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- java array one-dimensional array
- This article is recommended by the Java introductory learning column and introduces some relevant knowledge about one-dimensional arrays in detail. Java performs out-of-bounds checks on array elements to ensure safety. If the array element subscript is less than 0, greater than or equal to the array length, an exception will be generated.
- JavaBase 2051 2019-11-28 14:36:04
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- Determine whether a folder exists in java, create it if it does not exist
- In "java", the method to determine whether a folder exists or create it if it does not exist is: first save the folder path that needs to be determined into an object, and then call the "exists" and "isDirectory" methods to determine whether it is a folder and whether it exists. , if it is not a folder or does not exist, call the "mkdir" method to create the folder.
- JavaBase 2709 2019-11-28 11:50:39
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- Garbled characters appear when reading text files in java
- The reason for garbled characters when reading text files in "java" is: "java" uses the default character set in the local environment when reading the data stream. The solution is: when "java" reads the data stream, it must specify the encoding method of the data stream, for example: "UTF-8".
- JavaBase 1856 2019-11-28 11:18:59
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- Detailed graphic and text explanation of garbled file reading problem in Java
- When Java reads a file, if you do not specify the encoding format, it will use the default character set in the local environment. When the text encoding format is different from the local one, garbled characters will appear. We can specify the encoding format when reading the file to avoid garbled characters.
- JavaBase 2132 2019-12-07 15:15:53
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- How to solve the problem of garbled characters when uploading web projects in Java
- The way to solve the problem of garbled characters when uploading "web" projects in "java" is: it can be solved by "Filter". First define a class to implement "Filter" and declare a "doFilter" method in the class, and then in this method Just set the requested character set and release the request to the destination address.
- JavaBase 2858 2019-11-28 11:00:46
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- Solution to garbled code when java inserts data into mysql
- The solution to the garbled code when java inserts data into mysql: Just add the encoding format when connecting to the mysql database in java. When connecting to the database, add "?characterEncoding=UTF-8" after the database name to add the encoding format.
- JavaBase 2178 2019-12-07 15:14:43
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- Implementation in java to determine whether a file exists and create it if it does not exist
- The way to determine whether a file exists in "java" and create it if it does not exist is: first define an object to save the file path that needs to be determined, then call the "exists" method combined with the "if" loop to make a preliminary determination, and then use exceptions If the implementation file does not exist, just create it.
- JavaBase 3264 2019-11-28 10:47:47
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- Two ways to get the day of the week of a date in java
- How to get the day of the week of a date in Java: 1. Use the Calendar class to get the day of the week. Note that the week obtained by this method starts on Sunday. 2. Use the SimpleDateFormat class to get the day of the week, and use the parameter "EEEE" to get it.
- JavaBase 6003 2019-12-07 15:13:53
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- Detailed explanation of the method to determine whether it is a leap year in Java
- How to determine whether it is a leap year in Java: Use the if statement in Java code to determine whether it is a leap year by determining whether the year is divisible by 4, not divisible by 100, or divisible by 400.
- JavaBase 11740 2019-12-07 15:12:38
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- Detailed explanation of the causes and solutions of garbled characters in Java
- The reason for garbled characters: It is caused by the inconsistency between the original encoding format of the string and the encoding format used for parsing when reading. Solution: Just change the encoding format of the garbled text in the java code.
- JavaBase 12626 2019-12-07 15:08:13
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- How to determine whether a string is an int in java
- The method of judging whether a string is "int" in "java" is: first judge the length of the string that needs to be judged. If the length of the string is not 0, then use the "charAt" method to judge whether the specified index character in the string is "int", finally use loop judgment.
- JavaBase 5407 2019-11-28 09:59:12
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- java error: symbol not found
- The "symbol not found" error reported in Java is generally because the corresponding class is not introduced in the code. This article takes the Arrays method as an example to introduce the reasons and solutions for the error "symbol not found" when the Arrays class is not introduced.
- JavaBase 29952 2019-11-28 09:57:06
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- Java error: Reasons and solutions for main class not found or unable to be loaded
- Reason for the error: This problem often occurs because the java source file contains the package name. Solution: 1. Delete the package name from the source file (not recommended). 2. Create a file path structure under code that is the same as the package name.
- JavaBase 64006 2019-11-28 09:45:01
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- How to determine whether a string consists of characters in java
- The method to determine whether a string is composed of characters in "java" is: first define a regular expression for determination, for example: "^[a-zA-Z]*", and then by calling the "matches" method, you will need Just match the determined string with the defined regular expression.
- JavaBase 2460 2019-11-28 09:44:41
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- Java custom error page implementation method
- How to specify an error page in java: customize the error page and call the customized page in web.xml. When the service throws a 404 or 500 exception, the servlet service will look in web.xml to find out whether error-page and error-code are set to call a custom error page.
- JavaBase 2630 2019-11-28 09:35:26
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