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- How to determine whether a specified character exists in java
- In Java, you can use the contains method to determine whether the specified character exists. The java.lang.String.contains() method returns true if and only if this string contains the specified char value sequence.
- JavaBase 3273 2019-12-28 15:10:02
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- How java is cross-platform
- Methods for java to achieve cross-platform: 1. By specifying the value range and behavior of basic data types in the Java language. 2. Compile all java files into class files. 3. Convert the Class file into a binary file corresponding to the platform through the Java virtual machine.
- JavaBase 4946 2019-12-28 14:55:53
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- Java determines whether a string contains the specified string
- Java can use the indexOf(String s) method to determine whether a string contains the specified string. If it does, the returned value is the starting position of the substring in the parent string. If it does not contain, the entire return value must be -1. .
- JavaBase 3946 2019-12-28 14:19:14
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- How to compile java into class file
- Method to compile java into class file: 1. Open cmd and enter the bin directory of jdk installation. 2. Then find the Java file to be compiled and use the Javac command to compile the java file into a class file.
- JavaBase 8535 2019-12-28 14:03:29
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- Java determines whether a string is Chinese
- How to determine whether a string is Chinese in java: You can use "string.matches("[\u4E00-\u9FA5]+")" to determine whether a string is Chinese. "\u4E00-\u9FA5" is the Chinese Unicode encoding range.
- JavaBase 5784 2019-12-28 13:31:54
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- What is the function of java method
- A Java method is a collection of statements that together perform a function. The role of the java method: it can make the program shorter and clearer, improve the efficiency of program development, and improve the reusability of the code.
- JavaBase 4941 2019-12-28 11:16:08
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- How to write a file in java
- How to write files in java: 1. Use FileWritter to write files. The character stream writes characters to the file. By default, new content will be used to replace all existing content. 2. Use BufferedWriter to write files.
- JavaBase 7288 2019-12-28 10:57:43
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- Java determines whether the database exists
- Whether the Java database exists can be judged by using statements such as "String sql="SELECT COUNT(*) FROM information_schema.schemata WHERE schema_name=\""+database+"\""".
- JavaBase 3148 2019-12-28 10:42:46
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- How to use t in java
- <T>T in Java means that the return value is a generic type, and a single T means to limit the parameter type you pass. It is mostly used to jointly operate a class object and then obtain the collection information inside.
- JavaBase 3872 2019-12-28 10:04:46
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- How to generate exe from java program
- How to generate exe from java: 1. First package the java program into a jar file. 2. Use exe4j to generate the jar package into an exe file. First click next, then enter the Project type, select "JRA IN EXE", and then perform some configurations to generate the packaged jar file into an exe.
- JavaBase 8560 2019-12-28 09:53:02
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- Java uses regular rules to determine whether it is a number
- Java regular method to determine whether a string is a number: first define the regular expression "^-?\\d+(\\.\\d+)?$", and then use the matches() method to detect whether the string matches the given regular expression You can use the formula to determine whether it is a number.
- JavaBase 4505 2019-12-28 09:27:51
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- Java method to determine whether socket is disconnected
- How to determine whether the socket is disconnected in java: You can use the sendUrgentData method in the socket class to determine whether the SO_OOBINLINE attribute of the socket is turned on. An exception will be thrown in java.
- JavaBase 2798 2019-12-27 16:51:28
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- Solution to Chinese garbled characters in Java database
- Solution to Chinese garbled characters in Java database: Add useUnicode=true&characterEncoding=UTF-8 parameters after the URL configured in the database to solve the problem of database garbled characters.
- JavaBase 3421 2019-12-27 16:31:46
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- How to determine whether two dates are the same day in java
- How to determine whether two dates are on the same day in java: 1. Use the Calendar.YEAR and Calendar.DAY_OF_YEAR methods to determine whether two dates are on the same day in the same year. 2. Use SimpleDateFormat to format the two dates, and then use equals to judge.
- JavaBase 11406 2019-12-27 16:13:58
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- Java determines whether a date is a weekend
- Use the "get(Calendar.DAY_OF_WEEK)-1" method to obtain the number corresponding to the specified date. When the obtained number is 0 or 6, it means that the date is a weekend. In Java, you can use the Calendar.DAY_OF_WEEK method to get the number corresponding to the day of the week for a specified date, 1-7 corresponds to Sunday to Saturday.
- JavaBase 3722 2019-12-27 15:39:00
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