Starting with JDK1.5, Java has added support for metadata (MetaData), which is annotation (note), which differs from the single-line comment and text annotation in a Java program and has a certain connection. In fact, the annotation we're talking about now is a special tag in the code that can be read at compile, class load, run time, and do the appropriate processing. through annotation, the program developer can embed some supplemental information i
My company's collection process:
Company A buys things from our company. Company A is a borrower. For our company, the charge is an account receivable. My company opened a debit note to Company A. [This is a reminder to pay for Company A. It can be understood as a reminder]. After receiving the debit note, Company A can issue a credit note and return it to our c
Mysql study Note 3 (INDEX), mysql study note IndexIndex
Database Object Index: A combination of data. By indexing objects, you can quickly query specific records in the database object table. It is the most common way to improve performance.
An index contains one or more columns in the table in a certain order.
Index operation:
Create, modify, and delete indexes.
The database object index
Virtual serial port-note, serial port-Note
Virtual serial port is occupied, software available Serial Port Limited COM1-COM4, how to release and delete the occupied serial port
A: You can delete A numeric entry in the Registry to clear these configurations: Enter regedit in the "run" dialog box to enter the registry; then go to HKEY_LOCAL_MACHINE \ SYSTEM \ CurrentControlSet \ Control \ COM Name Arbiter. T
Hp-ux cluster, Memory note, hp-ux note
----- View hp Cluster status information
# Cmviewcl-v
CLUSTER STATUSDbsvr upNODE STATUS STATEDb01 up runningCluster_Lock_LVM:VOLUME_GROUP PHYSICAL_VOLUME STATUS/Dev/vglock/dev/dsk/c6t0d1 upNetwork_Parameters:INTERFACE STATUS PATH NAMEPRIMARY up 0/0/6/1/0 lan3PRIMARY up 0/0/12/1/0 lan4STANDBY up 0/0/14/1/0 lan5
Package status state AUTO_RUN NODEPkg1 up running enabled d
Refactoring note-the bad taste of the Code (on), restructuring the taste of the note code
This article is in the study of the summary, welcome to reprint but please note the Source: http://blog.csdn.net/pistolove/article/details/42041757
In the refactoring entry, I briefly introduced the definition, why, and when to refactor the refactoring. I think you have a g
Java self-study note (first day) install Java8 --- configure the runtime environment --- compile the "hello world" program --- Note, java8 --- hello
(1) What are jvm, jre, and jdk:
Jvm: Java Virtual Machine (Java Virtual Machine)
Jre: java runtime environment, which is the runtime environment of java programs.
Jdk: JDK (Java Development Kit) is a Java software Development Kit.
Jdk contains jre, and jre cont
Python learning Note 4-dictionary and collection, and python learning note dictionary
The dictionary is the only ing type in Python. The so-called ing refers to the sequence of the Data Type that contains the hash value (key) and the corresponding value (value. The dictionary is of a variable type. The data in the dictionary is unordered.
4.1.1 create and assign values to dictionaries
dict1={}dict2={'name':
Python study Note 5: module and package, python study note ModuleI. import modules using import
Cal. py:
#! /Usr/bin/pythondef add (x, y): return x + yif _ name _ = '_ main _': print add (1, 2)
Note: __name _ is a built-in variable. If the call value in CLI is _ mail __, otherwise it is a file name.
Import in new. py:
Import calprint cal. add (2, 3 );Ii. Pac
Note: Write and output the Java program. Note the java program output.
Create a file named demo. java
// Write the framework File
Public class Demo {
// Write the entry file
Public static void main (String [] args ){
System. out. print ("In fact, in this world, nothing can be successful as long as you work hard. After all, there are a lot of people who work hard. in a big city, the only thing that is
Result Learning Note (ii)-dynamic result set Dynamic Results Be sure not to forget to set the set get method for the saved value of the dynamic resultFirst part: Code//frontend //web.xml Class Pack Package Com.struts2.user.action;import Com.opensymphony.xwork2.actionsupport;public class Useraction extends actionsupport {private int type;private string R;public string Getr () {return r;} public void Setr (String r) {THIS.R = R;} public int GetType () {
variable use NOTE 2: #include/*1. The scope of the variable begins with the line of code that defines the variable and ends at the end of the code block 2. The function of code blocks to reclaim variables that are no longer in use, in order to improve performance*/intTest () {intv =Ten; return 0;}intMain () {{DoubleHeight =1.55; Height= height +1;//1.55+1printf"height=%f\n", height); //output value: 2.5500000 } intScore = -; { intScore =
1. When you add a password to your notes, just enter it in the "app" of your phone and then make the relevant settings.2. Then find "S note" in the application (this is Samsung's Notes feature software).3. Here you will see a lot of previous notes we have written, such as I want to add "bear" password, I will select it and then click on the upper right corner of the "pinion" icon.4. In this will pop up a layer, we can take
[Note] database basics 03, note database 03Basic SQL database syntax
Basic statement usage and database basics.Unoin usage
Each result set must have the same number of columns and have the same type.
Eg:
Select Name from Student
Union
Select Age from Student
A data type is a type of data attribute, indicating the type of information represented by the data. Any computer language defines its own dat
Bootstrap basic learning note (3) grid introduction, bootstrap note
Grid System:The implementation principle of the grid system is very simple. It only defines the container size and splits 12 parts equally (24 or 32 parts equally, but 12 parts are the most common ), then adjust the internal and external margins, and finally combine the media query to create a powerful responsive grid system. In the Bootstr
Android note R file, android note FileReading directory
Introduction to the content of the R File
Introduction to resource reference through R files
I. Content of the R File
In Android Studio, the R file is located in app-> build-> generated-> source-> r-> debug-> package name-> R
Notes:
The essence of the R file is a java file, which is R. java
This file is actually a public final class R {} class,
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