Recent Posts
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Java mongodb 3.0 driver query without filter
How do I query using the Java mongodb 3.0 driver? I tried to query unique category records from the location collectio…… -
Java – many Boolean flags are entered into the class
I have a dialog box that displays various contents according to the status of the application and the security of the …… -
Arguments of type ‘volatile char *’ are incompatible with arguments of type ‘const char *’
I have a function whose prototype is as follows: void foo(const char * data); Elsewhere in my code, I have a global va…… -
Infinite loop in Java
I'm new to Java I tried to extract employee data from a text file and store it in a collection I use stringtokenizer t…… -
Java – maximum flow using custom comparator
The following is my specially written code for using a custom comparator with Max in Java 8 stream import java.math.Bi…… -
Java – what is the exact difference between these two sets of statements?
Set<Type> union = new HashSet<Type>(s1); Set<Type> union = new HashSet<Type>(s1); and Set<T…… -
Java – ArrayList and indexof problems of my objects
I have an ArrayList problem with Java I created an object that contains two attributes X and Y. now I loaded some obje…… -
Java – how do I pass parameters to a thread and get the return value?
public class CalculationThread implements Runnable { public class CalculationThread implements Runnable { int inp…… -
E-mail module in Java?
Please suggest the best email module for sending email in Java Solution To further simplify the use of JavaMail, you c…… -
Java – how to load property files based on spring configuration files
How to create a project architecture to support multiple environments With the help of spring, each environment will h…… -
Java – how do I automatically log in to this site using system credentials?
I need to develop a web application for intranet users I don't want them to enter login credentials every time they vi…… -
Java – how to find an executed SQL query that does not return anything?
import java.net.URL; import java.net.URL; import java.net.URLConnection; import java.sql.*; public class searchlink{ p…… -
Java – when to use getinstanceof instead of constructor
A few months ago, I attended a speech hosted by representatives of two independent software development companies It i…… -
Java – other languages in PHP and Hadoop / MapReduce implementations and other languages in the cloud
I began to learn some Hadoop / MapReduce, mainly from PHP background, and only need some Java and python However, it s…… -
How do I force two Java threads to run on the same processor / core?
I want a solution that does not include critical parts or similar synchronization alternatives I'm looking for somethi…… -
Java thread is in doubt
I previously published a query about Java threads ( link text) Based on the answers I received, I decided to implement…… -
How do I send commands to a running Java program?
I have a java program that I want to send commands from my Win32 Application Usually I use WM_ COPYDATA, but what opti…… -
Java – sun. Not found security. ssl. SSLSessionImpl
When I try to use okhttp or javax ws. rs.client. Client, the following error occurs In sun security. Search in SSL pac…… -
Java – Android navigationview cannot respond to the click event on the project
I'm trying to add a Navigation view to my application, but for some reason, I can't make it respond to any click event…… -
Java – generics and comparators
I was studying generics and found that the following code gave compile - time errors when comparing methods class A<…… -
What is a “runtime class” in Java?
I try to understand object The function of the getClass () method Documentation means that it "returns the runtime cla…… -
Unit test – how to simulate the improved service observable that calls onerror?
I'm testing this code service.getProducts() .subscribeOn(Schedulers.io()) .observeOn(AndroidSc…… -
Being confused by Java generics requires a cast
I'm confused about the following code: import java.util.ArrayList; import java.util.LinkedList; import java.util.List;…… -
Java – applet – how do I use this code using strings instead of characters?
I'm slowly trying to write a program that converts hexadecimal numbers to decimal numbers I'm not interested in readin…… -
Why not use class for Java – t getInstance (final type)?
So I'm delving into Java and curious about the use of this type parameter <T>T getInstance Then arg Class<T&g…… -
Java – why is enum considered safer than constants?
In our example, we can choose to define an enumeration type that will limit the possible specified values (i.e. improv…… -
How do the consumer and begin methods work within the Java functional interface
Who can let me know how the following procedures work internally: public class Main { public static void main(String…… -
How to perform memory analysis on remote Java Web Applications
I know we can use tools like jpprofiler Any ideas? Solution You have visualgc, which is not very advanced, but you can…… -
Java – commons exec: when I call the executor Suspend when execute (commandline);
I don't know why I try to capture the output of the process through commons exec, and then I continue to hang I have p…… -
An attempt to use resources in a multithreaded server in Java
I'm reading a book "java networking 4th Edition" and Chapter 9 on server sockets, while explaining the multi-threaded …… -
Java string format
I have a property file containing strings in the following format: audit.log.events.purged=The audit events were purge…… -
Java / Swing: low key button height?
I want to reduce the vertical size of JButton The following code applies to k > 1, but I can't seem to reduce the s……