pmp study notes

Java Study Notes 4 (method) and java Study Notes 4 Methods are similar to functions in c ++. The difference is that java's method definition is not limited. The definition in c ++ must be declared before the function call after the main function: Example of the rectangular area method: Public class MethodDemo {public s

Python Study Notes (10) Python set (1), python Study Notes Review Int/float/str/list/tuple/dict Integer and floating-point types are unchangeable, not sequences. The string is immutable and is a sequence. The list is variable and is a sequence. Tuples are immutable and are sequences. The dictionary is variable, but not

Hibernate Study Notes and hibernate Study Notes V. ing One-to-multiple associations 1. Unidirectional multiple-to-one (unidirectional N-1) 1) One-Way n-1 association only needs to access one end of 1 from one end of n ① Domain model: the many-to-one-way association between Order and Customer needs to define a Customer

Python Study Notes 1-basics and python Study Notes Basics 1) annotations A single line comment starts with #. For example: # The first comment Multi-line comments can contain multiple # numbers, including ''' and "", for example: # Comment on the first line # Comment on the second line ''' Comment on the third line Com

Java Study Notes 21 --- supplementary description of internal classes of members (2) (corrected), Study Notes 21 --- Fixed: the original article was a bit incorrect, mainly concerning the subclass of the member's internal classes. Due to my cognitive limitations, I think that the subclass of the internal class should a

Java Study Notes 45 (multithreading 2: security issues and solutions), java Study Notes Thread security issues and solutions: Security issues occur when multiple threads use one shared data. A classic case: Tickets are sold in cinemas, with a total of 100 seats and a maximum of 100 tickets. There are many ways to buy

Java study notes 44 (multithreading 1) and java Study Notes Concept of multithreading: omitted Multi-threaded objective: to improve efficiency Main thread: Package demo; // main thread public class Demo {public static void main (String [] args) {function (); System. out. println (1);} public static void function () {f

Java Study Notes day05 and Study Notes day05 1. Method overload A method with the same name is allowed in the same class, as long as the parameter list of the method is different. Different parameter lists: different parameter numbers, different parameter types, and different order. Public class MethodOverLoadDemo

Struts2 framework study notes 7: struts2 tag, struts2 Study Notes Three labels: 1. JSP: script. Expired to replace servlet 2. JSTL: Standard tag Library (core, format, SQL, xml). Only core libraries are eliminated. 3. Struts2 tag Library: Developed by the Struts2 Development Team, with more powerful functions Struts2

Spring Study Notes 01 and spring Study Notes 011. Spring Introduction Spring is a lightweight solution for enterprises, including: dependency injection-based core mechanism, declarative Transaction Management Based on AOP, A collection of persistence layer technologies and excellent web mvc frameworks. Composition of t

Struts2 Framework Study Notes 2: detailed configuration, struts2 Study Notes Core configuration file: Introduce other configuration files: Relative Path under src Constant Configuration: There is a default properties configuration file under the struts2 core package. When we need to modify it, Example 1: Creat

Hibernate framework Study Notes 2: Detailed description of the configuration file, hibernate Study Notes Entity class: package domain;public class Customer { private Long cust_id; private String cust_name; private String cust_source; private String cust_industry; private String cust_level; private

JAVA Study Notes (3) and java Study Notes @ SuppressWarnings ("resource") is used to suppress resource leakage warnings. For example, if I/O class is used, it is not closed.Set features:1) unordered, not random2) unique element3) No subscriptNote: Collection List Set is an interfaceNote: Because the Set does not have a

C ++ study notes 44: inheritance and derivation, study notes 44 Class combination, class inheritance Class combination (automobile, wheel, now you can combine the wheel class into the automobile class ;) Class inheritance (transportation tools and automobiles. At this time, automobiles can be derived from transportatio

Dapper Study Notes (2)-link reference, dapper Study Notes When studying the Dapper source code, we found SqlMapper In the Dapper NET45 class library. there is a blue arrow icon in front of the cs file and it is found that SqlMapper does not exist in the Dapper NET45 folder. cs file. The complete path in its file attri

Data science Study Notes 1. science Study Notes Mutiple Plots on One Graphplt.plot(x, norm.pdf(x))plt.plot(x, norm.pdf(x, 1.0, 0.2)) #1.0 = mean, 0.2 = DSplt.show() Use plt. savefig to save the image as blank: Solution: Call plt. savefig before plt. show (). Scatter Plot From pylab import randnX = randn (10000) Y = ran

Study Notes 2, struts2 Study Notes + =,-=, * =,/= Implies forced type conversion. In logical operations, the difference between and is: : No matter whether the left side is true or false, all operations are performed on the right side. : If the left side is false, the right side is not involved in the operation. If t

Python Study Notes 02 -- list and metadata, python Study Notes 02 --I. Introduction A Data Structure is a collection of data elements that are organized together in some way. Sequence is the most basic data structure in python. python contains six built-in sequences: List, tuples, strings, Unicode strings, buffer obj

Head first python cainiao Study Notes (chapter 4), python Study Notes 1, p124, error: NameError: name 'print _ lol 'is not defined To display in the file, you need to change the call of BIF print () to call the print_lol () function in the nester module in chapter 2. Therefore, you need to import the nester module. Fi

Spring boot document Study Notes day02 and Study Notes day02 1.Start to report an error. View debug $ Java-jar myproject-0.0.1-SNAPSHOT.jar-debug 2.Custom banner The banner that is printed on start up can be changed by addingbanner.txtFile to your classpath or by settingspring.banner.locationProperty to the location o