Class Java.util.nosuchelementexception Error
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Java How to fix java.util.NoSuchElementException in Java java.util.NoSuchElementException is a RuntimeException which can be thrown java.util.nosuchelementexception scanner by different classes in Java like Iterator, Enumerator, Scanner or
Nosuchelementexception Java
StringTokenizer. All of those classes has method to fetch next element or next tokens java no such element exception no line found if underlying data-structure doesn't have any element Java throws "java.util.NoSuchElementException". Most common example of this iterating over hashmap without checking if there is any java.util.nosuchelementexception iterator element or not and that's why it's advised to use hashNext() before calling next() on Iterator. In this Java tutorial we will what causes NoSuchElementException in Java and how to avoid it completely. Cause of Exception in thread "main" java.util.NoSuchElementException: here are possible cause of java.util.NoSuchElementException in Java:
Throw Nosuchelementexception
1) As per Javadoc NoSuchElementException is thrown if you call nextElement() method of Enumeration and there is no more element in Enumeration. below code will throw java.util.NoSuchElementException because Enumeration of hastable is empty. public class NoSuchElementExceptionDemo{ public static void main(String args[]) { Hashtable sampleMap = new Hashtable(); Enumeration enumeration = sampleMap.elements(); enumeration.nextElement(); //java.util.NoSuchElementExcepiton here because enumeration is empty } } Output: Exception in thread "main" java.util.NoSuchElementException: Hashtable Enumerator at java.util.Hashtable$EmptyEnumerator.nextElement(Hashtable.java:1084) at test.ExceptionTest.main(NoSuchElementExceptionDemo.java:23) Here is another example of java.util.NoSuchElementException which will be thrown because we are calling next() method of Iterator which doesn't contain any element: public class NoSuchElementExceptionExample { public static void main(String args[]) { HashMap sampleMap = new HashMap(); Iterator itr = sampleMap.keySet().iterator(); itr.next(); //java.util.NoSuchElementExcepiton here because iterator is empty } } Exception in thread "main" java.util.NoSuchElementException at java.util.HashMap$HashIterator.nextEntry
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No Such Element Exception Java Stringtokenizer
Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only http://javarevisited.blogspot.com/2012/02/how-to-solve-javautilnosuchelementexcep.html takes a minute: Sign up NoSuchElementException with Java.Util.Scanner up vote 10 down vote favorite I am very new to Java but am working through the book Java: How to program (9th ed.) and have reached an example where for the life of me I cannot figure out what the problem is. Here is a (slightly) augmented version of the sourcecode example http://stackoverflow.com/questions/13729294/nosuchelementexception-with-java-util-scanner in the textbook: import java.util.Scanner; // uses lib class Scanner public class Addition { // main method begins execution of java program public static void main ( String[] args ) { // creates a scanner to obtain input from a command window Scanner input = new Scanner( System.in ); int number1; // first number to add int number2; // second number to add int sum; // sum of 1 & 2 System.out.print ("Enter First Integer: " ); // prompt number1 = input.nextInt(); // reads first number inputted by user System.out.print ("Enter Second Integer: "); // prompt 2 number2 = input.nextInt(); // reads second number from user sum = number1 + number2; // addition takes place, then stores the total of the two numbers in sum System.out.printf( "Sum is %d\n", sum ); // displays the sum on screen } // end method main } // end class Addition I am getting the 'NoSuchElementException' error: Exception in thread "main" java.util.NoSuchElementException at java.util.Scanner.throwFor(Scanner.java:838) at java.util.Scanner.next(Scanner.java:1461) at java.util.Scanner.nextInt(Scanner.java:2091) at java.util.Scanner.nextInt(Scanner.java:2050) at Addition.main(Addition.java:16) Enter First Integer: I understand that this is probably due to something in
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and http://stackoverflow.com/questions/3852910/what-is-the-java-nosuchelementexception-error policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags https://examples.javacodegeeks.com/java-basics/exceptions/java-util-nosuchelementexception-how-to-solve-nosuchelementexception/ Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only no such takes a minute: Sign up What is the Java: NoSuchElementException error? up vote 0 down vote favorite Looking for help with the following code... package pkgPeople; import java.io.File; import java.io.PrintWriter; import java.util.Scanner; public class CreateWithoutSerialization { public static void main(String[] args) throws Exception { BankAccount bankAccount = new BankAccount(0, 0); Person person = new Person(); String nm; int ht; int wt; no such element long ba; double bal; File inFile = new File("G:/CS9.27/inperson.txt"); File outFile = new File("G:/CS9.27/outperson.txt"); PrintWriter writer = new PrintWriter(outFile); Scanner reader = new Scanner(inFile); nm = reader.nextLine(); ht = reader.nextInt(); wt = reader.nextInt(); ba = reader.nextLong(); bal = reader.nextDouble(); person.setName(nm); person.setHeight(ht); person.setWeight(wt); bankAccount.setAcctID(ba); bankAccount.setBalance(bal); System.out.println(person.toString()); //Write the attributes in ASCII to a file writer.printf("%s is the name of the person.\r\n",nm); writer.printf("%d inches is the height of %s.\r\n",ht, nm); writer.printf("%d pounds is the weight of %s\r\n",wt,nm); writer.printf("%d dollars is the balance of %s\r\n", bal, nm); writer.printf("%l is the ID of the bank account.\r\n", ba); } } Upon running, i get this exception.. Exception in thread "main" java.util.NoSuchElementException: No line found at java.util.Scanner.nextLine(Unknown Source) at pkgPeople.CreateWithoutSerialization.main(CreateWithoutSerialization.java:23) Is this a file error? Have tried multiple fixes but still stuck. java exception share|improve this question edited May 11 '15 at 17:48 JabberwockyDecompiler 1,54811940 asked Oct 4 '10 at 4:50 D. Spigle 1011210 Can you provide code for Person class? –Shekhar Oct 4 '10 at 4:56 What have you tried and im curious to find out in your words, what the sta
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