how to create exception in java

The program is difficult to perfect, inevitably have a variety of anomalies. For example, the program itself has a bug, such as the program printing when the printer has no paper, such as insufficient memory. To resolve these exceptions, we need to know why the exception occurred. For some common anomalies, we can also provide a certain response plan. Exception handling in C is done simply by function retur

, the most important thing is to select the exception class name to clearly indicate the exception. ③ Exception objects usually have two constructor types: one is a non-parameter constructor and the other is a constructor with a string, this string will be used as an additional description for this exception object exc

Reprinted from: http://www.51edu.com/it/2008/1120/article_3272.html There are several phenomena that need to be summarized:In Java, the base class of the error class is Java. Lang. error, and the base class of the exception class is Java. Lang. Exception.Similarities: Java.

1. Run-time data areaThe Java Virtual machine divides the memory it manages into several different data regions during the execution of a Java program. These areas have their own uses, as well as the time of creation and destruction: Some regions exist with the start of a virtual machine process Some regions are built and destroyed depending on the start and end of the user thread Accordin

Java exception architecture diagram and several interview questions, java architecture diagram questions 1. java exception Architecture The pink ones are checked exceptions, which must be captured by the try {} catch Block or declared by the throws clause in the method sign

Brief introductionException handling is one of the most important features of the Java language, as explained in the article "Three rules for effective Exception handling": It mainly helps us to solve the following three problems in the debug process. What's wrong? Where's the error? Why error The Java language can be said to provide an over

the Java program does not throw any errors. Most programs throw and capture objects derived from the exception class. An exception indicates a problem, but these are not serious systemic problems. Most of the programs you write will throw and catch exceptions. The exception class defines many subclasses in the

This article begins with the basic concepts and syntax of Java exceptions, introduces the basic knowledge of Java exception handling, analyzes the Java anomaly Architecture, compares the exception processing framework of spring, and expounds the basic principles of

It's hard to be perfect, and there are all kinds of anomalies. For example, the program itself has bugs, such as when the program prints the printer does not have paper, such as insufficient memory. In order to solve these anomalies, we need to know the cause of the abnormal occurrence. For some common anomalies, we can also provide a certain response plan. The exception handling in C language is simply achieved by the function return value, but the m

Learn Java students pay Attention to!!!The learning process encountered any problems or want to acquire learning resources, Welcome to join the Java Learning Exchange Group Number: 618528494 we learn java! together In programming, exception handling is a very critical and important part. The

Exception classification in Java, Java Classification The following describes several common exception types to help you identify program errors when an error occurs: (1) Exception root classes of various exceptions If you do not know where the

Exception Handling is an important part of writing strong Java applications. It is a non-functional requirement of each application and is used to handle any error situations elegantly, such as resource unavailability, illegal input, and empty input. Java provides several exception handling features, using try, catch,

In the Java Core Knowledge interview, you can always encounter questions about handling exception and error. Exception processing is a very important aspect of Java application development and the key to writing robust and stable Java programs, which naturally makes it a fre

() method. java.lang.EnumConstantNotPresentExceptionAn enumeration constant does not have an exception. This exception is thrown when an application attempts to access an enumeration object by name and enumeration type, but the enumeration object does not contain a constant. java.lang.ExceptionThe root exception. Used to describe what the application wants to ca

First, Exception introduction 1. Exception: During the operation of the program, there are some unexpected situations that cause the program to exit. 2. An exception is represented by an object, and all exceptions are directly or indirectly inherited from the Throwable interface. The Throwable interface is a class in the class library Java.lang package

All exception types are subclasses of the built-in class Throwable. Therefore, the throwable is at the top level of the exception class hierarchy. Immediately following Throwable are two subclasses that divide the exception into two different branches. One branch is exception.This class is used for exceptions that the user program might catch. It is also a class

Java Exception Handling involves a lot of principles and theories, and requires a little understanding and optimization. The source code is posted here, which only serves as an image-aware Java exception handling method. 1. Try catch Public class testtrycatch {public static void try () {int I = 1/0; try {} ca

element value:" +a[0]); System.out.println ("The finally statement is executed"); } }}//this will produce the following results:Exception Thrown:java.lang.arrayindexoutofboundsexception:3First element value:6 thefinallyStatement is executedThe following points need to be noted: Catch is not possible without the TRY keyword. A finally block is not enforced in a try/catch statement block. A TRY statement block cannot exist independently (that is, there are no catch and finally

This article Importnew-dug pit master Zhang without permission, prohibit reprint!Exception handling plays a very important role in writing robust Java applications. Exception handling is not a functional requirement, it requires graceful handling of any error conditions, such as resource availability, illegal input, null input, and so on.