Exception in Thread Main java.util.NoSuchElementException no line Found

A surprising, unfortunate event that disturbs the ordinary movement of a program is called an Exception. As a general rule, exceptions are achieved by our program, and these are recoverable. Expect in case our program need to scrutinize data from the remote report arranged in the U.S.A. At runtime, in the event that a remote record isn't open, then, at that point, we will get RuntimeException saying fileNotFoundException. Expecting fileNotFoundException happens, we can give the nearby chronicle to the program to ordinarily examine and go on with the remainder of the program.

NoSuchElementException:

RuntimeException class is the parent class of NoSuchElementException class, and consequently, it is a run time exception. This exemption is raised normally by JVM and given by the accessors procedures for Recognizable proof, Iterator or Tokenizer, for instance, next() or nextElement() or nextToken(), when we are endeavoring to get to the substance of a cluster, grouping, or another thing and expecting that these articles are unfilled then again if we are endeavoring to get next part in the wake of arriving at the finish of an item then we will get java.util.NoSuchElementException.

This error java.util.NoSuchElementException: No line found happens because of the finish of record issue while composing your code. At times it happens that we incorporate the Scanner object without checking regardless of whether there is a possibility for the following line, which is the primary driver behind this mistake. In Java, we have an alternate capability for it known as hasnextLine(). This capability identifies the following line in the text we enter as info.

In the underneath model, we are attempting to get to a HashMap by utilizing the accessor strategy next() of the Iterator class, yet as the HashMap is vacant, we will be going to get NoSuchElementException.

The NoSuchElementException is tossed by an Identification's nextElement() method, which shows that there are no more components left in the count. The NoSuchElementException is tossed by the accompanying Methods:

next() of Iterator interface
next() of NamingEnumeration interface
nextElement() of Enumeration interface
nextElement() of StringTokenizer class

The RuntimeException class is the parent class of the NoSuchElementException class, and it is implemented by the Serializable interface

Constructors present in NoSuchElementException Class

NoSuchElementException(): It develops a NoSuchElementException with next to no blunder message as its string.
NoSuchElementException(String s): It develops a NoSuchElementException, which has a message string s saved which is the reference to the blunder for later recovery by the getMessage method. The string s contains the class name, which tosses the blunder.

Example 1: program to demonstrate the NoSuchElementException.

We are trying to access the element from an empty hashmap. If the hash map is empty, we can't access the elements at that time. We get NoSuchElementException.

HelloWorld1.java

// import required packages
import java.io.*;
import java.lang.*;
import java.util.*;
// class with main
class HelloWorld1 {
	// main method
	public static void main(String[] args)
	{
		System.out.println(" HelloWorld!: ");
		// Creating an object to the HashMap class so that a Hashmap is created
		HashMap<Integer, Integer> hashmap = new HashMap<>();
		// creating an object to the iterator class to access the hashmap
		Iterator itr = map.keySet().iterator();
	    // accessing the hashmap
		itr.next();
	}
}

Output:

Exception in Thread Main java.util.NoSuchElementException no line Found

Example 2: In this program, We are trying to access the element from an empty vector using the Enumeration interface. If the Vector is empty, we can't access the elements at that time. We get NoSuchElementException.

HelloWorld2.java

// import required packages
import java.io.*;
import java.lang.*;
import java.util.*;
// Class with main
class HelloWorld2 {
	// main method
	public static void main(String[] args)
	{
	    System.out.println(" HelloWorld!: ");
		// Creating an object to the Vector class so that a Vector is created
		Vector<Integer> v = new Vector<>();
		// creating a reference to the Enumeration interface such that by using that refrence we can traverse through the Vector
		Enumeration e = v.elements();
		// accessing the elements of the Vector using Enumeration interface
System.out.println(e.nextElement());
	}
}

Output:

Fixing the NoSuchElementException

Essentially all of the classes whose accessor procedures give NoSuchElementExceptioncontains their different system to check whether or not the thing contains more parts. So to avoid this NoSuchElementException we need to call continually.

One of the most widely recognized situations where the NoSuchElementException happens is the point at which we are repeating over an unfilled Set. In the event that we wish to keep away from this special case, wecan put a check prior to repeating the set. While emphasizing, check each time that there is a component present in the set subsequently as follows-

hasMoreElements()
hasMoreToken() method before calling nextToken( ) or next() or nextElement() method
hasNext()

Example 3: Example program to fix NoSuchElementException in HashMap using hasNext() method.

HelloWorld3.java

// import required packages
import java.io.*;
import java.lang.*;
import java.util.*;

// Class with main
class HelloWorld3 {
	// main method
	public static void main(String[] args)
	{
		System.out.println(" HelloWorld!: ");
		// Creating an object to the HashMap class so that a Hashmap is created
		HashMap <Integer, Integer> map = new HashMap <> ();
		// creating an object to the iterator such that by using that object, we can traverse through the HashMap
		Iterator itr = map.keySet().iterator();
		// Before accessing the elements of the HashMap, we are checking if the HashMap contains elements or not by using hasNext() method
		while (itr.hasNext())
		{
			System.out.println(itr.next());
		}
	}
}

Output:

If we compare example 1 and 3, the only difference between them is in example 3, we are checking whether the HashMap has elements or not by using hasNext() method. If the HashMap has the elements, then we are calling the next() method.

Example 4: Example program to fix NoSuchElementException in Vector using hasMoreElements() method.

HelloWorld4.java

// import required packages
import java.io.*;
import java.lang.*;
import java.util.*;

// Class with main
class HelloWorld4 {

	// main method
	public static void main(String[] args)
	{
	    System.out.println(" HelloWorld!: ");
		// Creating an object to the Vector class so that a Vector is created
		Vector<Integer> v = new Vector<>();
	
		// creating a reference to the Enumeration interface such that by using that reference, we can traverse through the Vector
		Enumeration enumerator = v.elements();
		// Before accessing the elements of the Vector, we are checking if the Vector contains elements or not by using hasMoreElements() method
		while (e.hasMoreElements())
		{
System.out.println(e.nextElement());
		}
	}
}

Output:

If we compare examples 4 and 4, the only difference between them is in example 4. We are checking whether the Vector has elements or not by using hasMoreElements() method. If the Vector has the elements, then we are calling the nextElement() method.

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