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Javagetting Started

Is jsp front-end or back-end?

jsp belongs to the backend. The essence of jsp is a servlet, and servlet is a server-side java application, so jsp is a back-end technology. JSP is deployed on the web server and can respond to requests sent by the client and dynamically generate web pages of HTML, XML or other format documents based on the request content, and then return them to the requester. JSP technology uses Java as a scripting language to provide services for user HTTP requests, and can handle complex business requirements together with other Java programs on the server.

Jan 28, 2023 pm 06:23 PM

java jsp

What is a servlet

The full name of Servlet is "Java Servlet", which means small service program or service connector in Chinese. It is a program running on a Web server or application server. It serves as a request from a Web browser or other HTTP client and a database on the HTTP server or The middle layer between applications. Servlet has the characteristics of being independent of platform and protocol. Its main function is to browse and generate data interactively and generate dynamic Web content.

Jan 28, 2023 am 09:51 AM

java servlet

What are the three forms of java comments?

Three forms of java comments: 1. Single-line comments, marked with double slashes "//", can only comment on one line of content, and are used in places where the comment information content is small. The syntax is "//comment content". 2. Multi-line comments, included between "/*" and "*/", can comment on many lines of content, the syntax is "/*comment content*/". 3. Document comments, included between "/**" and "*/", can also comment on multiple lines of content. They are generally used on classes, methods and variables to describe their functions. The syntax is "/** comment content. */".

Jan 05, 2023 pm 02:50 PM

java Comment

What can be the modifiers of java interface

The modifiers of java interface can be abstract and final. The interface can be understood as a special class. The difference is that the members of the interface have no execution body and are composed of global constants and public abstract methods; the methods of the interface are public abstract by default; and variables cannot be defined in the interface. Constants can be defined (with final modification, they will become constants), so the properties of the interface are public static final constants by default and must be assigned an initial value.

Jan 04, 2023 pm 01:04 PM

java

What is the difference between pass by value and pass by reference in java

Differences: 1. Value transfer creates a copy, while reference transfer does not create a copy; 2. In value transfer, the original object cannot be changed in the function, but in reference transfer, the original object can be changed in the function. Passing by value means that a copy of the actual parameters is passed to the function when calling the function, so that if the parameters are modified in the function, the actual parameters will not be affected; passing by reference means that the actual parameters are copied when calling the function. The address is passed directly to the function, so modifications to the parameters in the function will affect the actual parameters.

Jan 04, 2023 am 11:50 AM

java

Is java development front-end or back-end?

Java development is a back-end, not a front-end; Java is an object-oriented programming language and one of the most common back-end development languages. The back-end mainly allows servers, applications, and databases to interact with each other. You need to consider how to implement functions. Data access, platform stability and performance, etc. Commonly used scripting languages ??include php, java, python, etc.

Sep 14, 2022 pm 02:51 PM

java

How long does it take to get started with java? How long does it take to study by yourself?

How long does it take to get started with java? How long does it take to get started with PHP? Which one is better, php or java? Do many friends have such questions? Today, as the title says, we will mainly talk about how long does it take to get started with Java? It takes about half a year or a year for you to get started with Java.

Feb 14, 2022 pm 03:54 PM

Getting started with java

What is the character code set used by the java language?

The character code set used by the Java language is Unicode. Unicode is a character encoding scheme developed by an international organization that can accommodate all texts and symbols in the world.

Jan 06, 2022 pm 05:34 PM

java

Use of white-box testing framework (JUnit)

Today we will introduce junit5. junit5 consists of three different sub-project modules, including Junit Platform, Junit Jupiter and Junit Vintage.

Nov 29, 2021 am 09:33 AM

junit

How to set java variables (declaration)

In Java, you can set (declare) a variable by specifying the data type and identifier. The syntax is "variable type variable name;" or "variable type variable name = initial value;"; the variable type can be int, string, char, and double. wait.

Jul 27, 2021 pm 12:02 PM

java variable declaration

What are java static methods

In Java, static methods refer to member methods modified by static. A static method can be called without any instance of the class to which it belongs. Therefore, the this keyword cannot be used in a static method, and the instance variables and instance methods of the class to which it belongs cannot be directly accessed. However, the static variables of the class to which it belongs can be directly accessed. and static methods.

Jul 26, 2021 am 11:49 AM

java static method

What is the difference between javase and javaee

Difference: JavaSE refers to the Java Platform Standard Edition, which is used to develop and deploy Java applications on desktops, servers, and embedded devices and real-time environments. JavaEE refers to Java Platform Enterprise Edition, used for developing and deploying portable, robust, scalable and secure server-side Java applications.

Jul 23, 2021 pm 05:52 PM

javaee javase

How to get the string length in java

In Java, you can use the length() method of the String class to get the length of the string. The syntax format is "string name.length();"; this method can return the length of the string, and the length of the empty string returns 0.

Jul 13, 2021 pm 02:25 PM

java string length

What are the shortcut keys for idea?

The idea shortcut keys are: Ctrl+F, Ctrl+R, Ctrl+Z, Ctrl+Y, Ctrl+X, Ctrl+C, Ctrl+D, Alt+`, Alt+Q, Alt+F1, Alt+F2, Alt+ F3, Alt+F7, Shift+F1, Shift+F2, etc.

Jun 29, 2021 pm 02:30 PM

idea shortcut keys