包含标签：Java 的文章
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Is there a correct way to check the existence of files / directories in Java?
Code: String dir = //Path to the directory File saveDir = new File(dir); //Here comes the existence check if(!saveDir…… -
Swing – why does eventlistenerlist traverse backwards in firefooxxx()?
I don't understand the basic principle of this code, which is taken from javax swing. event. Eventlistenerlist documen…… -
Java – mockito throws an outofmemoryerror in a simple test
I try to use mockito to simulate the database pool (only for retrieving data), but it will run out of memory when runn…… -
Java – double check locking using regular HashMap
Back to concurrency So far, it's clear that for double check locking, variables need to be declared volatile However, …… -
Java – how to prevent hibernate from refreshing in the list?
I have a simple hibernate query, such as: from MyEntity where name = ? It's not fancy, but it's called many times in a…… -
Java swing – JList custom cell rendering – capture operation
Whenever I create a custom cell renderer for JList, any elements I add to it will not respond to the operation For exa…… -
Java – regular expression patterns match all uppercase letters after colons
I need a pattern that matches words like apple: or pear: [A-Z] [:] will match R: but not the whole word, so it will gi…… -
Java gets the file extension without substring
How to get a file extension in Java without using stupid lastIndexOf ('.') and so on? Solution The Apache commons libr…… -
Java – accessing application properties in spring MVC
New features of spring MVC I think so Two properties are stored in the properties file (uploadfolder =.., downloadfold…… -
Java: what is the difference between format specifiers% X and% H?
Looking at the specification page, I see that% h calls integer Tohexstring(), but I can't find any actual difference b…… -
Java – when I need to escape an HTML string?
In my legacy project, I can see that escape html is used before sending strings to the browser StringEscapeUtils.escap…… -
Java – Jackson, serializing a referenced attribute
When serializing Java objects with other object references, I only need to serialize one attribute of the nested objec…… -
Java – get button name from actionlistener?
I have browsed the Internet, but I can't find the answer I am using the for loop to create 36 buttons called A1, A2, e…… -
Java – lwjgl cannot find the display class
I have installed lwjgl into the Java project. I can't import the display class import org.lwjgl.opengl.display; An uns…… -
Java – swing text editor, color and highlight
I am writing an application that users need to write a JavaScript script as input. Now I have a simple jtextarea, but …… -
Java – how to delete objects from the stream in the foreach method?
I have to use arrays: arra and ARRB Arra and ARRB are lists of different types of objects. The add function converts o…… -
How to create a reordering tableview in JavaFX
I have a JavaFX tableview I want to allow users to click and drag to reorder table rows I can't seem to find any way t…… -
Why does Java’s schedulewithfixeddelay use runnable instead of futuretask Packaging runnable?
Why does Java's schedulewithfixeddelay use runnable instead of futuretask to wrap runnable? It can be easily displayed…… -
Java – sort the (array) list in a specific order
I have a list of objects that I want to sort in a defined order Before sorting: After sorting: orange …… -
Tricky Java programs
Look at the following code, please help me solve this problem class TestTrick{ public static void main(String arg…… -
How to read comma separated values from text files in Java?
I have this text file, which contains the latitude and longitude values of different points on the map How do I divide…… -
How to use webdriver selenium to get the value of the “style” element
I want to check whether the value of a style element is greater than a specific value (that is, is it > 666px?), Bu…… -
Java: scheduling tasks at random intervals
I'm new to Java. I'm trying to generate a task that runs every 5 to 10 seconds, so any time interval between 5 and 10,…… -
Java – eclipse generates getters / setters for domain objects and class members with’m ‘suffixes
I have a small problem with the getter and setter methods generated in my domain object class User{ String mName; List…… -
Java – print the inversion of any string without using any predefined functions?
How to print the reverse of string Java is an object-oriented language without using any predefined functions, such as…… -
Can I write variable names with hyphens in Java?
I use gson in my application I have the following JSON responses: { "success":true,"person-name": "John" } So I'm cr…… -
java. Lang. class and equal
According to the Javadoc of the class But when I ran down there int[] intArray = { 1,2 }; out.println(intArray.getClas…… -
Java observer and observable do not work properly between applications
I have an application that contains the main JFrame of the default list model I hope that if I modify the contents of …… -
Java – mockito: how to test that a constructor is called?
I'm using mockito to test methods in Java applications How to test that the constructor is called once? I'm trying a s…… -
Java – JIT optimization and weak references
I have the following code: private final List<WeakReference<T>> slaves; public void updateOrdering() { …… -
Java – set the most important bit by bit
I want to find the most important bit set to 1 I've tried all possible ways from & oring all bits from 1 to 31, it…… -
Is java suitable for “Web 2.0” applications?
A few days ago, I chatted with someone who suggested that rails and PHP are the most suitable platforms for web applic……