我试图为HearthStone制作随机牌组生成器，而card []数组出现问题。它给了我空指针异常，并且第一次出现在readFile()方法中，调试器说问题在于这一行（好吧它始终在那里开始）card[a].setName(name);。我知道它不是字符串变量＆＃34; name＆＃34;因为我可以在System.out.print()中引用它。
P.S。我的编译器是netbeans IDE 8.0.2
HearthStoneDeckMaker
package hearthstone.deck.maker;
import java.io.*;
import java.lang.*;
import java.util.*;
public class HearthStoneDeckMaker {
static createfile save = new createfile();
public static double manaAVG = 5;
public static int maxTaunt = 30;
public static int maxSpell = 30;
public static int maxMinions = 30;
public static int minTaunt = 0;
public static int minSpell = 0;
public static int minMinions = 0;
static Scanner input = new Scanner(System.in);
public static int numberOfCards = 0;
static Card[] card = new Card[9999];
static int i;
static int usedMinions = 0;
static int usedSpells = 0;
static int usedTaunts = 0;
static String cls = "\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n";
private static Scanner x;
public static void addcards(){
for (i = numberOfCards; i <= numberOfCards; i++) {
boolean DoneWithCard = false;
while(DoneWithCard == false){
card[i] = new Card();
System.out.print("Name of Card >> ");
card[i].setName(input.nextLine());
System.out.print(card[i].getName()+"'s Class >> ");
card[i].setCharacter(input.nextLine());
boolean isValid = false;
String message = "";
String cardtype = "";
while(isValid == false){
System.out.println(message +"Is " + card[i].getName() + " a minion or a spell >>");
if(input.nextLine().equalsIgnoreCase("minion")){
card[i].setIsMinion(true);
isValid = true;
cardtype = "minion";
}
else if(input.nextLine().equalsIgnoreCase("spell")){
card[i].setIsSpell(true);
isValid = true;
cardtype = "spell";
}
else{
message = "<INVALID ENTRY TRY AGAIN> ";
}
}
String hastaunt = "";
System.out.print("Does "+ card[i].getName() + " have Taunt (Y/N) >>");
if(input.nextLine().equalsIgnoreCase("Y")) {
card[i].setHasTaunt(true);
hastaunt = "Does";
}
else{
card[i].setHasTaunt(false);
hastaunt = "Does not";
}
System.out.print("What is " +card[i].getName() +"'s mana cost >>");
card[i].setMana(input.nextInt());
if(card[i].getIsSpell() == false){
System.out.print("What is " +card[i].getName() +"'s health >>");
card[i].setHealth(input.nextInt());
}
else{
card[i].setHealth(0);
}
System.out.print("What is " +card[i].getName() +"'s damage >>");
card[i].setDamage(input.nextInt());
System.out.println("would you like to add a desription (Y/N)");
String ADesc = input.nextLine();
if(input.nextLine().equalsIgnoreCase("y")){
System.out.println("What is "+ card[i].getName() + "'s description >>");
card[i].setDescription(input.nextLine());
}
else{
System.out.println("Alright next");
}
System.out.println(card[i].getName() + " is a(n) " + cardtype + " with " +card[i].getDamage() + ""
+ "/" + card[i].getHealth() + "\nand " + hastaunt + " have taunt");
System.out.print("is this correct? (Y/N)");
if(input.nextLine().equalsIgnoreCase("Y")){
DoneWithCard = true;
}
else{
DoneWithCard = false;
}
}
System.out.print("Do you want to enter another card? (Y/N)");
if(input.nextLine().equalsIgnoreCase("n")){
numberOfCards = i+1;
save.OpenFile();
save.addRecords();
save.closeFile();
numberOfCards++;
parameters();
}
else{
numberOfCards++;
}
}
}
public static void setup(){
int counter = 0;
boolean add = false;
System.out.println("Current Cards >>");
openFile();
}
public static void openFile(){
try{
x = new Scanner(new File("HearthCards.txt"));
}
catch(Exception e){
System.out.println("Load Failure");
}
