan.next());
System.out.println(spe+" ");
lm = inputScan.next().split(",");
//TODO move this to private helper method
learnableMoves = new Move[lm.length];
for (int i = 0;i < 160;i++) {
for (int j = 0;j < lm.length;j++) {
if (lm[j] == moveArray[i].getName())
learnableMoves[j] = moveArray[i];
pokemonArray[counter] = new Pokemon(name,type1,type2,hp,atk,def,spc,spe,learnableMoves);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
return pokemonArray;

DISCLAIMER: this is a project for my java 2 course and also my first post on here so I don't know exactly what I'm supposed to do so just letting it be known down here.

Joe Joe
Answer Source

The useDelimiter() method takes the passed String as regex value.https://docs.oracle.com/javase/8/docs/api/java/util/Scanner.html#useDelimiter-java.lang.String-. A period has a specific meaning in regex. To get the specific character "." use this.

Scanner inputScan = new Scanner(new File("src/pokemon")).useDelimiter("\\.");