current location：Home > Technical Articles > Java > JavaBase
- Direction：
- All web3.0 Backend Development Web Front-end Database Operation and Maintenance Development Tools PHP Framework Daily Programming WeChat Applet Common Problem Other Tech CMS Tutorial Java System Tutorial Computer Tutorials Hardware Tutorial Mobile Tutorial Software Tutorial Mobile Game Tutorial
- Classify：
-
- What are the stages of jvm class loading process?
- Class loading process: 1. Loading phase; 2. Verification phase; 3. Preparation phase, which mainly allocates memory and initializes class variables in the method area; 4. Parsing phase; 5. Initialization phase, the compiler will The declared static assignment variable and the static area are merged to generate the cinit method and called; 6. Use phase; 7. Uninstall phase.
- JavaBase 13742 2023-01-13 00:40:03
-
- What file is r.java?
- The R.java file is automatically generated by the compiler and does not require developers to maintain it. R.java will automatically include all resources in the current application and create corresponding IDs based on these resources. R.java can be simply understood as the resource dictionary of the current Android application.
- JavaBase 5096 2023-01-13 00:40:02
-
- How to write constructor method in java
- The constructor method in Java is written as "class class_name {public class_name(){} public ciass_name([paramList]){} ...//class body}". The method name must be the same as the class name, and the respective method parameters must be different.
- JavaBase 19423 2023-01-13 00:40:02
-
- What are the java containers?
- java container：ArrayList、LinkedList、Vector、HashSet、LinkedHashSet、TreeSet、LinkedHashMap、TreeMap、ConcurrentHashMap、Hashtable etc.
- JavaBase 25975 2023-01-13 00:40:02
-
- What are the built-in objects of jsp?
- The built-in objects are: 1. Request object; 2. Response object; 3. out object; 4. session object; 5. application object; 6. PageContext object; 7. Config object; 8. Page object; 9. Exception object.
- JavaBase 19281 2023-01-13 00:40:02
-
- What is the extension of java source file?
- The extension of the java source file is ".java"; compile it with javac to generate a bytecode file with the suffix ".class" and save it in the same directory as the source program. If there are errors in the source code, they will be pointed out line by line. Error, correct the error and recompile until the ".class" bytecode file is generated.
- JavaBase 49604 2023-01-13 00:40:02
-
- Is Java easy to learn? How long does it usually take to learn and train?
- Generally speaking, Java training lasts for 3-6 months. People with some basic knowledge can quickly learn to master Java, which takes about 1-2 months.
- JavaBase 7559 2021-07-07 09:03:31
-
- What are the eight basic data types?
- The eight basic data types are: 1. 4 integer types (byte, short, int, long); 2. 2 floating point types (float, double); 3. 1 character type "char"; 4. 1 A Boolean type "boolean".
- JavaBase 107752 2023-01-13 00:40:02
-
- How to call webservice interface
- Calling method: First select the "Project" tab, right-click the mouse, select "new"-"other" in the pop-up right-click menu, then find "web service client", click "next", and enter the interface in "wsdl url" address, and finally click "next" to generate the class file.
- JavaBase 19961 2021-06-30 13:44:54
-
- What are the causes and solutions of stack overflow?
- Cause: The total capacity of the created objects exceeds the maximum capacity of the heap. Solution: If it is a memory leak, find the specific leak location according to the reference chain of the object that caused the overflow, and modify it; if it is a memory overflow, check the heap parameter settings of the JVM to check whether the life cycle of some objects is too long or the storage is too long. Issues such as unreasonable design will be corrected.
- JavaBase 16469 2023-01-13 00:40:01
-
- What are the three major characteristics of java object-oriented
- The three major characteristics of object-oriented Java: 1. Encapsulation, which aims to enhance data security and simplify programming; 2. Inheritance, which refers to extracting multiple identical properties and methods and creating a new parent class for the purpose of code reuse ; 3. Polymorphism, the purpose is to increase the flexibility of the code.
- JavaBase 6371 2021-06-24 13:40:34
-
- How to retain two decimal places in java
- Method: 1. Use the format method, the syntax is "String.format("%.2f", value)"; 2. Use the format method of DecimalFormat; 3. Use the setScale method for rounding; 4. Use the setMaximumFractionDigits method.