readFile();
}
public static void readFile(){
Card[] cardie = new Card[numberOfCards];
while(x.hasNext()){
numberOfCards++;
int a = 0;
String name = x.next();
String Character= x.next();
int Health = Integer.parseInt(x.next());
int Damage = Integer.parseInt(x.next());
int Mana = Integer.parseInt(x.next());
int TimesUsed = Integer.parseInt(x.next());
boolean hasTaunt = Boolean.parseBoolean(x.next());
boolean isMinion = Boolean.parseBoolean(x.next());
boolean isSpell = Boolean.parseBoolean(x.next());
card[a].setName(name);
card[a].setCharacter(Character);
card[a].setHealth(Health);
card[a].setDamage(Damage);
card[a].setMana(Mana);
card[a].setTimesUsed(0);
card[a].setHasTaunt(hasTaunt);
card[a].setIsMinion(isMinion);
card[a].setIsSpell(isSpell);
a++;
}
closeFile();
}
public static void closeFile(){
x.close();
setupcont();
}
public static void setupcont(){
for (int j = 0; j <= 30; j++) {
String type = "oof";
String taunts = "oofer";
if(card[j].getIsMinion() == true){
type = "minion";
}
else if(card[j].getIsSpell() == true){
type = "spell";
}
if(card[j].getHasTaunt() == true){
taunts = "has";
}
else{
taunts = "doesnt have";
}
System.out.println(cls);
System.out.println(card[j].getName() + " >> " + card[j].getName() + " is a " + type + " that "+ taunts + " taunt");
}
System.out.print("would you like to add any new Cards (Y/N)");
if(input.nextLine().equalsIgnoreCase("y")){
addcards();
}
else{
makedeck();
}
}
public static void parameters(){
System.out.print("Would you like to use default max and mins, or custom >> ");
if(input.nextLine().equalsIgnoreCase("default")){
makedeck();
}
else{
System.out.print("What should the mana average be?");
manaAVG = input.nextInt();
System.out.println("What is the max taunt minions ?");
maxTaunt = input.nextInt();
System.out.print("What is max minions (1-30) >> ");
maxMinions = input.nextInt();
System.out.print("What is the max spells (1-30) >> ");
maxSpell = input.nextInt();
if(maxMinions + maxSpell < 30){
System.out.println("<INVALID ENTRY TRY AGAIN> What is the max spells (1-30 >> ");
maxSpell = input.nextInt();
}
}
}
public static void makedeck(){
Card deck[] = new Card[30];
for(int a = 0; a <= 30; a++){
Random ran = new Random(i);
int rand = ran.nextInt();
if(card[rand].getTimesUsed() <= 2){
deck[a] = card[rand];
String hastaunt = "does not";
if(card[rand].getHasTaunt() == true){
hastaunt = "does";
usedTaunts++;
}
String cardtype = "";
if(card[rand].getIsMinion() == true && usedMinions < maxMinions){
usedMinions++;
cardtype = "minion";
}
System.out.println(deck[rand].getName() + " is a(n) " + cardtype + " with " +deck[rand].getDamage() + ""
+ "/" + deck[rand].getHealth() + "\nand " + hastaunt + " have taunt");
}
}
boolean isDone = false;
Random ran = new Random(i);
int rand = ran.nextInt();
boolean minMinDone = false;
boolean maxMinDone = false;
boolean minSpellDone = false;
boolean maxSpellDone = false;
boolean minTauntDone = false;
boolean maxTauntDone = false;
boolean correctClass = false;
System.out.println("What Class would you like to use");
String usedClass = input.nextLine();
while(isDone == false){
Random R = new Random(i);
int Ran = R.nextInt();
if(usedMinions < minMinions){
Ran = R.nextInt();
if(deck[Ran].getIsMinion() == false){
int random = R.nextInt();
if(card[random].getTimesUsed() <= 2){
deck[Ran] = card[random];
}
}
}
else{
minMinDone = true;
}
if(usedMinions > maxMinions){
Ran = R.nextInt();
if(deck[Ran].getIsMinion() == true){
int random = R.nextInt();
