March 14, 2024 - Error as illustrated in Figure 1. The error can be defined as an abnormal condition that indicates something has gone wrong with the execution of the program. These are not handled by Java programs. There are some important methods available in the Throwable class which are as follows: public String getMessage() – Provides information about the exception that has occurred through a message, which is initialized in the Throwable constructor.

January 8, 2024 - When a program evaluates an arithmetic operation and it results in some exceptional condition, it throws ArithmeticException. In addition, ArithmeticException applies to only int and long data types. For instance, if we try to divide an integer by zero, we get an ArithmeticException: int illegalOperation = 30/0; // Throws ArithmeticException · Java allows typecasting between the objects in order to support inheritance and polymorphism.

This page provides a complete list of all public exceptions and errors available in the Java API, grouped by package.

Like IOException, this exception may be thrown when connecting with a database. Most often, though, it indicates a problem with how the database rejected the SQL provided by the application. This may be due to a few things: ... Databases aren’t always the most helpful at determining the exact problem. When investigating, consider turning up logging to see the exact SQL query in question. SQLException is also thrown by the Java API for formulating and transmitting queries.

close() delimiter() findInLine() findWithinHorizon() hasNext() hasNextBoolean() hasNextByte() hasNextDouble() hasNextFloat() hasNextInt() hasNextLine() hasNextLong() hasNextShort() locale() next() nextBoolean() nextByte() nextDouble() nextFloat() nextInt() nextLine() nextLong() nextShort() radix() reset() useDelimiter() useLocale() useRadix() Java File Methods Java FileInputStream Java FileOutputStream Java BufferedReader Java BufferedWriter Java Iterator Methods Java Collections Methods Java System Methods Java Errors & Exceptions · Java Examples Java Compiler Java Exercises Java Quiz Java Server Java Syllabus Java Study Plan Java Interview Q&A Java Certificate · ❮ Previous Next ❯ · The table below shows a list of common Error and Exception types in Java: Java Errors Tutorial ·

Built-in Exceptions in Java are categorized into two categories Checked Exceptions and Unchecked Exceptions. Checked Exceptions: The checked exceptions are handled by the programmer during writing the code, they can be handled using the try-catch block. These exceptions are checked at compile-time. Unchecked Exceptions: The unchecked exceptions are not handled by the programmer. These exceptions are thrown on run-time. Some of the unchecked exceptions are NullPointerException, ArrayIndexOutOfBoundsException, ArithmeticException, etc.

October 25, 2022 - There are more complicated examples of unchecked exceptions as well. The most frequent unchecked exception is called NullPointerException. It’s also among the top 4 Java exceptions Raygun users encounter. NullPointerException happens when your app tries to use null where an object is required. This can be caused by different reasons such as accessing an uninitialized variable or calling the instance method of a null object.

These exceptions cannot simply be ignored, the programmer should take care of (handle) these exceptions. For example, if you use FileReader class in your program to read data from a file, if the file specified in its constructor doesn't exist, then a FileNotFoundException occurs, and the compiler prompts the programmer to handle the exception. import java.io.File; import java.io.FileReader; public class FilenotFound_Demo { public static void main(String args[]) { File file = new File("E://file.txt"); FileReader fr = new FileReader(file); } }

July 23, 2025 - The following program illustrates how to create your own exception class MyException. Details of account numbers, customer names, and balance amounts are taken in the form of three arrays. In main() method, the details are displayed using a for-loop. At this time, a check is done if in any account the balance amount is less than the minimum balance amount to be apt in the account. If it is so, then MyException is raised and a message is displayed “Balance amount is less”. ... // Java program to demonstrate user defined exception // This program throws an exception whenever balance // amoun

The table below shows some of the most common errors and exceptions in Java, with a short description of each: Tip: For a list of all errors and exception types, go to our Java Errors and Exception Types Reference.

The Error class represents the serious problems that cause the program to abort. They include out of memory error, stack overflow error, and so on. Now, let's see different types of errors in Java. Now, let’s take a look at a coding example to understand exceptions by generating few exceptions.

March 3, 2025 - To prevent this exception, we should ensure that the index used to access an array or collection is within its boundary, i.e., it should be greater than or equal to zero and less than the size of the array or collection. ArrayIndexOutOfBoundsException is a type of IndexOutOfBoundsException that occurs when an attempt is made to access an array at an invalid index. In Java, the indices of an array start at 0 and end at length-1, where length is the number of elements in the array.

October 20, 2025 - Constructs a new exception with the specified detail message, cause, suppression enabled or disabled, and writable stack trace enabled or disabled. ... cause - the cause. (A null value is permitted, and indicates that the cause is nonexistent or unknown.) enableSuppression - whether or not suppression is enabled or disabled · writableStackTrace - whether or not the stack trace should be writable ... Java...

October 17, 2025 - In at #5, featured at the top 10 exceptions in 22% of over a 1,000 applications covered in this post is the IllegalStateException. An IllegalStateException is thrown when you’re trying to use a method in an inappropriate time. ‍ A more realistic Java example would be if you use URLConnection, trying to do something assuming you’re not connected, and get “IllegalStateException: Already Connected”.

November 28, 2022 - For instance, if a program attempts to access a file that is currently unavailable, the method to access the file must either catch or throw a FileNotFoundException. Error - errors are exceptions that happen externally to your Java program. One common example of the error is when the Java virtual machine (JVM) runs out of memory, which will throw an OutOfMemoryError.

Types of Exception in Java with java tutorial, features, history, variables, object, programs, operators, oops concept, array, string, map, math, methods, examples etc.

November 7, 2022 - A NoSuchMethodException in Java occurs when you attempt to invoke a method on an object, but the method doesn't exist within the class or interface of that object. ... Explanation: In this example, the nonExistentMethod() does not exist in the String class. When the main method tries to call it on the str object, a NoSuchMethodException is thrown. InterruptedException is raised when a thread is interrupted while waiting, sleeping, or processing. In Java, threads are used to enhance code efficiency by executing multiple tasks concurrently. This exception occurs when a thread's execution is disrupted while it's paused or waiting.

May 7, 2024 - List of checked & unchecked Java exceptions with links to their corresponding guide. 1.InvocationTargetException 2.NoSuchMethodException....