Dungeons and dragons game. Separate classes for the different areas of the game, I pass my Character object to the Farm class from the Town class and try to attack a monster with the Character.attack(Monster) method in the Character class.
I get the runtime error:
java.lang.NullPointerException
at Farm.slimefight(Farm.java:51)
at Farm.enter(Farm.java:25)
at DAndDWorld.main(DAndDWorld.java:101)
Help?
Code:
DAndDWorld Class (main)
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| import java.util.Scanner;
public class DAndDWorld
{
public static void main(String args[]){
int win = 0;
int hp;
int maxhp;
int att;
int def;
int block;
int healability;
Scanner scan = new Scanner(System.in);
Character me = new Character(1, 1, 10, 10, 1, 1);
Farm farm = new Farm(me);
System.out.println("Welcome to ******'s...");
System.out.println(" ____ _ ____ ");
System.out.println(" | _ \\ _ _ _ __ __ _ ___ ___ _ __ ___ __ _ _ __ __| | | _ \\ _ __ __ _ __ _ ___ _ __ ___ ");
System.out.println(" | | | | | | | '_ \\ / _` |/ _ \\/ _ \\| '_ \\/ __| / _` | '_ \\ / _` | | | | | '__/ _` |/ _` |/ _ \\| '_ \\/ __|");
System.out.println(" | |_| | |_| | | | | (_| | __/ (_) | | | \\__ \\ | (_| | | | | (_| | | |_| | | | (_| | (_| | (_) | | | \\__ \\");
System.out.println(" |____/ \\__,_|_| |_|\\__, |\\___|\\___/|_| |_|___/ \\__,_|_| |_|\\__,_| |____/|_| \\__,_|\\__, |\\___/|_| |_|___/");
System.out.println(" |___/ |___/ ");
System.out.println("========================================================================================================================");
System.out.println("========================================================================================================================");
System.out.println("Warning... This game has no point or plot line!");
System.out.println("Have fun!");
me.begin();
System.out.println("You wake up in a small bed in what looks like an inn.");
System.out.println("A lady walks in.");
System.out.println("Lady: Hello, I found you yesterday knocked out on the street and decieded to take you in. What's your name?");
String name = scan.next();
System.out.println("Lady: ..." + name + "... That's a weird name");
System.out.println("Lady: Anyway... I really don't care about this room so you can have it if you want. \n Whenever you sleep there, your health should be replenished. You should check out the town.");
int q = 0;
while(q == 0){
System.out.println("What would you like to do?");
System.out.println("1)Leave");
System.out.println("2)Hang around a bit");
int choice = scan.nextInt();
if(choice == 1){
q++;
System.out.println("You thank the lady for her hospitality and leave the building");
}
if(choice == 2){
System.out.println("You sit for a second");
System.out.println("Lady: Are you going to leave now?");
}
}
System.out.println("You walk outside and see the town.");
while(win==0){
System.out.println("Where would you like to go...");
System.out.println("1)Home");
System.out.println("2)Store");
System.out.println("3)Outside of Village");
System.out.println("4)The Stats Menu");
System.out.println("5)Exit Game");
int townchoice = scan.nextInt();
if(townchoice==5){
System.out.println("Are you sure you want to stop?");
System.out.println("1)Yes");
System.out.println("2)No");
int endgamechoice = scan.nextInt();
if(endgamechoice==1){
System.out.println("Ok then... Bye.");
win++;
}
if(endgamechoice==2){
}
}
if(townchoice==4){
me.displayData();
}
if(townchoice==1){
System.out.println("You enter your room.");
System.out.println("What would you like to do?");
System.out.println("1)Sleep");
System.out.println("2)Exit");
int roomchoice = scan.nextInt();
if(roomchoice==1){
me.hp = me.maxhp;
System.out.println("You have been fully healed!");
}
}
if(townchoice==2){
Shop shop = new Shop();
shop.enter();
}
if(townchoice==3){
System.out.println("You make your way outside the town and see a sign.");
System.out.println("It reads: Farm to the south; Goblin field to the east; Dragon cave to the north.");
System.out.println("Where would you like to go?");
System.out.println("1)To the farm");
System.out.println("1)To the field");
System.out.println("1)To the cave");
int locchoice = scan.nextInt();
if(locchoice==1){
farm.enter();
}
if(locchoice==2){
}
if(locchoice==3){
}
}
}
}
} |
Character Class:
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| import java.lang.Math;
import java.util.Scanner;
public class Character {
String name;
int hp = 10;
int maxhp = 10;
int att = 1;
int def = 1;
int block = 1;
int healability = 1;
int money = 0;
public void begin() {
int clas;
do {
Scanner scan = new Scanner(System.in);
clas = 0;
System.out.println("Before your adventure begins, what type of warrior do you wish to be?");
System.out.println("1)Knight");
System.out.println("2)Ranger");
System.out.println("3)Mage");
try {
clas = scan.nextInt();
} catch (Exception e) {
clas = -1;
System.out.println("Invalid choice, please try again");
}
} while (clas == -1);
if (clas == 1) {
hp += 3;
maxhp += 3;
def += 2;
att++;
System.out.println("You have chosen a path of better defense and hp");
}
if (clas == 2) {
hp += 2;
maxhp += 2;
def += 2;
att += 2;
System.out.println("You have chosen a path of balanced attributes");
}
if (clas == 3) {
def++;
att += 5;
System.out.println("You have chosen a path of better attack");
}
}
void printMenu() {
System.out.println("0)Display Stats");
System.out.println("1)Attack");
