Page 12-JavaBase Programming Tutorials: Learn JavaBase Online-php.cn

Article Tags

Home

Technical Articles

Java

JavaBase

What is the difference between struts2 and springMVC?

Difference: the springmvc entrance is a servlet front-end controller, and the struts2 entrance is a filter; 2. springmvc is developed based on methods, and struts2 is developed based on classes; 3. Compared with SpringMVC, Struts2 verification is more cumbersome.

Nov 09, 2020 am 10:05 AM

struts2 springMVC

Why was jsp eliminated?

JSP was eliminated not because of backward technology, but because of industry trends; now the emphasis is on the separation of front-end and back-end. The front-end writes the front-end code, and the back-end writes the back-end code. There is no need to integrate the front-end and back-end codes. Together, so the use of jsp is limited.

Nov 06, 2020 pm 12:43 PM

jsp

What are the mysql query statements in java

MySQL query statements in Java: 1. Simple query; 2. Simple query; 3. Sorting query; 4. Group query, the code is [group by grouped field.[Having condition]]; 5. Paging query, the code is [ select * from table name limit x;].

Nov 02, 2020 pm 03:36 PM

java mysql查询语句

How to convert list to array in java?

How to convert a list collection into an array in Java: 1. Use the parameterless toArray method, the syntax format "Object[] toArray();"; 2. Use the toArray method that supports generics, the syntax format "<T> T[] toArray (T[] a);".

Nov 02, 2020 pm 03:00 PM

java list 数组

What does a java source file consist of?

Java source files are composed of three parts: the first part is the class or external structure, such as "class Student{}"; the second part is the main() method, also called the entry of the program; the third part is the written code, It is written in the main method.

Nov 02, 2020 pm 02:40 PM

java 源文件

What are the three factory patterns in java?

Java's three factory patterns: 1. Simple factory pattern, which provides a function to create object instances without caring about its specific implementation; 2. Factory method pattern; 3. Abstract factory pattern, which provides a function to create a series of related or interdependent objects interfaces without specifying their specific classes.

Nov 02, 2020 pm 02:23 PM

java 工厂模式

What are the eight basic data types of Java?

The eight basic data types of Java are: 1. Integer type byte, short, int, long; 2. Character type char; 3. Floating point type float, double; 4. Boolean type boolean.

Nov 02, 2020 pm 01:41 PM

java 数据类型

How to convert string to number in java

Method of converting java string to number: 1. Convert to integer number [Integer.parseInt(String s)]; 2. Convert to floating point number [Float.parseFloat(String s)].

Nov 02, 2020 am 09:46 AM

java 字符串转数字

Reasons why mysql inserts data slowly

The reasons why mysql inserts data slowly: 1. The insertion efficiency is reduced due to the main code, foreign code, and index; 2. Due to the use of a for loop to continuously execute this method to insert; 3. The query results cannot be released in time.

Nov 01, 2020 pm 02:53 PM

mysql

What are the java fonts?

Java fonts include: 1. Serif is serif; 2. [Sans-serif] is sans serif; 3. Monospaced is equal width; 4. Dialog is dialog box; 5. DialogInput is dialog box input.

Oct 30, 2020 pm 02:59 PM

java 字体

What is the principle of spring aop

Spring AOP principle: 1. AOP is aspect-oriented and is a programming paradigm that provides another perspective to consider the program structure to improve object-oriented programming OOP; 2. AOP provides developers with a mechanism to describe cross-cutting concerns. and the ability to automatically weave cross-cutting concerns into object-oriented software systems.

Oct 30, 2020 pm 02:51 PM

spring aop

What are the usages of java enumeration type enum?

The usage of java enumeration type enum is: 1. Enumeration type constant; 2. Enumeration with one parameter; 3. Add new methods to the enumeration; 4. Override the enumeration method.

Oct 30, 2020 pm 01:53 PM

java 枚举类型 enum

How to use java newline character

How to use java line breaks: 1. Change one line [System.out.print("\n")]; 2. Change two lines [System.out.println("\n\n")]; 3. Change three lines Line [System.out.println("\n\n"\n)].

Oct 29, 2020 pm 03:25 PM

java 换行符

Teach you how to completely uninstall Java

Method to completely uninstall Java: first delete the previously configured environment variables; then uninstall JavaSE normally; then delete the Java-related folders in the C drive; finally delete the registry and restart the computer.

Oct 29, 2020 pm 02:20 PM

Java