JavaSE review diary: interface, javase review diary Interface
/** Interface * Reference Data Type: * class, interface, array; ** interface is a reference data type, which can be considered as a special class, it is designed to solve the problem of weak functions caused by no multi-inheritance. A class can only have one parent class, but this class can implement multiple interfaces; ** the interface can also
IOS review notes 9: ARC function, ios review notes arc1. Introduction to ARCARC is a function of the editor.It will automatically release the alloc objects.It automatically generates the release in dealloc for variables using the retain attribute;When you select the ARC function when creating a project, you cannot call it:RetainRetainCountReleaseAutorelease[Super dealloc]Second ARC judgment criteria1 criter
JavaSE review diary: polymorphism, javase review diary Polymorphism
/*** Rrys replacement principle: * where the parent class can be used, the subclass * What is polymorphism: * Reference of the parent class, prerequisite for * polymorphism of the object pointing to the subclass: * two classes with inheritance relationships * polymorphism purpose: * ☆☆☆code reuse * When is the polymorphism: * When assigning
statementsDaclarestrSQL varchar2 (100);Beginstrsql:= ' CREATE table TTT (a mumber) ';Excute immediate (strSQL);EndCursorDeclareCursor "vernier keyword" c1 is a select empno, ename,job from EMP;BeginOpen C1;Fetch C1 into emp.empno,emp.ename,emp.job;While C1%found loopDbms_output.put_line ();Fetch C1 into emp.empno,emp.ename,emp.job;End Loop;Close C1;EndTriggerTable-level triggers are executed only once when several rows are inserted at a time, and row-level triggers are executed once by insertin
Basic Review of MYSQL and JDBC (I), basic review of mysqljdbc
1. Basic Database review:
1.1 What is a database? In essence, it is a file system. You can use SQL to add, delete, modify, and view data in the database.
1.2 common databases: MYSQL is commonly used in web and small and medium-sized enterprises. It is an open-source free and small-sized database that i
Database review 8 -- concurrency, database review 8Database review CH15 concurrency 15.1 concurrency issues
The I (Isolation, independent) of the ACID nature of the transaction, and the concurrent transactions are transparent. The interspersed transactions will produce multiple data inconsistency problems (different from the Database Inconsistency State ):
Lost
UI review exercise _ Youku layout and ui review Layout
I still remember the previous week. I carefully read my own code and read the code specification. A good code habit should be added to my usual practice.
Check the UI.
I want to deliberately review the previously neglected UI knowledge today. In fact, as a developer, we need to get used to relative layout. F
Java review notes, java Review
I recently want to build two JavaWeb-based network systems. I think of my poor Java skills... Teardown! So it took three days to review the important knowledge of java, mark a note.
Directory
I. Basic Knowledge
Ii. string
Iii. Category
Iv. Management
V. Generic
6. threads
7. Reflection
I. Basic Knowledge
1. Java SE can be divided in
Basic SVG knowledge Review and basic svg knowledge Review
I started my blog for the first time. I want to review the SVG animation I learned when I made the competition last year. Next, write an animation summary for SVG production.
SVG is a language that uses XML to describe two-dimensional graphics and plotting programs..
First, let's take a look at the advanta
Review 6 sessions (December 3)2.5/2.6 module Use2.7 Object-oriented introductionProperties of Class 2.8Method of Class 2.9Built-in Methods for class 3.0Inheritance of the 3.1/3.2 classNotes:Module:Modules are the basic way to organize your code in Python.A python script can run on its own, or it can be imported into another script, which we call a module when the script is imported to run.All. py files can be imported as a moduleThe module name is the
. NET Core 2016 review,. netcore2016 Review
We are reviewing our 2016. Today, let's take a look at 2016 of. NET Core.
Every year, the pace is indeed fast. in a twinkling of an eye, it will be 2017 immediately. In the new year, we will continue with our ideals and aspirations.January
ASP. NET 5 renamed ASP. NET Core 1.0.
Root Cause of renaming: "ASP. NET 5" is an upgraded version of ASP. NET 4.6, which is mo
C ++ knowledge Review (1), knowledge Review
I feel that the World is always agreed, and the first program in every language is always Hello World! However, some books seem to be pursuing individuality and will use others, but they are Not Hello World! I need to learn more about C ++, so from the very beginning. Hello World:
1 // helloworld.cpp2 #include
This may be the simplest program, simply printing "He
JVM review notes and jvm Review
-- Take it easy
Garbage collection:
Young generation ------- serial, parnew, parallel scavengeTenured gencration --------- CMS, Serial old (MSC), parallel old.The parallel scavenge collector is a new generation collector that uses apparel algorithms and parallel multi-thread collectors.It looks like parnew. What's special?-- The characteristics of parallel scavenge collecto
Seven years later, I will review the jdk environment configuration, and I will review the jdk later.
I think I have been working for a long time, but I haven't posted any post. I 've been chatting with other people's technologies on the Internet, so I feel very ashamed. Haha! Why? In fact, I still think that the document is too poor, so I have never dared to write a pen. Later I thought that I would like t
Review of java basics-Java data types, review of java Data Types
1. java data type. 8 Basic Types and 3 reference types
Basic type (also called original type): byte, short, int, long, char, float, double, boolean
Reference Type: Class, interface, array
2. Basic java Data Types
Java has eight basic types: char, boolean, byte, short, int, long, float, and double. The numeric types include byte, short, int, lo
,Doublen2) { This. Numberone =N1; This. Numbertwo =N2; } Public DoubleNumberone {Get;Set; } Public DoubleNumbertwo {Get;Set; } Public Abstract DoubleGetResult (); } class Add:operafather {
public Add (
double N1,
double Span style= "color: #000000;" > N2):
base
(N1, N2) {
public
override
double
GetResult () {
return
this . Numberone + this
class Sub:operafather {
public Sub (
Code Review: C # common error reminders, code review
Methods shocould not be empty
Do not enter An empty method unless in this case: An abstract class may have empty methods, in order to providedefault implementations for child classes.
Source files shocould not have any duplicatedblocks
Do not duplicate code segments, lines, or strings in the source file. I don't understand.
"Switch case" clses shocould n
2017 3-4/5 two-day learning REVIEW, 2017 review
I'm going to have an interview tomorrow. I 'd like to feel it again. It's estimated that it's an abuse, blue thin ......
April March 4:Basic Computer Security Technology and principles
The password system (password) consists of five parts:
Message space (m), ciphertext space (c), key space (k), encryption algorithm (E), decryption algorithm (D)
There are two t
deletion time complexity is also O (logn).Red-black tree, another balancing algorithm for binary sorting trees.seven, multi-path search tree (b-Tree) Objective: To reduce the number of visits to external storage devices.Definition: Multiple search books, each of its nodes can have more than two children tree, and each node can store multiple elements.Block path lookup tree form:2-3 Trees2-3-4 TreeB-Tree Balanced multi-path lookup treeB + tree In order to solve the problem of all element traver
:customer Where t3:icomparable { } ? constraint type and order. Class struct interface new (); ?
Generic methodspublic void myfun{Content}?Call:myfunInferred type, if the compiler already knows the specific parameter type in the method invocation. We can omit ?
Extension methods and generic classes
Generic structure
struct Piece{ Public Piece (T data) {_data = data;} Public T _data;}
Generic delegate
Delegate R mydelegateHere the bread contains two para
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