我正在尝试使用Scanners 在程序中第二次从控制台获取输入，但是当在另一种方法中调用第二次时Scanner，它会出现 NoSuchElement 异常。
如果我startMenu()从运行中删除fileReader()它可以工作，但是由于某种原因在运行后它会引发异常。
public class Garden {
public static final Garden GARDEN = new Garden();
//variable declartaions removed
public static void main(String[] args) {
if (null != args && 0 < args.length) {
GARDEN.fileName = args[0].trim();
}
if (GARDEN.fileName != null) {
GARDEN.fileReader(GARDEN.fileName);
} else {
GARDEN.fileReader();
}
GARDEN.startMenu();
int mainI = 0;
while (mainI != 1000000) {
try {
Thread.sleep(0);
} catch (InterruptedException e) {
}
GARDEN.daysWeather();
GARDEN.anotherDay();
mainI++;
}
}
protected void fileReader() { // asks for file name for config file
System.out.println("Enter File Name Please");
Scanner cmdReader = null;
String cmdInput = null;
try {
cmdReader = new Scanner(System.in);
cmdInput = cmdReader.nextLine();
} catch (NoSuchElementException noSuchElement) {
noSuchElement.printStackTrace();
fileReader(); //throwing error here
}
//code removed
}
protected void startMenu() {// modified code from ATM lab (week2)
int selected = 0;
//code removed
Scanner climateScanner = new Scanner(System.in);
System.out.println("Select a number 1-4");
selected = climateScanner.nextInt();
switch (selected) {
case 1: // semiarid
weatherType = 10; //10% chance to rain
climateScanner.close();
break;
case 2: // arid
weatherType = 20; //5% chance to rain
climateScanner.close();
break;
case 3:
weatherType = 50; //2% chance to rain
tropicalWeather = true;
climateScanner.close();
break;
case 4:
weatherType = 20;//5% chance to rain
storming = true;
climateScanner.close();
break;
default:
System.out.println("Invalid Input try again");
startMenu(); //using Recursion to ask for input again
break;
}
//code removed
}
}