How to Prevent 'java.util.NoSuchElementException' When Using Scanner.nextInt()?

Error Handling for nextInt() in Scanner

When attempting to retrieve an integer using Scanner.nextInt(), users occasionally encounter the error:

java.util.NoSuchElementException
    at java.util.Scanner.throwFor(Scanner.java:907)
    at java.util.Scanner.next(Scanner.java:1530)
    at java.util.Scanner.nextInt(Scanner.java:2160)
    at java.util.Scanner.nextInt(Scanner.java:2119)

This error arises when the input stream contains no integer for nextInt() to read. One method for resolving this is to employ hasNexInt(). This function verifies the presence of an integer before attempting to read it.

Scanner s = new Scanner(System.in);
int choice = 0;

if(s.hasNextInt()) 
{
   choice = s.nextInt();
}

s.close();

This modification ensures that nextInt() is only called when there is an integer available to read, preventing the error. Additionally, it is good practice to close the scanner when finished to release system resources.

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