what runtime exception

Java exceptions are divided into two main categories: checked exceptions and runtime exceptions (runtime Exceptions). All RuntimeException classes and their subclass instances are called runtime exceptions, and exception instances that are not

Ext.: http://hi.baidu.com/iduany/item/20f8f8ed24e1dec5bbf37df7Recent test cases, found such a phenomenon:In the business code, there are two scenarios, such as:throw new RuntimeException ("xxxxxxxxxxxx"); Things Roll backthrow new Exception

A general JDBC abstract framework It's not enough to understand the jdbc api and the issues in using it correctly. using JDBC directly is simply too much effort, and too error-prone. we need not just understanding, but a code framework that makes

1. Simple Description: When an external environment problem that cannot be controlled by the program occurs (the file provided by the user does not exist, the file content is damaged, and the network is unavailable ...) JAVA will use exception

Java basics 1: exception   I think I can write well on the basics of Java. I used to post it on my other blog. It must be original. I will share it with you now. Zookeeper ------------------------------------------------------------------------------

public class ExceptionTypeTest { public void doSomething()throws ArithmeticException{ System.out.println(); } public static void main(){ ExceptionTypeTest ett = new ExceptionTypeTest(); ett.doSomething();

1. Can a ". Java" source file contain more than one class (not an inner class)? What are the restrictions?Can I include more than one class (not an inner class) in a ". Java" source file? What are the restrictions?This is OK, a ". Java" source file

Exception: refers to an exception event that occurs during a program's operation, such as a 0 overflow, an array out of bounds, a file not found, and so on, which prevents the program from running properly.(It is important to note that the literal

I. What is an exceptionAbnormal English words are exception, literal translation is the meaning of "accident, exception", that is, abnormal situation. In fact, exceptions are procedural errors in nature, including procedural logic errors and system

1. The transaction boundary of Spring begins before the calling of the business method and executes a commit or rollback (depending on whether the runtime exception is thrown) after the business method has finished executing.2. If you throw runtime

31. String s = new string ("xyz"); how many stringobject have been created? Can I inherit the String class?Two or one is possible, "XYZ" corresponds to an object, the object is placed in a string constant buffer, and the constant "XYZ" is the one in

The system has organized a bit of questions about Java, including Basic, Javaweb, frame, database, multi-threaded, concurrent articles, algorithms and so on, updated in succession. Other aspects such as the front end and so on the face of the

Exception Handling Mode 2 Throw up throw upPackage cn.seven.shengsiyuan.exception;/* * April 05, 2015 13:05:35 * location:501 * Exception handling Method 2: Throws an exception, by the method that calls the method Handle the exception

Java encapsulates all errors as an object with the root parent class Throwable.There are two subcategories of Throwable: Error and exception.An Error object indicates a program error, which refers to the underlying, low-level, unrecoverable,

Friends to interview asked a lot of abnormal handling problems, daily work encountered is not enough explanation, here write a post to explain.(1) Runtime exception (checked exception): Inherited from Java.lang. RuntimeException classCommon 5

1. What are the similarities and differences between runtime exceptions and general exceptions?Answer: An exception indicates an unhealthy state that may occur during a program run, and a run-time exception that represents an exception that may be

say it today. Java exception handling mechanism, exception handling is not the first contact, especially written a lot C # code, the basic will be written to the exception-handling code, in fact C # the exception handling and Java the exception

Exception handling mechanism Exceptions are unavoidable in the course of a program's operation, such as the exception of 0 overflow, array overrun, and file not being found, which will prevent the program from running properly in the event of

Java Exception Common interview question one, Java exception understandingExceptions are mainly handling errors that cannot be caught at compile time. The problem can continue to execute smoothly, without causing the program to terminate, to ensure

31. String s = new string ("xyz"); how many stringobject have been created? Can I inherit the String class?Two or one is possible, "XYZ" corresponds to an object, the object is placed in a string constant buffer, and the constant "XYZ" is the one in