-1
私はこのエラーを取得しておきます：110）ButtonsLab.main（ButtonsLab.java:155でカント修正エラー例外「メイン」java.lang.NullPointerExceptionが
）
はこの質問をしている何人かの人々がありますが、私はこの問題を修正するものを見つけるように見えることはできません。私はpvc1（）メソッドの配列と何か関係があることを知っています。
import java.util.Scanner;
import java.util.ArrayList;
import java.util.Random;
class ButtonsLab
{
ArrayList<Integer> buttons;
ButtonsLab(){
buttons = new ArrayList<Integer>();
}
public void fillMyArray(){
for(int i = 0; i < 5; i++){
buttons.add(i + 1);
}
}
public static int pvp(int buttonNum){
Scanner in = new Scanner(System.in);
int player1 = 0;
int player2 = 0;
int x = 0; //determines who wins
while (buttonNum > 1){
while (player1 < 1 || player1 > 3){
System.out.println("Player 1: How many buttons do you take?(1-3)");
player1 = in.nextInt();
}
buttonNum -= player1;
if(buttonNum != 1){
System.out.println("There are " + buttonNum + " Buttons on the board.");
}
else{
System.out.println("... There is 1 Button on the board.");
}
if(buttonNum == 1){
x = 1;
}
else{
while (player2 < 1 || player2 > 3){
System.out.println("Player 2: How many buttons do you take?(1-3)");
player2 = in.nextInt();
}
}
buttonNum -= player2;
if(buttonNum != 1){
System.out.println("There are " + buttonNum + " Buttons on the board.");
}
else if(x !=1){
System.out.println("... There is 1 Button on the board.");
}
player1 = 0;
player2 = 0;
}
if(x == 1){
while (player2 < 1 || player2 > 3){
System.out.println("Player 2: How many buttons do you take?(1-3)");
player2 = in.nextInt();
}
System.out.println("Player 2, you lose.");
}
else{
while (player1 < 1 || player1 > 3){
System.out.println("Player 1: How many buttons do you take?(1-3)");
player2 = in.nextInt();
}
System.out.println("Player 1, you lose.");
}
return x;
}
public static int pvc1(int buttonNum){
Scanner in = new Scanner(System.in);
int player1 = 0;
int x = 0; //determines who wins
ButtonsLab [] aiChoice;
aiChoice = new ButtonsLab[buttonNum];
for(int i = 0; i < aiChoice.length; i++){
aiChoice[i].fillMyArray();
}
while (buttonNum > 1){
while (player1 < 1 || player1 > 3){
System.out.println("Player 1: How many buttons do you take?(1-3)");
player1 = in.nextInt();
}
buttonNum -= player1;
int rnd = new Random().nextInt(aiChoice.length);
System.out.println("AI selects " + rnd);
player1 = 0;
}
return x;
}
public static void main (String[] args)
{
Scanner in = new Scanner(System.in);
int buttonNum = 0;
int gameOpt = 0;
while (buttonNum < 10 || buttonNum > 100){
System.out.println("How many buttons are on the board initially?(10-100)");
buttonNum = in.nextInt();
}
System.out.println("Options: Play against a friend (1) Play against easy computer (2) Play against hard computer (3)");
gameOpt = in.nextInt();
switch(gameOpt){
case 1:
pvp(buttonNum);
break;
case 2:
pvc1(buttonNum);
break;
}
}
}