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- 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.
- JavaBase 21310 2020-11-06 12:43:25
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- 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;].
- JavaBase 4672 2020-11-02 15:36:24
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- 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);".
- JavaBase 100474 2020-11-02 15:00:33
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- 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.
- JavaBase 13165 2020-11-02 14:40:53
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- 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.
- JavaBase 5457 2020-11-02 14:23:46
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- 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.
- JavaBase 71746 2020-11-02 13:41:39
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- 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)].
- JavaBase 77055 2020-11-02 09:46:02
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- 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.
- JavaBase 11314 2020-11-01 14:54:25
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- 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.
- JavaBase 3692 2020-10-30 14:59:20
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- 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.
- JavaBase 3382 2020-10-30 14:51:07
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- 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.
- JavaBase 21895 2020-10-30 13:53:58
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- 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)].
- JavaBase 31437 2020-10-29 15:25:02
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- 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.
- JavaBase 11741 2020-10-29 14:20:21
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- What are the differences between springboot and springmvc?
- The difference between springboot and springmvc: 1. Spring MVC provides a lightly coupled way to develop web applications. It is a module of Spring and a web framework; 2. Spring Boot implements automatic configuration, reducing the complexity of project construction. Spend.
- JavaBase 88394 2020-10-29 16:20:35
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- How to intercept a string using substring in Java
- The substring method in Java to intercept a string: [public String substring(int beginIndex)] starts from the index beginIndex and ends at the end of the entire string.
- JavaBase 7337 2020-10-29 16:19:47
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