exception 2

1:unchecked Exception (i.e. runtime exception) VS Check Exception (non-runtime exception)2: Run-time exception VS non-run-time exception?Non-runtime Exceptions: The claim captures that must be displayed in code are either placed in the Try{}catch ()

MODULE 7 Exceptions----------------------------Unexpected situations encountered during normal execution of the programFactors that cause an exception:1) intrinsic factors of the program itself2) external factors, the procedure does not need to pay

The operating system can produce multiple processes, and each process can produce multiple threads1. Threads"Main thread" is main threadsThreads have 4 states: New, run, Interrupted, dead(1) NEW:① is created by inheriting the Thread class:The Run ()

I. Concept of exceptions:When the program is running, we do not anticipate the situation, it prevents the program according to our expected effect execution!Two. All exceptions and errors of the parent class--(Throwable)The Throwable class is the

Jdk5.0 new features: Collection after jdk1.5, there is a parent interface iterable, the appearance of this interface will be extracted iterator method, improve the extensibility. -------------------------------------------------- Enhanced for Loop:

The cursor has been browsed once, in order to improve the robustness of the Plsql program, first to write Plsql exception handling, that is, if the PLSQL code block error, the normal does not go to capture processing, will definitely stop execution,

Original: http://josh-persistence.iteye.com/blog/2200644First, the basic introductionWhen designing the relational database, we should design a reasonable relational database to conform to different specifications, and the different norm

One, please observe the Common convention when you overwrite equals1. You do not need to overwrite the Equals method when any one of the following conditions is trueA, each instance of a class is inherently unique. This is the meaning expressed by

Optimize your programs with Java code specifications to optimize memory usage and prevent memory leaksThe resources available to the program (memory, CPU time, network bandwidth, etc.) are limited, and the purpose of optimization is to allow the

Java-based custom exceptions Oh, Mom, another exception! As the saying goes: "code abused me thousands of times, and I am waiting for code to be like my first love ". Alan has been busy with his work recently and has not been writing anything for a

Webdriver synchronization Settings Common wait classes are shown in the mainNote: Support.ui packet class mainly realizes the explicit wait function, and the timeouts () method mainly realizes the recessive wait function.One. Thread

Java code optimizationThe resources available to the program (memory, CPU time, network bandwidth, etc.) are limited, and the purpose of optimization is to allow the program to complete the scheduled tasks with as few resources as possible.

ABy default, the swap action is completed by the swap algorithm provided by the standard library:Namespace Std { template void Swap (t& A, t& b) { T temp (a); A = b; b = temp; } }This function is at the heart of

11th Chapter Exception HandlingI. Classification of anomalies1, controllable type exception:(1) IOException: When sending some kind of I/O exception;(2) SQLException: Exceptions to database access or other errors(3) ClassNotFoundException: Class not

The java.io package contains almost all the required classes for operation input and Output. All of these flow classes represent the input source and output Destination.The streams in the Java.io package support many formats, such as basic types,

A lot of people in the analysis of demand, the use of the East pull gourd West pull Scoop way, listed a lot of demand points, but when you read, you still do not know what to do!! ----written in front.Use cases, English names using case, English and

It takes a lot of time to execute a catch code block and throw an exception. In this process, the performance loss is mainly caused by obtaining a snapshot of the thread stack when an exception is created. To throw an exception, you must first

Delphi7 uses the Windows development language, so it uses the working mechanism of windows. Its core is three: 1) window: the operating system continuously monitors the activity or event signals of each window. 2) Event: it can be a user event or a

Use Redis to implement locks (Supporting Distributed applications) (organizing network data), redisImplement locks using Redis (supports distributed applications) 1. Introduction Use Redis commands such as setnx, expire, and getset to access mutex

Does the parent class of the Java subclass conflict with the method/function of the interface to be implemented? java Functions The answer is, no. Child classes give priority to the methods that implement the parent class, although the methods of