Recent Posts
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What is the best way to inform administrators about new exceptions to Java applications?
My question is what is the best way to track exceptions from application administrators (for maintenance purposes, not…… -
Java – cannot catch constraintviolationexception
I can't seem to catch the constraint violation exception, but I see it in the log entity @Column(unique = true) privat…… -
Java – how to put scanner input into an array… For example, several numbers
Scanner scan = new Scanner(system.in); Scanner scan = new Scanner(system.in); double numbers = scan.nextDouble(); doub…… -
Java – get only the date of the timestamp
This is my following function. I'm passing a timestamp. I just need to return the date from the timestamp, not the hou…… -
How to use generics in Java to return numbers?
I have a class similar to the following, but I have a question about using generic return values import java.util.Arra…… -
Java – form field values set using pdfbox are not visible in adobe reader
I tried to use some Apache PDF@R_493_2419 @(1.8.5) to set some problems I have several different static PDFs that I us…… -
Unable to find Java nio. File package
My java compiler can't find Java nio. File package consider: import java.nio.file.*; public class Test { public st…… -
Java – creates a heap dump from within the application without the need for a hotspot diagnostic mxbean
How to create heap dumps in my application without using the hotspotdiagnosticmxbean class >This solution does not …… -
“Add to set” returns a Boolean value in Java – how about Python?
In Java, I like to use the Boolean value returned by the "add to collection" operation to test whether the element alr…… -
Java – JPA @ elementcollection list specifies the connection column name
I have the following entities: @Entity public class Shirt implements Serializable { @Id @Size(max=9) priv…… -
java – Resources. Openrawresource () releases Android
I have a database file in RES / raw / folder I'm calling resources Openrawresource(), the file name is r.raw Filename,…… -
Java – Android home screen shortcut permission error
In my program, it adds shortcuts to the screen I get the icon on the screen, but when I click it, I get: 03-01 20:00:2…… -
Java – the correct way to configure logs in wildfly 8.2
I'm setting up wildfly-8.2 0's log was confused Initially, I used my own log system, with log4j built into the war fil…… -
Java – how to capture window minimization events?
I want to create a JFrame instance and click the minimize button. I want to hide it in the system tray, usually the wi…… -
Java loop efficiency
I compared the efficiency of nested for, while and do while loops in Java, and I encountered some strange results that…… -
Java – quartz scheduler sample program gives an error
I tried to run on roseindi Net I have two classes in my java projecy and quartz version 1.6 - all. In the project libr…… -
Java / Swing: convert text string to shape
I want to convert some arbitrary text into shape (Java. AWT. Shape), and then stroke / fill the shape What shall I do?…… -
Java – how to convert an 18 Bit numeric string to BigInteger?
Someone can help me convert an 18 digit string number into BigInteger in Java Namely; The string "0x999999999999999999…… -
Declare a byte array in Java
How to declare a finite byte array? That's what I'm thinking, but it doesn't work. I can't find anything private Integ…… -
Java – enable lambda expressions
In the program entities.stream().filter(m->m.getId()==id).findAny().get(); Where entities are lists Set all librari…… -
Java – retrieves the subdocuments in the array as dbobjects
I'm new to mongodb. I'm using a Java driver I have this file structure: { "_id" : ObjectId("4f7d2ba6fd5a306d82687d48")…… -
How to print string with newline character in Java
I need to use java to print a string, so I like the following solutions, which have been searched a lot by Google I ma…… -
Java – use system exit(0)
public class WrapperTest { public class WrapperTest { static { print(10); } static void print(int…… -
Java – reference classes are constructed by classes
I am a web developer (game developer as a hobby) and I have seen myself using the following example several times (bot…… -
Javac: invalid target version: 1.8 on MAC when Maven command is executed
I'm running automated tests on the Mac I installed Maven and Java, JDK as follows: java version "1.8.0_25" Java(TM) SE…… -
Import javax servlet. Annotation cannot be resolved
I tried to create a servlet for my project, but I encountered import javax servlet. Annotation cannot be resolved I ha…… -
Java – real ORM: how to handle maps?
I'm creating an Android application. I need to persist map < string, MyClass > Solution As you've noticed, real …… -
GWT test error NoClassDefFoundError: COM / Google / GWT / dev / CFG / condition
Maybe someone can help me. I try to write my first GWT unit test, but this is the problem. When I run my test with mav…… -
Java – what is using atomicreferencearray?
When is it a good idea to use atomicreferencearray? Please give an example Solution It seems to be functionally equiva…… -
Java – what happens to the lost string object
Line 1: String x = "Java"; Line 1: String x = "Java"; Line 2: x.concat(" Rules!"); Line 3: System.out.println("x = " +…… -
Java exception handling – style
Historically, I have written my exception handling code: Cursor cursor = null; try { cursor = db.openCurso…… -
Java – the simplicity of OO for user interaction
As a summer project, when I have some uni downtime, I'm going to build a monopoly game This question is more about the……