Next Page An exception or exceptional event is a problem that arises during the execution of a program. An exception can occur for many different reasons. Following are some scenarios where an exception occurs. A user has entered an invalid data.
That is, a program that runs without any hitch or glitch. Well, if wishes were horses, beggars would ride.
Beyond all the wishes of a programmer, sometimes unforeseen circumstances happen. Exceptions interfere with the smooth running of our code and terminate the program if not handled.
Handling exceptions involves writing another set of code to manage these exceptions when they happen. Exceptions occur when our code runs in unexpected ways which is why exceptions can be considered a kind of bug. These unexpected ways could be dividing a number by zero, trying to access an array at an index that does not exist, or trying to access an object that does not exist.
All these ways results in exceptional code, code that does not follow the normal path or process the program designed. When an exception occurs, a description is reported to the user to explain what caused the unexceptional code.
The act of reporting this exception is called throwing an exception. Exception handling is an integral part of Java; every Java developer needs to understand how to handle exceptions so that they can write clean, elegant code.
Throwing Exceptions A car running on a bad fuel emits smoke so that we know something is wrong—an exception thrown in a Java Program is the equivalent to that smoke. When an exception happens in a Java program, it needs to be reported to the user of the system so that the user understands exactly what went wrong.
By reporting this exception to the user, we are throwing an exception. The programmer can cause an exception to be thrown or the Java language throws the exception. The programmer can cause an exception to be thrown when the user of the program performs some operations that have been clearly started as illegal or incorrect in the program.
Also, the Java language can throw some exceptions if the input to the program violates some basic arithmetic or programming principles like dividing a number by zero and if the environment in which the program is running develops some issues like running out of memory.
So when a Java program throws an exception, what happens? An object of any of the Throwable subclass is created that explains the nature of the exception, depending on its type. For example, an ArithmeticException object can be thrown, which shows that an error in arithmetic occurred.
Any exception that can be thrown from a Java Program is considered to be an object of the Throwable class, which is divided into two subclasses: Exceptions that the programmer cannot handle are in the Error class. Exceptions that you can fix are in the Exception class.Exception handling is an integral part of Java; every Java developer needs to understand how to handle exceptions so that they can write clean, elegant code.
Throwing Exceptions A car running on a bad fuel emits smoke so that we know something is wrong—an exception thrown in a Java Program is the equivalent to that smoke. Exception handling ensures that the flow of the program doesn’t break when an exception occurs.
For example, if a program has bunch of statements and an exception occurs mid way after executing certain statements then the statements after the exception will not . Start studying Chapter 12 JAVA PROGRAMMING Exception Handling and Text I/O. Learn vocabulary, terms, and more with flashcards, games, and other study tools.
So to catch an exception in your program, you need to write a try-catch statement like this: This statement may throw an exception. Java forces you to write the code to deal with.
Exception handling is one of the most important feature of java programming that allows us to handle the runtime errors caused by exceptions. In this guide, we will learn what is an exception, types of it, exception classes and how to handle exceptions in java with examples.
Handling Exceptions In Java. Every programmer wants to write a flawless program. That is, a program that runs without any hitch or glitch. Well, if wishes were horses, beggars would ride. Java provides a powerful way to handle such exceptions which is known as exception handling.
In it we write vulnerable code i.e. code which can throw exception in a separate block called as try block and exception handling code in another block called catch block.