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- How to instantiate in java?
- Using an already defined class in Java, the process of creating an object of this class is called "instantiation". Method of instantiation: 1. Create an object using the new() method of the class to implement instantiation. 2. Use the clone method to create an object. 3. Use the Class.forName method to obtain the class, and then call the newinstance() method of the class.
- JavaBase 3125 2019-12-03 14:04:47
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- Introduction to the method of judging whether it is English in java
- How to determine whether a string is in English in java: 1. In java, you can use the regular expression "[a-zA-Z]+" to determine whether a string is all in English. 2. Use the regular expression ".*[a-zA-z].*" to determine whether the string contains English.
- JavaBase 7659 2019-12-03 13:52:34
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- How to copy files in java?
- How to copy files in java: 1. Use FileStreams to copy, use FileInputStream to read the bytes of file A, and use FileOutputStream to write to file B. 2. Use FileChannel to copy. 3. Use Commons IO replication.
- JavaBase 8829 2019-12-03 13:35:39
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- How to determine whether a character is a number in java
- How to determine whether a character is a number in java: 1. Use Character.isDigit(char) to determine. 2. Force the characters to be converted into numbers. If the input character is a number, it will return true. If an exception is thrown, it will return false. 3. Use regular expressions to judge.
- JavaBase 14941 2019-12-03 13:18:21
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- What is java map?
- Map in Java is an interface. It does not inherit any other interface. Map provides a storage collection of dual-column mappings, which can provide one-to-one data processing capabilities. The first column in the dual columns is called key. , the second column is value.
- JavaBase 4569 2019-12-03 11:56:09
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- Java method to determine whether it is a prime number (prime number)
- How to determine whether it is a prime number (prime number) in java: first use the if(src%2==0) statement to determine whether it is an even number. If it is not an even number, use the for(int i=3;i<=sqrt;i+=2) statement Use the src%i statement to judge. If it cannot be divided evenly, it is a prime number.
- JavaBase 9953 2019-12-03 11:35:24
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- Solution to garbled characters in java when running cmd
- Solution to garbled characters in java when running cmd: 1. Use the -encoding parameter to specify the encoding method when using the command in cmd to run the java file. 2. Add the "AVA_TOOL_OPTIONS" variable to the system variables of the environment variables and set the encoding format.
- JavaBase 10508 2019-12-03 11:19:23
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- Introduction to solutions to garbled file names in Java downloads
- Solution to garbled java download file name: 1. Use the URLEncoder.encode() method to UTF8 encode the filename, and the file name will be converted to Unicode encoding. 2. Convert the file name to ISO8859-1 encoding through the byte conversion method.
- JavaBase 1933 2019-12-03 10:53:54
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- Introduction to rsa garbled characters in java
- When using rsa for encryption and decryption in Java without encoding, the problem of Chinese garbled characters will occur. Solution: When using rsa encryption or decryption, use the String.getBytes() method to transcode the encrypted or decrypted content.
- JavaBase 3039 2019-12-03 10:43:25
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- Solution to garbled url in java
- Solution to garbled URLs in Java: Use the encode() or encodeURI() method to convert Chinese characters into hexadecimal characters before passing parameters. After receiving the parameters, use the decode() method to convert hexadecimal characters into Chinese to solve the URL garbled problem.
- JavaBase 2533 2019-12-03 10:29:28
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- What is file in java?
- File in java is a file class that can be used to add, delete, and search for certain types of files or folders. At the same time, it can be comprehensively utilized according to the characteristics of its member variables to avoid errors across systems, and it is best to enter when searching. Absolute path to avoid non-existent files.
- JavaBase 3815 2019-12-03 10:16:49
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- Reasons and solutions for 400 errors reported in Java projects
- Reasons why Java projects report 400 errors: 1. The field names or types submitted in the front end are inconsistent with those in the backend, resulting in 400 errors. 2. The front end did not convert the submitted object into a string. Solution: 1. Ensure that the field name types are consistent. 2. Convert the object passed by the front end into a string.
- JavaBase 11906 2019-12-03 10:08:40
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- Detailed explanation of the method of judging whether it is a number in java
- How to determine whether it is a number in Java: 1. First define the regular expression "[0-9]*", and then use the matcher() method to match the regular expression to determine whether it is a number. 2. Use the isDigit() function to determine. 3. Determine whether a character is a digit or not by its ASCII code value.
- JavaBase 4811 2019-12-03 09:54:13
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- How to export Excel from Java
- How to export Excel in Java: You can use the Jakarta POI HSSF API component in java to implement Excel export. 1. Use HSSWorkbook to create Excel file objects and sheet objects. 2. Return the row object and get the cell object. 3. Use cell objects to read and write.
- JavaBase 4290 2019-12-03 09:44:27
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- How to get input in java?
- Methods to obtain input in java: 1. Use the System.in.read() method to obtain the input characters from the console. 2. Use the BufferedReader class and the InputStreamReader class to get the input string from the console. 3. Use the Scanner class to obtain input.
- JavaBase 8633 2019-12-03 09:21:34
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