Java中的扫描行
代码怎么了?它不允许我为每一个版本写输入。我想知道每个版本有多少版本,年份和城市,它跳转到循环中,不允许我输入Java中的扫描行,java,input,java.util.scanner,Java,Input,Java.util.scanner,代码怎么了?它不允许我为每一个版本写输入。我想知道每个版本有多少版本,年份和城市,它跳转到循环中,不允许我输入 public class Competition { private static ArrayList<Edition> editions = new ArrayList<Edition>(); private static Scanner scan = new Scanner(System.in); public static vo
public class Competition {
private static ArrayList<Edition> editions = new ArrayList<Edition>();
private static Scanner scan = new Scanner(System.in);
public static void main(String[] args) {
String newCity = null;
int newYear = 0;
int itineration = 0;
int numberEditions = 0;
Edition newEdition = new Edition(newCity, newYear);
System.out.println("How many editions would you like to create?");
numberEditions = scan.nextInt();
while (itineration < numberEditions) {
System.out.println("\nEnter the city and year of the Edition you would"
+ " like to create: ");
System.out.println("Year: ");
newYear = scan.nextInt();
System.out.println("City: ");
newCity = scan.nextLine();
editions.add(newEdition);
itineration++;
}
for (int index = 0; index < editions.size(); index++) {
System.out.println("Music Festival'" + editions.get(index).getYear()
+ ", "
+ editions.get(index).getCity());
}
}
}
公开课竞赛{
私有静态ArrayList Edition=新ArrayList();
专用静态扫描仪扫描=新扫描仪(System.in);
公共静态void main(字符串[]args){
字符串newCity=null;
int newYear=0;
int巡回=0;
整数预测=0;
版本newEdition=新版本(newCity,newYear);
System.out.println(“您希望创建多少版本?”);
numberditions=scan.nextInt();
while(行程
您需要在while循环中创建Edition
的新实例
while (itineration < numberEditions) {
System.out.println("\nEnter the city and year of the Edition you would"
+ " like to create: ");
System.out.println("Year: ");
newYear = scan.nextInt();
System.out.println("City: ");
newCity = scan.nextLine();
Edition newEdition = new Edition(newCity, newYear);
editions.add(newEdition);
itineration++;
}
while(行程
如果您不知道如何使用Scanner类,它会出现一些问题。R我建议在使用任何一个对象之前研究这两个对象。您犯了两个错误
Scanner.next()
获取输入String
<代码>扫描仪。nextLine()无效 while (itineration < numberEditions)
{
System.out.println("\nEnter the city and year of the Edition you would" + " like to create: ");
System.out.println("Year: ");
newYear = scan.nextInt();
System.out.println("City: ");
newCity = scan.next();
editions.add(new Edition(newCity, newYear));
itineration++;
}
while(行程
你需要在阅读一年后消耗额外的行数。您还需要为每个输入创建新版本,并将其添加到while循环的列表中:
while (itineration < numberEditions) {
System.out.println("\nEnter the city and year of the Edition you would"
+ " like to create: ");
System.out.println("Year: ");
newYear = scan.nextInt();
scan.nextLine();
System.out.println("City: ");
newCity = scan.nextLine();
Edition newEdition = new Edition(newCity, newYear);
editions.add(newEdition);
itineration++;
}
while(行程
希望它有助于为扫描仪创建新对象。现在您可以输入值
newCity = new Scanner(System.in).nextLine();
您得到的错误是什么?您使用的输入是什么?不是错误。它不允许我输入。输入将是一个int,当要求输入城市时,输入将是一个字符串。@elliotfrisch@DirkyJerkyThank you@Sanjeev!这就是我需要的。我不能给代表,因为我没有足够的,否则我会给!非常感谢!