current location：Home > Technical Articles > Java > JavaBase
- Direction：
- All web3.0 Backend Development Web Front-end Database Operation and Maintenance Development Tools PHP Framework Common Problem Other Tech CMS Tutorial Java System Tutorial Computer Tutorials Hardware Tutorial Mobile Tutorial Software Tutorial Mobile Game Tutorial
- Classify：
-
- What are the common methods of list collection in Java?
- Commonly used methods for list collections in Java are: 1. "add(int index, E element)", insert an element at the specified position, and all subsequent elements will be moved back one element; 2. "get(int index)", return the list The element at the specified index in the collection.
- JavaBase 5342 2019-11-18 14:00:13
-
- What should I do if gbk's unmappable characters appear in Java?
- The solution to the unmappable character of gbk in Java: first use notepad++ software to open the source file; then copy all the code to the clipboard; then delete all the code and set the file encoding format to ANSI; finally paste the code and save it.
- JavaBase 6471 2019-11-18 13:51:22
-
- The difference between long and Long in java
- The difference between long and Long in Java is: 1. Long is the basic data type in Java, and Long is the object type in Java; 2. For Long type data, the data is an object, and for long type data, the Data is a basic data type and does not belong to objects.
- JavaBase 6370 2019-11-18 13:39:58
-
- What does java if(x) mean?
- The meaning of java if(x) is that when the value of variable x is not empty, not 0, not false, not null, the following content will be executed.
- JavaBase 5719 2019-11-18 13:38:40
-
- Java determines whether list contains a certain value
- Java method to determine whether a list contains a certain value: You can use the "contains(Object o)" method, which is used to determine whether the list contains a specified element. If the list contains the specified element, it returns true, otherwise it returns false. .
- JavaBase 11356 2019-11-18 13:26:32
-
- What is the length of java int?
- java int is 4 bytes, 32 bits, and the value range is -2^31—2^31-1, that is, the length is -2147483648—2147483647.
- JavaBase 5997 2019-11-18 13:24:56
-
- The difference between list and arraylist in java
- The difference between List and ArrayList in Java is: List is an interface, and ArrayList is an implementation class of the List interface. The ArrayList class inherits and implements the List interface.
- JavaBase 2415 2019-11-18 13:17:23
-
- where is java jdk
- Java jdk is installed in the C:\Program Files\Java\ directory by default. You can open cmd and enter "java -version" to view the specific path; on Linux systems, you can use the which java command to view it.
- JavaBase 7588 2019-11-18 13:08:33
-
- Is the key sorting of java map?
- The keys of HashMap and HashTable in java map are not sorted, and the data is fetched randomly; the keys of LinkedHashMap and TreeMap are sorted, and the output is in the order of storage and ascending order during traversal.
- JavaBase 2192 2019-11-18 11:46:46
-
- What does the import keyword mean in java
- The import keyword in java is used to import packages. If a class is used in a class from another package, it needs to be introduced using the import keyword, for example: "java.util.*", which means to import all classes or interfaces under the util package.
- JavaBase 9986 2019-11-18 11:38:02
-
- The difference between java map and list
- The differences between java map and list are: 1. Map is a collection that maps key objects and value objects, and elements cannot be repeated; 2. List stores objects in a linear manner, and elements can be repeated; 3. List uses the add method to add elements ;4. Map uses the put method to add elements, and so on.
- JavaBase 5404 2019-11-18 11:24:14
-
- How to get out of for loop in java
- The method for Java to jump out of a for loop is: if it is a single-layer loop, use break to jump out normally; if it is a multi-layer loop, you can give the for loop a name. The naming rule is name + half-width colon, and then use break followed by the name. You can jump out of the for loop.
- JavaBase 4192 2019-11-18 11:14:58
-
- java socket garbled code
- The solution to Java socket garbled code: first use InputStreamReader on the server to specify the client's input stream as utf-8 encoding, and use OutputStreamWriter to specify the output stream as utf-8 encoding; then set the same utf-8 encoding on the client.
- JavaBase 11220 2019-11-18 11:05:34
-
- What does '...' mean in java
- The symbol "..." in Java represents a variable-length parameter, which means that any number of parameters of this type can be passed in at this position. For example, if used in a formal parameter, it means that the number of parameters passed in is variable. The parameters passed in are put into an array.
- JavaBase 15353 2019-11-18 11:00:08
-
- How to write java sql statement
- How to write a java sql statement: first write the sql statement prototype; then change the required value to double single quotes; then add double quotes between the single quotes; then add two + signs between the double quotes; finally Just write the variable in the plus sign.
- JavaBase 8631 2019-11-18 10:51:07
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
