英文:
NoSuchElementException in nextInt() no matter what I do to the code
问题
public class MinimumElement {public void readIntegers(int userCount) {int count = userCount;int intArray[] = new int[count];Scanner scan = new Scanner(System.in);for (int i = 0; i <= count - 1; i++) {int number;System.out.println("Please input number ");number = scan.nextInt();intArray[i] = number;}scan.close();}public static void main(String[] Args) {Scanner scan = new Scanner(System.in);System.out.println("Please enter the number of elements required for array");int userInput = scan.nextInt();scan.nextLine();scan.close();MinimumElement min = new MinimumElement();min.readIntegers(userInput);}}
已尝试使用hasNextInt和hasNextLine与if条件。它们始终返回false作为结果值。
英文:
public class MinimumElement {public void readIntegers(int userCount) {int count = userCount;int intArray[] = new int[count];Scanner scan = new Scanner(System.in);for (int i = 0; i <= count - 1; i++) {int number;System.out.println("Please input number ");number = scan.nextInt();intArray[i] = number;}scan.close();}public static void main(String[] Args) {Scanner scan = new Scanner(System.in);System.out.println("Please enter the number of elements required for array");int userInput = scan.nextInt();scan.nextLine();scan.close();MinimumElement min = new MinimumElement();min.readIntegers(userInput);}}
Have tried hasNextInt and hasNextLine with if conditions as well. They are always returning result value as false.
答案1
得分: 0
好的，我相信我可能已经找到了解决方案。问题在于你尝试从System.in读取时的方式：实际上你分配了两个Scanner实例！
int intArray[] = new int[count];Scanner scan = new Scanner(System.in);
还有这里：
Scanner scan = new Scanner(System.in);System.out.println("Please enter the number of elements required for array");
这会导致奇怪的问题。因此，改为像下面的示例中所示创建全局的Scanner实例。
public class MinimumElement {private static final Scanner SCANNER = new Scanner(System.in);public static void main(String[] args) {System.out.println("Please enter the number of elements required for array");try {int userInput = SCANNER.nextInt();SCANNER.nextLine();MinimumElement min = new MinimumElement();min.readIntegers(userInput);} finally {SCANNER.close();}}public void readIntegers(int userCount) {int[] intArray = new int[userCount];for (int i = 0; i <= userCount - 1; i++) {int number;System.out.println("Please input number ");number = SCANNER.nextInt();intArray[i] = number;}}}
请注意，在调用close()后不要与Scanner进行交互，因为这也会导致错误的行为。
英文:
Alright, I believe I might've found a solution to your problem. The issue lies within the way you attempt to read from System.in: you actually allocate two instances of Scanner!
int intArray[] = new int[count];Scanner scan = new Scanner(System.in);
And over there:
Scanner scan = new Scanner(System.in);System.out.println("Please enter the number of elements required for array");
This will cause weird problems. Therefore, instead create a global instance of Scanner like shown in the example below.
public class MinimumElement {private static final Scanner SCANNER = new Scanner(System.in);public static void main(String[] args) {System.out.println("Please enter the number of elements required for array");try {int userInput = SCANNER.nextInt();SCANNER.nextLine();MinimumElement min = new MinimumElement();min.readIntegers(userInput);} finally {SCANNER.close();}}public void readIntegers(int userCount) {int[] intArray = new int[userCount];for (int i = 0; i <= userCount - 1; i++) {int number;System.out.println("Please input number ");number = SCANNER.nextInt();intArray[i] = number;}}}
Note that you must take care not to interact with the Scanner after the invoking close(), as that will result in erroneous behavior as well.
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