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- What are the eight basic data types in java
- The eight basic data types of Java are: 1. Integer type, byte, int, short, long; 2. Floating point type, float, double; 3. Boolean type, boolean; 4. Character type, char.
- JavaBase 4205 2020-07-02 15:12:27
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- What to do if a red cross appears when importing a project in eclipse
- The solution to the red cross when importing a project in eclipse: First, right-click the project name and select [Configure Build Path] in [Build Path]; then select remove in Libraries; and finally add the JRE environment.
- JavaBase 13808 2020-07-02 13:31:17
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- The use of 5 commonly used annotations in springmvc
- There are five common annotations in springmvc: 1. @RequestMapping, which is an annotation used to process request address mapping; 2. @RequestParam, which is used to map the request parameter area data to the parameters of the function processing method; 3. @PathVariable, used Yu will request variables.
- JavaBase 10896 2020-07-01 17:25:30
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- What is java a programming language for?
- Java language is an object-oriented programming language. Object-oriented is a method of understanding and abstracting the real world. It is the product of the development of computer programming technology to a certain stage. The object-oriented development model is more conducive to people's thinking, and facilitates the division of programs during the specific development process. Division of labor and cooperation among employees to improve development efficiency.
- JavaBase 14736 2020-07-01 15:34:26
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- what is springboot
- Spring Boot is a new framework provided by the Pivotal team. It is designed to simplify the initial construction and development process of new Spring applications. The framework uses a specific method for configuration, so that developers no longer need to define boilerplate configuration.
- JavaBase 5530 2020-07-01 15:56:39
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- What are the three major characteristics of the Java language?
- The three major characteristics of the Java language are: encapsulation, inheritance, and polymorphism. Encapsulation is to hide the information of a class inside the class, and does not allow external programs to directly access it. Instead, the hidden information is operated and accessed through the methods of the class; inheritance is a relationship between classes, more like subordinates in a collection. Regarding relationships; polymorphism refers to the multiple forms of objects.
- JavaBase 5808 2020-07-01 15:26:12
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- The difference between springboot and springmvc
- The difference between springboot and springmvc is that springboot is just a configuration tool, integration tool, and auxiliary tool, while springmvc is the framework and the actual code running in the project.
- JavaBase 2980 2020-07-01 15:09:36
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- What is the relationship between classes and objects
- The relationship between classes and objects is: the relationship between classes and objects is abstract and concrete. A class is a template, an abstract description of a type of thing; an object is used to represent the individual of that thing in reality. A class is an abstraction on top of an object, and an object is the concretization of the class and an instance of the class.
- JavaBase 32738 2020-07-01 13:52:24
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- What is jdbc and its function
- Java Database Connectivity, [Java Database Connectivity, JDBC for short] is an application programming interface in the Java language used to standardize how client programs access the database, providing methods such as querying and updating data in the database.
- JavaBase 11411 2020-07-01 13:16:46
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- A class can only have one object, right?
- A class can only have one object, right. A class is a user-defined data type that can be used to describe one or more variables and objects. A class is an abstract data type, an abstraction of objects; an object is an abstraction of objective things.
- JavaBase 13055 2020-07-01 10:51:06
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- What are the formats of if statements?
- The if statement has three formats, namely: 1. [if (Boolean expression) {execution statement}]; 2. [if (Boolean expression) {execution code} else {execution code}]; 3. [if (Boolean expression) {execution code}]; Expression){execution code}else if (Boolean expression){execution code}else{execution code}].
- JavaBase 23792 2020-07-01 09:52:19
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- What does dependency injection mean?
- Dependency injection means that when the program is running, if you need to call another object for assistance, you do not need to create the callee in the code, but rely on external injection. Spring's dependency injection has almost no requirements on the caller and the callee. , fully supports the management of dependency relationships between POJOs.
- JavaBase 7029 2020-06-29 15:30:00
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- Detailed explanation of Spring AOP annotations
- This article mainly introduces Spring AOP annotation cases and detailed explanations of basic principles. The article introduces it in great detail through sample code. It has certain reference learning value for everyone's study or work. Friends who need it can refer to it.
- JavaBase 3325 2020-06-28 18:00:16
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- What are the characteristics of the interface?
- The characteristics of the interface are: 1. The interface is modified with the interface keyword; 2. The interface cannot be instantiated; 3. The implementation class must implement all methods of the interface (except abstract classes); 4. The implementation class can implement multiple interfaces; 5. , the constants in the interface are static constants
- JavaBase 13479 2020-06-28 16:19:28
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- What does the interface do?
- The role of interfaces: 1. Interfaces can separate projects, and all layers are oriented to interface development, improving development efficiency; 2. Interfaces reduce the coupling between code and code; 3. Interfaces can be implemented and inherited in multiple ways, and one class In addition to interfaces, other classes can also be inherited.
- JavaBase 27449 2020-06-28 16:05:10
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