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How to package Java

Java packaging method: 1. Use javac to generate class files; 2. Create a new file and enter Manifest and other information; 3. Put the first two files into the same folder; 4. Run "jar -cvfm main.jar manifest -C in cmd test." can be packaged.

Nov 14, 2019 pm 04:23 PM

java Pack

java prompts insufficient permissions

Solution to the problem that java prompts that the permissions are insufficient: 1. Use Xshell to connect to the server; 2. Use the command whereis java to find the java path; 3. Use the command "chmod +x java path" to add execution permissions to java.

Nov 14, 2019 pm 04:03 PM

java

java determines whether a file exists in a folder

How to determine the existence of files in a folder in java: first use the File class to create a file object; then use the file.list method to obtain the file list under the folder and store it in the filelist array; finally, obtain the array length based on filelist.length and determine if the length is greater than 0 File exists.

Nov 14, 2019 pm 03:50 PM

java folder

What are the methods in java

Java methods include: 1. General methods; 2. Construction methods; 3. Methods without parameters and return values; 4. Methods with parameters and return values; 5. Static methods; 6. Non-static methods; 7. Abstract methods, etc.

Nov 14, 2019 pm 03:28 PM

java method

How to convert string into character array in java

How to convert a string into a character array in java: Use the String.toCharArray() method to convert a string into a character array, for example "char ss[] = str.toCharArray()" to convert str into a character and save it in the ss array inside.

Nov 14, 2019 pm 03:07 PM

java string character array

How to recurse in java

Java recursion requires three conditions, 1. Boundary conditions, 2. Recursive forward section, 2. Recursive return section. When the boundary conditions are not met, the recursion advances; when the boundary conditions are met, the recursion returns.

Nov 14, 2019 pm 02:50 PM

java recursion

How to paginate in java

Java paging method: 1. Create a Page class, which stores the number of pages currently visited and the number of rows displayed on each page; 2. Calculate the required data through paging; 3. The front end uses jsp to combine the calculated data with html elements. Just show it.

Nov 14, 2019 pm 02:29 PM

java Pagination

How to update java

How to update java: First click on the Start menu - select java for all programs; then find check for update and open the java control panel; finally click [Update] - [Update Now].

Nov 14, 2019 pm 02:09 PM

java renew

How to jump out of if in java

How to break out of if in java: first add a sign here in front of the if statement, such as "here: if(...){...}"; then use the "break here;" statement inside the if to jump out of if .

Nov 14, 2019 pm 01:56 PM

java

How to write functions in java

How to write a java function: The format of defining a function is "access modifier return value function name (formal parameter) {}". For example, a function that finds the sum of two numbers can be defined as "public int sum(n1, n2) {return n1 + n2;}".

Nov 14, 2019 pm 01:38 PM

java function

What is Java interface

A Java interface is a declaration of a series of methods and a collection of method characteristics. An interface only has the characteristics of the methods but not the implementation of the methods. Therefore, these methods can be implemented by different classes in different places, and these implementations can have different behaviors ( Function).

Nov 14, 2019 pm 01:35 PM

java

How to use == in java

Usage of == in Java: 1. Use the if statement as a judgment condition, such as "if (1 == 1)"; 2. Use it in the ternary operator, such as "1 == 2? "true" : "false ";".

Nov 14, 2019 pm 01:23 PM

== java usage

java custom error exception

How to customize error exceptions in Java: 1. Define a MyException class that inherits from Exception, and pass the error to the Exception constructor through the super keyword in the constructor; 2. Throw the exception yourself through the throw keyword.

Nov 14, 2019 am 11:59 AM

java Custom exception

How to upload files in java

There are three ways to upload files in Java: upload files through streams, upload files using the file.transfer method provided by multipart, and upload files using the class method provided by spring mvc.

Nov 14, 2019 am 11:58 AM

java