What does the JVM do when an exception occurs How do you catch an exception?

What does the JVM do when an exception occurs How do you catch an exception?

The JVM spins itself up and prepares the execution environment. The JVM creates a thread which will run the main() method using whatever command-line parameters are applicable. The JVM sets a default uncaught exception handler that prints the exception to standard error and terminates. The JVM executes the thread.

What is the purpose of declaring exceptions How do you declare an exception in a method and where can you declare multiple exceptions in a method header?

The purpose of declaring exceptions is to tell the Java runtime system what can go wrong. You declare an exception using the throws keyword in the method declaration. You can declare multiple exceptions, separated by commas.

Can you declare multiple exceptions in a method header How?

Yes, declare multiple exceptions in a method header are possible. If the method declares multiple exceptions, add list of the exceptions, separated by commas, after throws.

How can the program ensure that the file will be closed if an exception occurs on the writeData call?

How can the program ensure that the file will be closed if an exception occurs on the writeData call? The program should declare the PrintWriter variable in a try-with-resources statement to ensure that the file is closed.

What is the purpose of the throw statement?

The throw statement throws a user-defined exception. Execution of the current function will stop (the statements after throw won’t be executed), and control will be passed to the first catch block in the call stack. If no catch block exists among caller functions, the program will terminate.

Which string class method will remove spaces from the beginning and the end of a string?

trim()

How do you remove spaces in ArrayList?

Removing spaces from an ArrayList

1. public ArrayList removeSpace()
2. {
3. Iterator it = array.iterator();
4. while (it.hasNext())
5. {
6. if (it.next().equals(” “))
7. {
8. it.remove();

Under which condition will the PrintWriter constructor generate a FileNotFoundException?

exist, a FileNotFoundException occurs when the Scanner object is constructed. The PrintWriter constructor can generate this exception if it cannot open the file for writing.

How is nextLine () different from other scanner methods?

It can’t read two words separated by a 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 ). Once the input is read, nextLine() positions the cursor in the next line.

What does nextLine () do?

The nextLine() method of the java. util. Scanner class scans from the current position until it finds a line separator delimiter. The method returns the String from the current position to the end of the line.

Why nextLine is not working after nextInt?

That’s because the Scanner. nextInt method does not read the newline character in your input created by hitting “Enter,” and so the call to Scanner. nextLine returns after reading that newline.

What is SC nextLine () in Java?

nextLine() method advances this scanner past the current line and returns the input that was skipped. This method returns the rest of the current line, excluding any line separator at the end.

Why we use SC close () in Java?

Scanner. close() method closes this scanner. If this scanner has not yet been closed then if its underlying readable also implements the Closeable interface then the readable’s close method will be invoked.

How do I use scan nextLine?

Example 1

1. import java.util.*;
2. public class ScannerNextLineExample1 {
3. public static void main(String args[]){
4. Scanner scan = new Scanner(System.in);
5. System.out.print(“Enter Item ID: “);
6. String itemID = scan.nextLine();
7. System.out.print(“Enter Item price: “);
8. String priceStr = scan.nextLine();

What is scanner hasNext ()?

Basic Usage. The hasNext() method checks if the Scanner has another token in its input. A Scanner breaks its input into tokens using a delimiter pattern, which matches whitespace by default. That is, hasNext() checks the input and returns true if it has another non-whitespace character.

What is the difference between nextInt and nextLine?

nextLine() reads the remainder of the current line even if it is empty. nextInt() reads an integer but does not read the escape sequence “\n”. next() reads the current line but does not read the “\n”.

Does hasNextInt skip whitespace?

The default whitespace delimiter used by a scanner is as recognized by Character . isWhitespace . The next() and hasNext() methods and their primitive-type companion methods (such as nextInt() and hasNextInt() ) first skip any input that matches the delimiter pattern, and then attempt to return the next token.

What is hasNext () in Java?

The hasNext() is a method of Java Scanner class which returns true if this scanner has another token in its input. There are three different types of Java Scanner hasNext() method which can be differentiated depending on its parameter. Java Scanner hasNext () Method. Java Scanner hasNext (String pattern) Method.

What is the difference between next () and hasNext () methods?

hasNext() : hasNext() method returns true if iterator have more elements. next() : next() method returns the next element and also moves cursor pointer to the next element. hasNext() – Returns true if the iteration has more elements.

What is scanner method in Java?

The Scanner class is used to get user input, and it is found in the java.util package. To use the Scanner class, create an object of the class and use any of the available methods found in the Scanner class documentation.

Why do we get 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. The NoSuchElementException is thrown by the following: iterator::next()

How do I fix NoSuchElementException?

lang. NoSuchElementException in Java , It 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 handle NoSuchElementException?

Handling NoSuchElementException : catch blocks to handle the exception and also ‘NoSuchElementException’ WebDriver Exception Class needs to be used in the catch block as shown in the below code: 2. Hover the mouse over the ‘NoSuchElementException’ error in the above image and select ‘import NoSuchElementException org.

How do you handle an element not found exception?

You should place the findelement in a try/catch block, so that if the element is not found you can catch the exception and do the correct thing.

Why do we get WebDriver exception?

This Selenium exception occurs happens when the web element is detached from the current DOM. The WebDriver is acting after you quit the browser. Thrown when there is not enough time for a command to be completed. Exception is used as a placeholder in case if the server returns an error without a stack trace.

How do you refresh a page without using context?

How to refresh a page without using context click

1. Using sendKeys method. driver.findElement(By.id(“firstname-placeholder”)).sendKeys(Keys.F5);
2. Using navigate.refresh() method. driver.navigate().refresh();
3. Using navigate.to() method. driver.navigate().to(driver.getCurrentUrl());
4. Using get() method.

Can we have multiple catches after a single try?

You cannot have multiple try blocks with a single catch block. Each try block must be followed by catch or finally.

Can we have multiple catch block?

There can be multiple catch blocks, but only the one that first matches the exception type is executed. That means you need to order the catch blocks properly. Yes, we can write multiple catch blocks in a program , but the child exception (like NullRefernceException, OutOfIndexRangeException etc.)

How can I add two exceptions in one catch?

Before Java 7, we used to catch multiple exceptions one by one as shown below. If a catch block handles multiple exceptions, you can separate them using a pipe (|) and in this case, exception parameter (ex) is final, so you can’t change it. The byte code generated by this feature is smaller and reduce code redundancy.

Can we try without catch block?

Yes, It is possible to have a try block without a catch block by using a final block. As we know, a final block will always execute even there is an exception occurred in a try block, except System.