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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.

Dec 28, 2019 am 09:53 AM

java

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.

Dec 28, 2019 am 09:27 AM

java

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.

Dec 27, 2019 pm 04:51 PM

java socket

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.

Dec 27, 2019 pm 04:31 PM

java 数据库乱码

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.

Dec 27, 2019 pm 04:13 PM

java

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.

Dec 27, 2019 pm 03:39 PM

java

What is the difference between wait and sleep in java?

The difference between wait and sleep in Java: 1. Sleep comes from the Thread class, while wait comes from the Object class; 2. The sleep method does not release the lock, but the wait method releases the lock, allowing other threads to use synchronization control blocks or methods.

Dec 27, 2019 pm 03:14 PM

java wait sleep

Java method to determine whether string is a number

How to determine whether a string is a number in Java: Use the charAt() method in a loop to return the characters in the string one by one, and then use the isDigit() method to determine whether the specified character is a number.

Dec 27, 2019 pm 02:50 PM

java

What is the difference between html and java?

HTML and java are essentially different. Java is an object-oriented programming language, and html is hypertext markup language. It is a markup language, not a programming language, and is used in almost all web pages.

Dec 27, 2019 pm 02:44 PM

html java

How to create a folder in java

In Java, you can use the mkdir() method to create a single folder. When using this method to create a directory, you must ensure that its parent folder exists. Or use the mkdirs() method to create a multi-level directory. This method does not require ensuring that its parent folder exists.

Dec 27, 2019 pm 02:37 PM

java

Is there any difference between c syntax and java syntax?

There are differences between c syntax and java syntax, for example: 1. C language has pointers, but java does not have pointers. 2. The identifiers available in C language are numbers, uppercase and lowercase letters, and underscores, which cannot start with a number. In addition to the three types of identifiers in C, the identifiers available in Java have one more dollar sign ($), which also cannot start with a number.

Dec 27, 2019 pm 02:29 PM

c java 语法

How to get ip address in java

How to get IP in java: You can return the IP address through the HttpServletRequest object, where the getRemoteAddr method returns the IP address of the client that made the request, and the getLocalAddr method returns the IP address of the WEB server.

Dec 27, 2019 pm 02:27 PM

java

What is the difference between java collection and array?

Differences: 1. An array declares the type of elements it contains, while a collection does not. 2. Arrays are static. An array instance has a fixed size. Once created, the capacity cannot be changed. Collections can dynamically expand their capacity and change their size dynamically as needed. Collections provide more member methods to meet more needs.

Dec 27, 2019 pm 02:06 PM

java 集合数组

Solutions to garbled characters in imported java projects

Solution to garbled characters when importing java projects: 1. Right-click properties on the project, select Resource, and change Text file encoding. 2. Select Window-preferences-General-Workspace in the IDE and modify the encoding.

Dec 27, 2019 pm 01:50 PM

java 乱码