java - 如何更改 Java 中创建的对象

Question

以下代码一直有效，直到用户输入团队的分数 int homeScore = input.nextInt() ，此时编译器返回以下错误代码:

Exception in thread "main" java.util.NoSuchElementException
    at java.util.ArrayList$Itr.next(ArrayList.java:854)
    at assignment.PremierLeagueManager.main(PremierLeagueManager.java:121)
Java Result: 1  

有什么办法可以解决这个问题吗？

boolean validHome = false;
boolean validAway = false;
System.out.println("Enter name of Home team: ");
String homeName = input.next();

Iterator<FootballClub> it = premierLeague.iterator();
while (it.hasNext()) {
    if (it.next().getClubName().equals(homeName)) {
        validHome = true;
    }
}

System.out.println("Enter name of Away team: ");
String awayName = input.next();
Iterator<FootballClub> it2 = premierLeague.iterator();

while (it2.hasNext()) {
    if (it2.next().getClubName().equals(awayName)) {
        validAway = true;
    }
}

if (validHome == true && validAway == true) {
    System.out.println("Enter number of goals scored by " + homeName + ":");
    int homeScore = input.nextInt();
    int x = premierLeague.indexOf(it.next());
    premierLeague.get(x).setGoalsScored(homeScore);

    System.out.println("Enter number of goals scored by " + awayName + ":");
    int awayScore = input.nextInt();
    int y = premierLeague.indexOf(it2.next());
    premierLeague.get(y).setGoalsScored(awayScore);
} else {
    System.out.println("One of the teams are invalid. Please try again");
}

Answer 1

在执行“while (it.hasNext())”的顶部，该循环会一直循环，直到迭代器不再有任何项目，因此当您到达“int x = primeLeague.indexOf(it.next());”时"，迭代器没有下一个项目，因此您没有得到这样的元素。如果你想重新开始，你需要创建一个新的迭代器。