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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