java code review

possible. To make a choice, rails should be the first in the flow of meta programming frameworks that use Ruby or other dynamic programming languages. But Java has started to introduce Ruby's features, such as Trails,groovy. 2, 2005 Java new gadgets · Drools:drools is a rete algorithm based on the Charles Forgy ' s, designed specifically for the Java language. T

Watch the video review Java for some time. Although the things I do now are net, I haven't forgotten to review Java.More probably here.Naming rules for Java variables:(A) Composition rules:1: English uppercase and lowercase letters2: Number3:$ and _(2) precautions:A: Cannot start with a numberB: cannot be a keyword in

The Sixth chapter review summarizesA week after a small holiday, the teacher did not want to catch up on the progress of the seventh chapter of the new knowledge, but the contents of the previous chapter of the system review, originally in the sixth chapter I left a relatively many problems, a lot of knowledge points are indefinitely, vague, but this week ended, I found that they have a great harvest.sortin

1Raw datatype (primitive data type) = = Base type (fundamental type)byte short int long float double char BooleanReference type Reference type2System.in System.outJava.util.ScannerScanner input = new Scanner (system.in);Nextbyte ()Nextshort ()Nextint ()Nextlong ()Nextfloat ()Nextdouble ()Next ()Nextline ()3IdentifierThe identifier must be an alphanumeric underscore and a sequence of characters, which, in practice, is used only in the source code gener

implements)There can be no final in an interface constant, and an abstract method can be without an abstract.When copying an object variable, the original variable references the same object as the copy variable. If you want to create a new copy of an object, its original state is the same as original, but you can change the state of each one later, you need to use the Clone method of the object class. The Clone () method in the object class is decorated with the protected modifier. This also m

Tags: Use strong SP file data on problem code BS Software developers generally do not consider a form of testing-manual testing. Most people think that because the program is written for machine execution, the machine should also test the program. This idea is problematic. The manual testing method is very effective in exposing errors. In fact, most software projects should use the following manual testing method: 1. Check the

in the lock flag waiting pool, and only the lock flag waits for the thread to acquire the lock flag, and notify () does not work if there are no threads in the lock flag waiting pool.Notifyall () removes all the threads waiting for that object from the object waiting pool and puts it in the lock flag waiting pool.Note that these three methods are java.lang.Object methods.5, run and start ()Put the code that needs to be processed into the run () metho

;===============================================================================================================Multi-Table query: Ways to query Multiple tables: * Cross Connection:* SELECT * from a B; ---obtained is the Cartesian product of two tables.* Inner Connection: INNER JOIN--inner can be omitted* Explicit Intra-connection: SELECT * from A inner join B on condition;* SELECT * FROM customer C INNER JOIN orders o c.cid = o.cid;* Implicit internal connection: SELECT * from a a

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created, runtime Invoke method, run-time Read and write Object properties.The reflection of the Java FoundationTuesday is the Java Dynamic Agent, the difference between static agent and dynamic agent, dynamic agent to run the dynamic generation and load class class. Dynamic proxies are essentially implemented in two ways, based on the implementation of the same interface, such as the dynamic proxy of the J

, but these are enough)II. application points (for courses)1. Whether the given string conforms to the filtering logic of the regular expression (i.e. "match");2. Use regular expressions to get the specific part you want from the string.Iii. Some simple examples (expressions)1. Match URL: [a-za-z]+://[^\s]*2.QQ (at least 5 digits, not starting with 0): [1-9][0-9]{4,}3.((HTTP|FTP|HTTPS)://) ([a-za-z0-9\._-]+\.[ a-za-z]{2,6})4. Email:^[a-zA-Z0-9_-][emailprotected][a-zA-Z0-9_-]+(\.[a-zA-Z0-9_-]+)+$

borrowing cycles1) days/days of the month (actual days, and fixed to 30 days)2) conversion based on the number of months borrowedEight refactoring as a strategy modeSpecific mode description: http://www.cnblogs.com/promise-7/archive/2012/05/29/2524357.htmlPolicy is also called policy mode "GOF95". Here is a schematic diagram of the policy pattern:This pattern involves three characters: Environment (context) Role: holds a reference to a strategy class. Abstract policy (Strategy) rol

Peer Personal Code Review resultsI. GENERAL INSPECTION1, the code can run normally, the basic can realize the predetermined function, there is no big logic error.2, the code structure is very clear, the module is done very well, very good use of object-oriented programming ideas, easy to read and understand.3, the stri

One.Review Operators:Add : ternary operator. Code:/*Three-mesh operators:Ternary operators:Structure:conditions? The result of condition establishment : The result that the condition is not established ;*/Class Demo1{public static void Main (string[] args){int a = 10;int B = 9;int c = b++>=a? a++: B+a;System.out.println (a); 10System.out.println (b); 10System.out.println (c); 20}}two. Control Statements1.1 Sequential structure ( most common ) Feature

lineFor example: Add Abc.jar to the current classpath,Set Classpath=%classpath%;c:\abc.jarJar is Java archive file, as long as the classpath contains the jar file, the Java Virtual machine can automatically extract the jar file in memory, the jar as a directory, In this jar file, look for the directory structure that corresponds to the class and package name you need.The advantages of jar: On the one hand

whether the variable points to the same reference object, and equals determines whether the variable "value" is equal. The wrapper class for the Java value type (Boolean, Byte, short, Integer, Long, Float, Double, charcater) can be judged by the = = operator. int inta = 65; float floata = 65.0f; Integer INTB = 65; Float FLOATB = 65.0f; INTA = = Floata According to the value, the result is true System.out.println ("Inta = = Floata:"

First, we will use an example to briefly review the date-and time-related classes in Java: Package day7; import java. text. simpleDateFormat; import java. util. date;/*** Date class: processing Date, time. Most of the methods in this class are out of Date. We do not recommend that you use * from JDK 1.1, use the Calend

attributes in the variable. What is the difference between the method 2?In Method 2, the parameter S is pointed to the new address, and any subsequent modifications will not affect the old address. The address space of SB corresponding to the method is not changed. This can be understood as Java passes the object reference only when the address of the object reference is copied.Class Design Tips Must ensure that the data private, that is, en

Make sure that no warning uses the Code analysis tool to remove unused using check null conditions to avoid run-time null Reference Exception naming rule consistency follows the solid principle (single duty, open closure, Liskov substitution principle, interface isolation principle , dependency inversion principle) code reusability Code Consistency

with it, we do not have to use joins to achieve the goal of this example. This is not to say that inline is useless in an object-oriented model-just not so frequently in a relational model.The results of the inline translation by the compiler are as follows:The overloaded signature for LINQ to object is as follows:As the meaning of inner and outer has just been explained, it is omitted here.When the join is not followed by a SELECT clause, the C#3 compiler introduces a transparent identifier so