What are the common causes of NoSuchElementException in Java?

Java is a very common programming language and is widely used. In Java programming, developers may encounter NoSuchElementException exceptions. The NoSuchElementException exception refers to when using the Scanner class to read data from the input stream. If there is no token available in the input stream and you try to call the next method, this exception will be thrown. The following are common reasons for NoSuchElementException exceptions:

1. There are not enough tokens available in the input stream: When calling the next() or nextXXX() method of the Scanner class, it is required that there must be a corresponding type in the input stream. Next token. If there are not enough tokens in the input stream, a NoSuchElementException will be thrown.
2. The hasNext() or hasNextXXX() method is not used for checking: before calling the nextXXX() method, the hasNextXXX() method must be called first for checking. Otherwise, if there is no available token, a NoSuchElementException will be thrown.
3. Incorrect format: If the data format in the input stream is incorrect, a NoSuchElementException will be thrown. When using the Scanner class to read data from the input stream, if it encounters incorrectly formatted data, the Scanner class will automatically throw a NoSuchElementException exception.
4. The input stream has ended: When the input stream ends, if you continue to call the next() or nextXXX() method, a NoSuchElementException exception will be thrown.
5. The input stream contains illegal characters: If the input stream contains illegal characters, the Scanner class will automatically throw a NoSuchElementException exception.

When developing a Java program, if you encounter a NoSuchElementException exception, the developer needs to check the code to ensure that the input stream contains enough tokens, and use the hasNext() or hasNextXXX() method to check, and the correct Handle formatting and illegal characters.

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