包含标签：Java 的文章
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Java – how do I find a value from the HashMap closest to a specific number?
Hi, I have a HashMap < < string, double >, and a function that returns a double value called the answer I wan…… -
Java static synchronization method
What happens when two threads call static synchronization methods with different instances at the same time? Is it pos…… -
JPA – sun. After adding entitylisteners reflect. annotation. Typenotpresentexceptionproxy exception
The following crash occurred when adding entitylisteners to the application using @ entitylisteners (value = {myeventl…… -
Java – error: unable to find or load the main class test
I'm currently teaching myself ANTLR. When I finished the book "the defined ANTLR reference", I encountered a problem I…… -
Handling runtime exceptions in Java
I have the following code try{//do something } catch (Exception e) { log.error(e,e); if (e inst…… -
Java – SVN deletes files. How can I recover them?
I use eclipse and subversion in Ubuntu Linux Today, I created some new Java class files and edited the old files (thes…… -
Graphic implementation in Java
I'm trying to create a graph class that uses another class. The vertex class represents all the vertices of the graph …… -
Java – returns two different values from the method
I have a method to parse the string record list into an object and return the object list So my method signature is li…… -
Concurrency – redundancy without central control points?
If you can provide services to multiple clients, if the server providing this service fails, another server will occup…… -
Java – insert jlabel into jcombobox
http://prntscr.com/1gpdqe Sorry, this is my first time to attend this forum Can someone help me? I've been trying to J…… -
Java – why would anyone construct a while loop like this?
I'm reading a book about Java. We're reading a ByteBuffer from a channel I found the author's way to construct an odd …… -
Java – load using applet DLL and use it on the client
I can load from the server to the client in the applet, and then call the load on the client DLL (using JNI)? Solution…… -
Java monitoring: JMX and servlets
In the past few years, I have learned a lot about JMX and built some very beautiful MBeans for my web applications But…… -
Java – is there any way to know the type of object?
The scheme is that I pass an object as a parameter in the method, and I want to perform the operation according to the…… -
java – Math. Invalid cos
This point of my program should use the cosine rule to calculate bottomangle public double bottomAngle() { to…… -
Java displacement causes a negative number
I try to use displacement to convert bytes to hexadecimal (as char) equivalent However, I encountered some unexpected …… -
Java – format text fields with jcombobox
I have a GUI window asking for break time The result I want is, for example, 1:15 – int hours = 1 and int mins = 15 – …… -
Java – can I add or modify elements at the head of a link blocking queue?
Or perhaps it's better to use other classes to access data synchronously? Solution If you want to manipulate both ends…… -
Java – how to convert static variables in a class to JSON
Hello, I have a class constant that only contains static variables Public class constant public class Constant { p…… -
Java – when a statement is considered a single entry / single exit, when it is not?
I'm not sure if I can use it well. For example, if statements in Java are called single entry / single exit statements…… -
Java – Android: read the HTML of the web page into a string
I'm new to Android development. I'm trying to read the HTML of the web page, store it in the following string ("myhtml…… -
Inheritance in T and Java
I have a class a static field F: class A { public static String F = null; } Class B: class B extends A { public…… -
Java – too many garbage collection threads
I'm using java to develop software that creates a thread when receiving events (from sensors) The lifetime of these th…… -
Java – internal static class field visibility
I have two classes, as follows public class A{ private static class B{ private static int s1; private static …… -
Java – test greenmail without installing an SMTP server
I'm trying to use greenmail to test the email function on my localhost The problem is that I don't have an SMTP server…… -
Java regular expressions remove SQL comments from strings
I hope someone can help me solve this problem! I have an SQL file that looks like this: CREATE TABLE IF NOT EXISTS use…… -
The try catch block cannot suppress Java lang.NullPointerException
I got Java Lang.nullpointerexception, I don't know why I tried to use the try catch block, but it didn't work Can anyo…… -
Java – the code is compiled in eclipse, but not from the command prompt
The following code has no problem compiling in eclipse using JDK7 (I use update 10, but it should be used with any ver…… -
Java – find the nth prime
I wrote the following code to find the nth prime Can this improve time complexity? Description: ArrayList arr stores c…… -
java. Lang.illegalstateexception: unable to retrieve entitymanagerfactory of unitname crudpu
I need to test for my new job, but it seems that I'm in a coma JDBC / crudds has been configured on the server, Ping s…… -
Java – disable the open button in Jfilechooser?
I extended a Jfilechooser and overridden the approveselection method so that when the user selects an invalid director…… -
macos – 10.8. Java Web Start and native (Apple) Java 1.6 in 2 cannot find JRE
I'm trying to run some on the latest OS - X JNLP application (game) When doing so, Java Web start App suggests that I ……