deck[Ran] = card[random];
if(card[random].getTimesUsed() <= 2){
deck[Ran] = card[random];
}
}
}
else{
maxMinDone = true;
}
if(usedSpells < minSpell){
Ran = R.nextInt();
if(deck[Ran].getIsSpell() == false){
int random = R.nextInt();
if(card[random].getTimesUsed() <= 2){
deck[Ran] = card[random];
}
}
}
else{
minSpellDone = true;
}
if(usedSpells > maxSpell){
Ran = R.nextInt();
if(deck[Ran].getIsMinion() == true){
int random = R.nextInt();
if(card[random].getTimesUsed() <= 2){
deck[Ran] = card[random];
}
}
}
else{
maxSpellDone = true;
}
if(usedTaunts < minTaunt){
Ran = R.nextInt();
if(deck[Ran].getHasTaunt() == false){
int random = R.nextInt();
if(card[random].getTimesUsed() <= 2){
deck[Ran] = card[random];
card[Ran].setTimesUsed(card[Ran].getTimesUsed() + 1);
}
}
}
else{
minTauntDone = true;
}
if(usedTaunts > maxTaunt){
Ran = R.nextInt();
if(deck[Ran].getHasTaunt() == true){
int random = R.nextInt();
if(card[random].getTimesUsed() <= 2){
deck[Ran] = card[random];
}
}
}
else{
maxTauntDone = true;
}
correctClass = false;
for (int j = 0; j <= 30; j++) {
while(!deck[j].getCharacter().equalsIgnoreCase(usedClass)){
int random = R.nextInt();
if(card[random].getTimesUsed() <= 2 && card[random].getCharacter().equalsIgnoreCase(usedClass)){
deck[j] = card[random];
}
}
}
correctClass = true;
if(minMinDone == true && maxMinDone == true && minSpellDone == true && maxSpellDone == true && minTauntDone == true && maxTauntDone == true && correctClass == true){
isDone = true;
}
else{
isDone = false;
}
}
for (int j = 0; j <= 30; j++) {
String type = "oof";
String taunts = "oofer";
if(deck[j].getIsMinion() == true){
type = "minion";
}
else if(deck[j].getIsSpell() == true){
type = "spell";
}
if(deck[j].getHasTaunt() == true){
taunts = "has";
}
else{
taunts = "doesnt have";
}
System.out.println(cls);
if(!deck[j].getDescription().equals("")){
System.out.println(deck[j].getName() + " >> " + deck[j].getName() + " is a " + type + " that "+ taunts + " taunt >>> \n\t" + deck[j].getDescription());
}
else{
System.out.println(deck[j].getName() + " >> " + deck[j].getName() + " is a " + type + " that "+ taunts + " taunt");
}
}
}
public static void main(String[] args) {
setup();
}
}
卡
package hearthstone.deck.maker;
public class Card {
private String Name;
private String Class;
private boolean HasTaunt;
private int Mana;
private int Damage;
private int Health;
private boolean isMinion = false;
private boolean isSpell = false;
private boolean isElemental = false;
private int TimesUsed = 0;
private String Description = " no description ";
//Omitted getters and setters
public Card(){
}
}
CREATEFILE
package hearthstone.deck.maker;
import java.io.*;
import java.lang.*;
import java.util.*;
public class createfile {
int numCards = HearthStoneDeckMaker.numberOfCards;
private Formatter x;
public void OpenFile(){
try{
x = new Formatter("HearthCards.txt");
}
catch(Exception e){
System.out.println("Save Failed");
}
}
public void addRecords(){
for (int j = 0; j < HearthStoneDeckMaker.numberOfCards; j++) {
x.format("%s %s %x %x %x %x %b %b %b %n", HearthStoneDeckMaker.card[j].getName(), HearthStoneDeckMaker.card[j].getCharacter(), HearthStoneDeckMaker.card[j].getHealth(), HearthStoneDeckMaker.card[j].getDamage(), HearthStoneDeckMaker.card[j].getMana(), HearthStoneDeckMaker.card[j].getTimesUsed(), HearthStoneDeckMaker.card[j].getHasTaunt(), HearthStoneDeckMaker.card[j].getIsMinion(), HearthStoneDeckMaker.card[j].getIsSpell());
}
}
public void closeFile(){
x.close();
}
}