- JavaBase 64609 2023-01-13 00:40:01
-
- What is the difference between java and html
- Differences: 1. HTML is the main front-end, presenting data, and Java is the main processing data. 2. JAVA is mainly used for the development of desktop applications and distributed network applications; HTML is used for the development of front-end pages. 3. The running environment of JAVA is JDK and WEB server, and the running environment of HTML is the browser.
- JavaBase 7855 2021-06-21 15:47:45
-
- What to do if the main class cannot be found or loaded
- Solution: 1. The classpath path is configured incorrectly, causing the class file to fail to load. You can reconfigure the classpath path; 2. The test code used is not under the same package, so you can put the code under the same package.
- JavaBase 9035 2021-06-21 10:41:57
-
- How to understand the springboot framework
- 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 an ad hoc approach to configuration, eliminating the need for developers to define boilerplate configurations.
- JavaBase 7349 2023-01-13 00:40:01
Recommended Articles
Tool Recommendations
jQuery enterprise message form contact code
jQuery enterprise message form contact code is a simple and practical enterprise message form and contact us introduction page code.
form button
2024-02-29
HTML5 MP3 music box playback effects
HTML5 MP3 music box playback special effect is an mp3 music player based on HTML5 css3 to create cute music box emoticons and click the switch button.
Player special effects
2024-02-29
HTML5 cool particle animation navigation menu special effects
HTML5 cool particle animation navigation menu special effect is a special effect that changes color when the navigation menu is hovered by the mouse.
Menu navigation
2024-02-29
jQuery visual form drag and drop editing code
jQuery visual form drag and drop editing code is a visual form based on jQuery and bootstrap framework.
form button
2024-02-29
Organic fruit and vegetable supplier web template Bootstrap5
An organic fruit and vegetable supplier web template-Bootstrap5
Bootstrap template
2023-02-03
Bootstrap3 multifunctional data information background management responsive web page template-Novus
Bootstrap3 multifunctional data information background management responsive web page template-Novus
backend template
2023-02-02
Real estate resource service platform web page template Bootstrap5
Real estate resource service platform web page template Bootstrap5
Bootstrap template
2023-02-02
Simple resume information web template Bootstrap4
Simple resume information web template Bootstrap4
Bootstrap template
2023-02-02
Cute summer elements vector material (EPS PNG)
This is a cute summer element vector material, including the sun, sun hat, coconut tree, bikini, airplane, watermelon, ice cream, ice cream, cold drink, swimming ring, flip-flops, pineapple, conch, shell, starfish, crab, Lemons, sunscreen, sunglasses, etc., the materials are provided in EPS and PNG formats, including JPG previews.
PNG material
2024-05-09
Four red 2023 graduation badges vector material (AI EPS PNG)
This is a red 2023 graduation badge vector material, four in total, available in AI, EPS and PNG formats, including JPG preview.
PNG material
2024-02-29
Singing bird and cart filled with flowers design spring banner vector material (AI EPS)
This is a spring banner vector material designed with singing birds and a cart full of flowers. It is available in AI and EPS formats, including JPG preview.
banner picture
2024-02-29
Golden graduation cap vector material (EPS PNG)
This is a golden graduation cap vector material, available in EPS and PNG formats, including JPG preview.
PNG material
2024-02-27
Home Decor Cleaning and Repair Service Company Website Template
Home Decoration Cleaning and Maintenance Service Company Website Template is a website template download suitable for promotional websites that provide home decoration, cleaning, maintenance and other service organizations. Tip: This template calls the Google font library, and the page may open slowly.
Front-end template
2024-05-09
Fresh color personal resume guide page template
Fresh color matching personal job application resume guide page template is a personal job search resume work display guide page web template download suitable for fresh color matching style. Tip: This template calls the Google font library, and the page may open slowly.
Front-end template
2024-02-29
Designer Creative Job Resume Web Template
Designer Creative Job Resume Web Template is a downloadable web template for personal job resume display suitable for various designer positions. Tip: This template calls the Google font library, and the page may open slowly.
Front-end template
2024-02-28
Modern engineering construction company website template
The modern engineering and construction company website template is a downloadable website template suitable for promotion of the engineering and construction service industry. Tip: This template calls the Google font library, and the page may open slowly.
Front-end template
2024-02-28
