我是数组的新手。
我创建的这个程序是对BlueJays类中的每个方法抛出一个越界错误。
说实话，我甚至不确定我是否正在搜索阵列。任何帮助将不胜感激。
由于
这是我的主要
public class Lab1 {
static final int NBPLAYERS = 11;
static final int NBMONTHS = 6;
public static void main(String[] args) {
String[] month = {"April", "May","June", "July", "August","September"};
String[] players = {"Colabello","Donaldson","Smoak","Martin","Goins","Encarnacion","Carrera","Tulowitzki","Pillar","Bautista","Travis"};
double[][] battingAvg = {
{0,.368,.300,.224,.386,.268},
{.319,.306,.269,.287,.324,.296},
{.229,.310,.213,.191,.203,.262},
{.197,.327,.239,.256,.138,.213},
{.276,.236,.172,.240,.314,.279},
{.205,.225,.303,.241,.407,.279},
{0,.302,.282,.244,.333,.231},
{0,0,0,.357,.214,.237},
{.273,.181,365,.283,.240,.323},
{.164,.295,.226,.219,.286,.293},
{.325,.189,.313,.368,0,0}};
double [][] onBase = {
{.417,.330,.286,.413,.362,.429},
{.370,.373,.322,.370,.408,.403},
{.372,.333,.275,.283,.243,.324},
{.367,.362,.329,.322,.263,.300},
{.323,.278,.221,.286,.442,.347},
{.258,.333,.382,.384,.460,.411},
{0,.357,.333,.277,.333,.313},
{0,0,0,.400,.325,.250},
{.297,.237,.380,.323,.283,.363},
{.325,.418,.388,.300,.370,.436},
{.393,.246,.313,.421,0,0}};
PlayerStats Player;
BlueJays team = new BlueJays(NBPLAYERS, NBMONTHS);
team.getHighestSingleMonthBattingAvg();
team.getHighestOnBase(5);
team.getLowestBattingAvg(6);
team.getBestMonth("Bautista");
team.getBestOverallRecord();
team.getLowestOnBase();
}
}
这是我的PlayerStats，它有accessor / mutator方法。
class PlayerStats {
private String name;
private int month;
private double battAvg, onBase;
public PlayerStats(String name, int month, double battingAvg, double onBase2) {
this.name = name;
this.month = month;
this.battAvg = battingAvg;
this.onBase = onBase2;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getMonth() {
return month;
}
public void setMonth(int month) {
this.month = month;
}
public double getAvg() {
return battAvg;
}
public double getOnBase() {
return onBase;
}
public double getBoth() {
return battAvg + onBase;
}
}
这是创建2d数组的类。
class BlueJays {
int nbPlayers;
int nbMonths;
int j = 0;
int highestBattingAvg;
int highestBattingMonth;
String highestBattingPlayer;
int highestOnBase;
int lowestAvg;
String lowestAvgPlayer;
int highestOverall;
String highestOverallPlayer;
int lowestOnBase;
int lowestOnBaseMonth;
String highestOnBasePlayer;
double bestOverAllMonth;
public BlueJays(int nbplayers2, int nbmonths2) {
this.nbPlayers = nbplayers2;
this.nbMonths = nbmonths2;
}
PlayerStats[][] stats = new PlayerStats[nbPlayers][nbMonths];
PlayerStats setPlayerStatsCell(PlayerStats player, int iPlayer, int iMonth) {
return player;
}
PlayerStats getHighestSingleMonthBattingAvg() {
while(j < nbMonths) {
for(int i = 0; i < nbPlayers; i++) {
stats[i][j].getAvg();
if(highestBattingAvg < stats[i][j].getAvg()) {
highestBattingMonth = stats[i][j].getMonth();
highestBattingPlayer = stats[i][j].getName();
}
if (i == nbMonths) {
j++;
i = 0;
}
System.out.println("Highest average batting player for the month " + highestBattingMonth + " is " + highestBattingPlayer);
}
}
return null;
}
PlayerStats getHighestOnBase(int month) {
while(j < nbMonths) {
for(int i = 0; i < nbPlayers; i++) {
stats[i][month].getOnBase();
if(highestOnBase < stats[i][month].getOnBase()) {
highestOnBasePlayer = stats[i][month].getName();
}
if (i == nbMonths) {
j++;
i = 0;
}
System.out.println("Highest average onBase player for the month " + month + highestOnBasePlayer);
}
}
return null;
}
public PlayerStats getLowestBattingAvg(int month) {
while(j < nbMonths) {
for(int i = 0; i < nbPlayers; i++) {
stats[i][month].getOnBase();
if(lowestAvg > stats[i][month].getAvg()) {
lowestAvgPlayer = stats[i][month].getName();
}
if (i == nbMonths) {
j++;
i = 0;
}
System.out.println("Lowest average batting player for the month " + month + " is " + lowestAvgPlayer);
}
}
return null;
}
PlayerStats getBestMonth(String player) {
while(j < nbMonths) {
for(int i = 0; i < nbPlayers; i++) {
stats[i][j].getBoth();
if(bestOverAllMonth > stats[i][j].getAvg() && stats[i][j].getName().contains(player)) {
bestOverAllMonth = stats[i][j].getBoth();
}
if (i == nbMonths) {
j++;
i = 0;
}
System.out.println("Best month for the player " + player + " is " + bestOverAllMonth);
}
}
return null;
}
public String getBestOverallRecord() {
while(j < nbMonths) {
for(int i = 0; i < nbPlayers; i++) {
stats[i][j].getBoth();
if(highestOverall < stats[i][j].getBoth()) {
highestOverallPlayer = stats[i][j].getName();
}
if (i == nbMonths) {
j++;
i = 0;
}
System.out.println("Highest overall record is " + highestOverallPlayer);
}
}
return null;
}
public PlayerStats getLowestOnBase() {
while(j < nbMonths) {
for(int i = 0; i < nbPlayers; i++) {
stats[i][j].getOnBase();
if(lowestOnBase > stats[i][j].getOnBase()) {
double lowestOnBase = stats[i][j].getOnBase();
if(lowestOnBase > 0) {
lowestAvgPlayer = stats[i][j].getName();
} else {
i++;
}
if (i == nbMonths) {
j++;
i = 0;
}
}
System.out.println("Lowest On Base is " + lowestOnBase);
}
}
return null;
}
}
这是例外
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0
at BlueJays.getHighestSingleMonthBattingAvg(BlueJays.java:42)
at Lab1.main(JonathanRoy_Lab1.java:40)
答案 0 :(得分：2)
你的问题可能在这里：
// ... lots of other stuff
public BlueJays(int nbplayers2, int nbmonths2) {
this.nbPlayers = nbplayers2;
this.nbMonths = nbmonths2;
}
PlayerStats[][] stats = new PlayerStats[nbPlayers][nbMonths];
如果您初始化BlueJay - 类的实例，则会在设置值nbPlayers和nbMonths之前创建数组。所以你将拥有一个大小为0和0的数组。
为避免这种情况，您必须执行以下操作：
// ... lots of other stuff
public BlueJays(int nbPlayers, int nbMonths) {
this.nbPlayers = nbPlayers;
this.nbMonths = nbMonths;
// doesn't matter if you take the parameters or fields
this.stats = new PlayerStats[nbPlayers][nbMonths];
}
希望我能帮助你：）
答案 1 :(得分：0)
我不知道异常是什么，但这是我通过扫描代码得到的。
j，因此大多数函数调用都不会超过第一次比较。 team.getLowestBattingAvg(6);使用索引6，但自nbMonths=6以来，您可以使用的最高索引是5（索引从0到5，包括0和5）。