Java
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Java – is it bad practice to save data in static variables?
(this exact question may have been asked before. I can't find it through search. If you find that it has duplicate tag…… -
Java converts a unit to a string of integers
I want to convert strings such as' 1g 'or' 100k 'or' 15. 3M 'to integers I suspect it's floating around some libraries…… -
Java – why project specific runtimeException?
There is a com myco. myproj. Does myprojruntimeexception have any meaning, Solution Yes Throw unchecked exceptions and…… -
java. Lang. outofmemoryerror: cannot create a new native thread
I see such comments At Sun Java Forums In my application, we initially planned to use threads, but then we decided we …… -
How to wait for the Java applet to finish loading on safari?
This does not work in Safari: <html> <body> <applet id="MyApplet" code="MyAppletClass" archive="MyApple…… -
Bluetooth – bluecove library not available – error using bluecove / Java
How do I install bluecove in the Ubuntu 11 / eclipse ide? As far as I know, all I have to do is bring bluecove Jar and…… -
UTF-8 and utf-16 in Java
I really hope the following byte data should show different, but in fact, they are the same, according to wiki http://…… -
Java – pass the map to the method that needs the map
I have a method with the following signature public static ActionDeFinition reverse(String action,Map<String,Object…… -
Java – lock static members of a class
According to my understanding, the following code should cause deadlock However, the program runs normally and prints …… -
Java – string contains at least one number
I try to see if the string contains at least one number, either lowercase or uppercase I wrote this: int combinations …… -
Java – why use printf (‘% s’) to pass parameters to generic methods?
package genericMethods; package genericMethods; public class OverloadedMethods { /** * @param args */ …… -
Multithreading – does Delphi class variable have global or thread local storage?
My guess is that the class variable ("class var") is a real global variable in storage (that is, an instance of the wh…… -
Java – why does HashMap insert new nodes on the index (n-1) and hash?
Why does HashMap insert a new node on the index Where hash = key hashCode()^ key. Hashcode() > > > 16 and N =…… -
Java – keytool creates a trusted self signed certificate
I'm trying to create a self signed certificate using (Java) keytool, but when I try to use it, I get the following exc…… -
Java – how does soap support asynchronous calls but rest does not?
Through soap vs rest on the Internet, I found that most people said that soap supports asynchronous calls, but rest di…… -
java. Lang. outofmemoryerror: Java heap space when initializing arrays
I tried to initialize a Boolean array whose size is a 10 bit integer It continues to throw OutOfMemoryException I have…… -
Layout manager preferredSize Java
I'm still trying to learn how layout manager works I made a frame with two jpanels I set the preferredSize of each pan…… -
Java – returning an int from a native function (C, JNI) causes the application to crash
Trying to figure out why returning an int from a C function call causes the entire application to crash without any er…… -
How do Erlang virtual machines run as daemons?
I want to run Erlang VM as a daemon on a UNIX server in non interactive mode Solution The easiest way is to give the E…… -
Eclipse 4.3.0 with Java 8 patch 2 unrecognized source level 1.8
I am using eclipse 4.3 with patches for Java 8 2, as well as M2e and subclipse, completely update all contents to the …… -
Compare twice in Java more or less
Date date1= new java.util.Date(); Date date1= new java.util.Date(); java.sql.Date sqldob = new java.…… -
Java – using quartz and spring
In my application, I need to be able to create scheduled jobs (dynamically) based on the incoming request type Can I a…… -
Java – jspinner: increase the length of the edit box
I have a jspinner that displays decimal values from 0.0 to 999.0 It seems to work properly, except that it displays a …… -
Overhead and code speed (java.io.file array and java.lang.string array)
Just trying to sort out a small category I have here At present, I am developing an application involving collecting t…… -
Java – CompareTo may return 0 instead of TreeSet / treemap
I need an ordered set of objects and am currently using TreeSet My problem is that CompareTo of objects usually return…… -
java. util. zip. Zipexception: duplicate entry with firebase
I'm building an application using firebase, but I got a duplicate class error I checked all dependencies, but I couldn…… -
java – DataOutputStream#writeBytes(String)vs BufferedWriter #write(String)
I want to create an HTML file for my report You can use bufferedwriter #write (string) to create the content in the re…… -
Java – randomgenerator – lost 50% of aircraft simulation
I'm working on a problem that I'm a little confused The problem is, suppose you were a general of the British air forc…… -
In Java, is there a more concise method for if statements with a large number of |
I know this problem is basic, but I'm looking for a less clumsy method. The following if statement: if ((sOne.Contains…… -
Is Java: executorservice less efficient than manual thread execution?
I have a multithreaded application When using thread When start () starts threads manually, each concurrent thread use…… -
Java – how to use apostrophe (‘) in XPath when using webdriver to find elements?
I need to use an apostrophe (') in my XPath expression, and I need to use it when using webdriver to find elements I n…… -
Java – can I close and reopen the socket?
I learned an example of socket use In this example, the client sends a request to the server to open the socket, and t……