本文介紹了使用掃描儀時(shí)出現(xiàn)NoSuchElement異常的處理方法，對大家解決問題具有一定的參考價(jià)值，需要的朋友們下面隨著小編來一起學(xué)習(xí)吧！
問題描述
我試圖在程序中使用Scanner第二次從控制臺獲取輸入，但在調(diào)用另一個(gè)方法中的第二個(gè)Scanner時(shí)，出現(xiàn)了NoSuchElement異常。
如果我從運(yùn)行startMenu()中刪除startMenu()，它會(huì)正常運(yùn)行，但由于某種原因，在運(yùn)行后它會(huì)拋出異常。
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
}
}
推薦答案
GARDEN.startMenu();// method id not a static one.
您不能以這種方式訪問它。您必須初始化類或使您的方法成為靜態(tài)方法。什么是GARDEN？
確定，您現(xiàn)在可以編輯代碼了。
再次
GARDEN.fileReader(GARDEN.fileName); // you are parsing input argument
// But method in your class is no argument method
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