Java Exceptions

July 28, 2023

Java Exceptions

In Java, an exception is an event that occurs during the execution of a program that disrupts the normal flow of the program’s instructions.
When an exception occurs, the normal flow of the program is interrupted and the program’s control is transferred to an exception handler.
Java has two types of exceptions: checked exceptions and unchecked exceptions.
To understand more about Java Exceptions, Read the Complete Article.

Java Exceptions may occur for following Reasons: Some of them are:

Programming errors: These types of exceptions occur due to logical or syntax errors in the program code. For example, trying to access an array element that is out of bounds or attempting to divide by zero.
Environmental issues: These types of exceptions occur when the program encounters issues related to the environment it is running in. For example, a network connection failure, running out of memory, or file I/O errors.
User input errors: These types of exceptions occur when the program receives invalid or unexpected input from the user. For example, trying to parse a string that cannot be converted to a number or trying to access a file that does not exist.
External dependencies: These types of exceptions occur when the program depends on external resources that are not available or accessible. For example, attempting to access a database that is down or a web service that is not responding.
Security issues: These types of exceptions occur when the program encounters security-related issues such as unauthorized access or authentication failures.

checked exceptions and unchecked exceptions.

Checked exceptions are exceptions that the compiler requires the programmer to handle or declare.

unchecked exceptions are exceptions that the programmer is not required to handle or declare.

Java Exception hierarchy

Introduction to java

static variable in java

If statement in Java

Switch Statement in Java

Abstraction in Java

Java Exception Types

Checked Exceptions: These are exceptions that the Java compiler requires the programmer to handle or declare.

These exceptions are typically caused by external factors that are outside of the program’s control, such as file I/O errors or network connectivity issues. Examples of checked exceptions include IOException, SQLException, and ClassNotFoundException

RuntimeExceptions

A RuntimeException is a type of error that occurs during the execution of a program. Unlike checked exceptions, which are checked by the compiler at compile time, RuntimeExceptions are unchecked, meaning they are not verified by the compiler and can occur at runtime.

Unchecked Exceptions: These are exceptions that the Java compiler does not require the programmer to handle or declare.

These exceptions are typically caused by programming errors or logical errors in the code. Examples of unchecked exceptions include NullPointerException, ArrayIndexOutOfBoundsException, and ArithmeticException.

IOExceptions

IOException is a type of exception in the Java programming language that indicates an input/output (I/O) error has occurred. In other words, an IOException is thrown when a problem occurs while reading from or writing to a file, socket, or other I/O stream.

Errors – In general, an error is a mistake or fault that is made when something is being done. The term “error” is often used in different contexts, such as in computing, mathematics, science, and everyday life, to describe a deviation from what is expected, correct, or desired.

In computing, an error is an unexpected or incorrect behavior that occurs when a program or system is executed. This can be caused by various factors, such as incorrect input data, a bug in the code, or a failure in hardware or software components.

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Java Exceptions

Java Exceptions