System.out.println("2)Heal");
System.out.println("3)Defend");
System.out.println("4)Runway");
}
Character(int money) {
this.money = money;
}
Character() {
}
Character(int att, int def, int hp, int maxhp, int block, int healability) {
this.att = att;
this.def = def;
this.hp = hp;
this.block = block;
this.healability = healability;
}
public void displayData() {
System.out.println("Attack=" + this.att);
System.out.println("Defense=" + this.def);
System.out.println("HP=" + this.hp + "/" + this.maxhp);
System.out.println("Heal Ability=" + this.healability);
}
public void attack(Character me, Monster m1) {
int damage = (int) (Math.random() * me.att);
int totalDamage = damage - m1.def;
m1.hp = m1.hp - totalDamage;
}
int heal() {
System.out.println("You healed yourself for " + healability + " hitpoint(s).");
return this.healability;
}
int defend() {
return block;
}
boolean runaway() {
boolean run = false;
return run;
}
void inchp() {
hp++;
}
void incatt() {
incatt(1);
}
void incatt(int count) {
att += count;
}
void incdef() {
def++;
}
void incblock() {
block++;
}
void inchealability() {
healability++;
}
boolean death() {
boolean dead = false;
if (hp < 0) {
dead = true;
}
return dead;
}
void instantkill(Monster m1) {
int ikill = 1000000;
m1.hp = m1.hp - ikill;
System.out.println("You did " + ikill + " damage");
}
} |
Monster Class:
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| import java.lang.Math;
public class Monster
{
String name;
int hp;
int att;
int def;
Monster(int att,int def,int hp){
this.att = att;
this.def = def;
this.hp = hp;
}
void attack(Character me){
int damage = (int) (Math.random()*this.att);
int totalDamage = damage - this.def;
me.hp = me.hp - totalDamage;
}
void displayhp(){
System.out.println(hp);
}
boolean death(){
boolean dead = false;
if(hp<0){
dead = true;
}
return dead;
}
} |
Farm Class:
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| import java.util.Scanner;
public class Farm
{
Character me;
public Farm(Character me){
me=me;
}
void enter(){
System.out.println("Hello Traveler! I'm glad you showed up my farm is being overrun by vermin, and they are driving me crazy. Could you kill a few for me?");
Scanner scan = new Scanner(System.in);
System.out.println("1)Yes");
System.out.println("2)No");
int yon = scan.nextInt();
if(yon == 1){
System.out.println("Great! What can you kill first?");
System.out.println("Slimes (Easy)");
System.out.println("Rats (Medium)");
System.out.println("Small Rabid Furry Things (Hard)");
int fch = scan.nextInt();
if(fch==1){
slimefight();
}
if(fch==2){
ratfight();
}
if(fch==3){
rabidfight();
}
}
}
public void slimefight(){
Scanner scann = new Scanner(System.in);
Monster slime = new Monster(10,1,1);
System.out.println("A wild slime appeared!");
int cont = 0;
while(cont==0){
System.out.println("What are you going to do?");
System.out.println("1)Attack");
System.out.println("2)Heal");
System.out.println("3)Show stats");
System.out.println("4)Run Away");
int fightcommand = scann.nextInt();
if(fightcommand==1){
me.attack(me, slime);
}
if(fightcommand==2){
me.hp = me.heal() + me.hp;
}
if(fightcommand==3){
me.displayData();
}
if(fightcommand==4){
System.out.println("You run away like a little baby girl. The farmer laughs at you");
System.out.println("You go back to the city.");
cont++;
}
}
}
void ratfight(){
}
void rabidfight(){
}
} |
Shop Class (unrelated to problem):
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| import java.util.Scanner;
public class Shop {
int money = 0;
Character me = new Character(money);
Scanner scan = new Scanner(System.in);
boolean s1b = false;
void enter() {
System.out.println("You enter the the shop");
System.out.println("Shop Keeper: Welcome sir. What kinds of equipment are you looking for today?");
System.out.println("1)Weapons");
System.out.println("2)Armor");
System.out.println("3)Potions");
System.out.println("4)Exit");
int type = scan.nextInt();
if (type == 1) {
weapons();
}
if (type == 2) {
armor();
}
if (type == 3) {
potions();
}
if (type == 4) {
System.out.println("Ok then. Come back soon!");
}
}
void weapons() {
int weaponsstore = 0;
while(weaponsstore == 0){
System.out.println("What weapon would you like to buy?");
System.out.println("1)Wooden sword------Free");
System.out.println("2)Stone Sword-------10");
System.out.println("3)Steel sword-------100");
System.out.println("4)Diamond sword-----500");
System.out.println("5)Darkmatter sword--1000");
System.out.println("6)Invisable sword---10000");
System.out.println("7)Never Mind");
int sword = scan.nextInt();
if(sword == 1) {
if(s1b=false){
if(money >= 0){
me.incatt();
System.out.println("Your attack has increased by 1!");
s1b = true;
money = money - 0;
}
}
if(s1b=true){
System.out.println("You already bought this weapon...");
}
}
if (sword == 2) {
me.incatt(3);
System.out.println("Your attack has increased by 3!");
}
if (sword == 3) {
me.incatt(5);
System.out.println("Your attack has increased by 5!");
}
if (sword == 4) {
me.incatt(9);
System.out.println("Your attack has increased by 9!");
}
if (sword == 5) {
me.incatt(15);
System.out.println("Your attack has increased by 15!");
}
if (sword == 6) {
me.incatt(30);
System.out.println("Your attack has increased by 30!");
}
if (sword == 7) {
weaponsstore ++;
System.out.println("Oh. Ok, anything else I can help you with?");
enter();
}
}
}
void armor() {
}
void potions() {
}
} |
thanks.
