API в Java EE
What does exception in thread main mean?
The Exception in thread “main” suggests that this error has occurred in the main thread, the thread which is responsible for running the Java application. This error can occur to any thread, but if it happens in the main thread, then your program will crash.
What does InputMismatchException mean in Java?
java.util.InputMismatchException. Thrown by a Scanner to indicate that the token retrieved does not match the pattern for the expected type, or that the token is out of range for the expected type.
How do you handle exceptions in thread main Java Util InputMismatchException?
The only way to handle this exception is to make sure that you enter proper values while passing inputs. It is suggested to specify required values with complete details while reading data from user using scanner class.
What does exception in thread main Java Util NoSuchElementException mean?
The NoSuchElementException in Java is thrown when one tries to access an iterable beyond its maximum limit. This means that, this exception is thrown by various accessor methods to indicate that the element being requested does not exist .
How do you handle class not found exception?
How to Resolve ClassNotFoundException in Java
- Find out which JAR file contains the problematic Java class. …
- Check whether this JAR is present in the application classpath. …
- If that JAR is already present in the classpath, make sure the classpath is not overridden (e.g. by a start-up script).
What is exception in thread in Java?
When a method encounters an abnormal condition that it can not handle, an exception is thrown as an exception statement. Exceptions are caught by handlers(here catch block). Exceptions are caught by handlers positioned along with the thread’s method invocation stack.
What is an illegal argument exception Java?
An IllegalArgumentException is thrown in order to indicate that a method has been passed an illegal argument. … It is an unchecked exception and thus, it does not need to be declared in a method’s or a constructor’s throws clause.
Why do we use nextLine in Java?
The nextLine() method of java. util. Scanner class advances this scanner past the current line and returns the input that was skipped. … Since this method continues to search through the input looking for a line separator, it may search all of the input searching for the line to skip if no line separators are present.
What is Java Util NoSuchElementException?
The NoSuchElementException in Java is thrown when one tries to access an iterable beyond its maximum limit. The exception indicates that there are no more elements remaining to iterate over in an enumeration.
What is the difference between nextLine and next in Java?
next() can read the input only till the space. It can’t read two words separated by space. Also, next() places the cursor in the same line after reading the input. nextLine() reads input including space between the words (that is, it reads till the end of line n).
How do you handle input exception in Java?
Here are a couple other things to note about this program:
- The import statement specifies java. util. …
- The next method must be called in the catch block to dispose of the user’s invalid input because the nextInt method leaves the input value in the Scanner’s input stream if an InputMismatchException is thrown.
Why does number format exception occur in Java?
The NumberFormatException occurs when an attempt is made to convert a string with improper format into a numeric value. That means, when it is not possible to convert a string in any numeric type (float, int, etc), this exception is thrown.
How do I fix error is exception in thread main Java Util NoSuchElementException?
NoSuchElementException in Java can come while using Iterator or Enumeration or StringTokenizer. Best way to fix NoSuchElementException in java is to avoid it by checking Iterator with hashNext(), Enumeration with hashMoreElements() and StringTokenizer with hashMoreTokens().
How do you avoid no such element exception?
So in order to avoid this NoSuchElementException we need to always call,
- Iterator. hasNext() or.
- Enumeration. hasMoreElements() or.
- hasMoreToken() method before calling next( ) or nextElement or nextToken() method.
Can we use two scanner in Java?
you can’t do that, instead if you insist you should use the split() method in java.