Recently began to look at Vue, first use the official template to quickly build up the project:
Vue.js provides an official command-line tool that can be used to quickly build large single-page applications. The tool provides an out-of-the-box build tool configuration that brings a modern front-end development process. Create and launch a project with hot reload, static check on save, and build configuration that can be used in a production environment in just a few minutes.
Now the project Webp
Tags: Oracle SQL LoaderThe previous summary of the use of Sql*loader, and today, and then turned out to seeSql*loader can load data from external files into a table in Oracle DB . It has a powerful data analysis engine, so there is no limit to the format of the data in the data file. Sql*loader Use the following files:
input data file : Sql*
Class Loaderfunction: Get binary byte stream by class fully qualified nameUse cases: Class-level partitioning, OSGi, hot deployment, code encryption1, Class and class loaderAny class and the loader that loads the class together establish uniqueness in the virtual machine;Each class has a separate class name space;Determine whether two classes are equal and must be loaded with the same classloader; otherwise, it will affect: equals, IsAssignableFrom, i
OnLoadFinishedThis method is called after the previously created loader has completed its loading process. this method is called before the data applied to the loader is released. in this method, you must delete all the use of old data (because it will be deleted soon), but do not release them by yourself, because their loaders will do these things.
Once you know that the application is no longer using data
. But to run the program, you must first load the. class file into the JVM's memory for use, and the ClassLoader is responsible for loading the. class file on the disk into the JVM memory, as shown in:You can assume that each class object has the. Class bytecode content on the disk, and each class object has a getClassLoader () method to get the one who loaded me from the. class file into memory into a class object.Third, ClassLoader hierarchy structurePlease perform the following procedure:1 pu
It is good to understand the Java class loading mechanism when doing Java development. The basic understanding of the class loading mechanism is also helpful for Java developers handling exceptions related to the ClassLoader (ClassLoader).class Loader delegation mechanismThe loading of Java classes is done through the class loader (CL), which is responsible for loading classes into the JVM. Simple applicati
, you can use three class loaders: bootstarp class loaders, extensions class loaders, and application class loaders.
Bootstrap loader: only responsible for loading the core Java library, such
Vm. jar and core. jar in the/jre/lib directory. This class loader is the core part of JVM and is written in native code.
Extension Class Loader: responsible for load
The Java class loader is a tool responsible for loading. class files to the memory. It is said that only after. Class is loaded as memory can it be called bytecode.
The Java class loader has a parent-child cascade relationship:
Bootstrap --> extclassloader --> appclassloader --> Custom Class Loader
-- Bootstrap and loader
Welcome to other blogs on this topic:
Deep Dive into Java Virtual Machine (I)-detailed explanation of the underlying structure of Java Virtual Machine
Deep Dive into Java Virtual Machine (II)-class lifecycle (I) class loading and Connection
In-depth Java Virtual Machine (III)-class lifecycle (ii) class initialization
Go deep into Java Virtual Machine (4)-garbage collection mechanism of Java Virtual Machine
In-depth explanation of Java Virtual Machine (V)-Java Local interface JNI
In-depth Java V
as:Verify the principle of the ClassLoader load class:Test 1: Print the hierarchy of the ClassLoader class, see the following code:ClassLoader loader = ClassLoaderTest.class.getClassLoader(); //获得加载ClassLoaderTest.class这个类的类加载器 while(loader != null) { System.out.println(loader); loader = loader.getParent(); //获得父类加
This is the official document, you can refer to, I write these things just to give yourself a note, also for the use of a friend reference; official documents: http://omappedia.org/wiki/Bootloader_Project
----------------------------------------------------------2012/09/14/5----------------------------------------------------------1: When a system is first booted, the CPU invokes the Reset vector to startCode at a known location in ROM;When the system starts for the first time, the Reset vector
Urlsteam supports multiple encoding methods to read text files.
If urlloader encounters garbled characters, it can be converted (as mentioned in the previous article, excle can solve the garbled problem based on the standard XML format ):
VaR BA: bytearray = new bytearray;
Ba.writebytes(event.tar get as urlloader). Data );
Ba. Position = 0;
// Assume that an XML document is recorded.
VaR XML: xml = XML (BA. readmultibyte (BA. length, "GBK "));
Loader
There are many tools to implement multi-boot, such as system commander, Lilo of Linux, and OS loader of WindowsNT. There are two principles: Modify the MBR (Master Boot Record) and use the JMP command to jump to your own code at the end of the MBR to control the guiding process; another method is to modify the Boot Code of the first sector in the primary partition to implement multiple boot operations.
Here the MBR, that is, the primary Boot Record, r
Android 3.0 provides a new concept loaders, these two days to see the source of the previous contacts, which wrote a part of the call record, found that the source of a lot of loadermanager use, now do a summary, Record the basic usage of Loadermanager:This is actually divided into two parts: Loadermanager and custom loader, such as loading contacts, text messages These systems provide contentprovider data, in fact, is to return a standard cursor, the
JAVA Class Loader section 14thToday we will load the first phase of the class loading mechanism in 5 stages, also called loading . In order to read the good distinction, the following is called loading.The first step in loading is to get a binary byte stream, which can be obtained from a read. class file, or it can receive a stream of bytes sent from someone else on the network. Anyway, you can enter this phase as long as the virtual machine's specifi
class's class to be initialized. Loading of Classeswhen starting the JVM , you can use three classloader: boot (bootstarp) class loader, extension ( Extensions) class loader, application (application) class loader. boot class Loader: only responsible for loading the core java Libraries, such as those located in
In an Oracle database, we typically use the following methods when replicating or migrating between tables in different databases:1. The record of a table is exported as a semicolon-delimited INSERT statement and then executed into table B2. Create a dblink between the databases and then use CREATE TABLE B as SELECT * from [email protected] where ..., or INSERT INTO B SELECT * FROM C1>[email protected] where ...3. Exp A, then imp to form B, exp can add query conditions4. Program implementation S
After compiling a program with VS2010 on Win7, then debug the program with the release state and output debugging information. The console window also appears, but loading related information is particularly slow. And the following information appears:win32.exe ': Loaded ' C:\Windows\System32\msvcr100d.dll ', Symbols Loaded.' win32.exe ': Loaded ' C:\Windows\System32\imm32.dll ', cannot find or open the PDB file' win32.exe ': Loaded ' C:\Windows\Syste
ClassLoader. The DefineClass method is then used to load the class from a binary stream. However, this is not feasible in Android,Two Android class loadersAndroid class loader mainly has two pathclassloader and Dexclassloader, where Pathclassloader is the default class loader , let's say the difference between the two and contact.
Pathclassloader: Support for loading Dex or an already installed ap
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