Java
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Java – read barcode when program has no focus?
I want to write a simple program to read bar code, write down bar code and scanning time Unfortunately, I can't guaran…… -
How to quickly search for strings in large files in Java?
I'm trying to search a large text file (400MB) for a specific string using the following: File file = new File("fileNa…… -
java – Arrays. The fill() method caused an exception
Now I can't fill the array with spaces Whenever I use the array fill method, I encounter exceptions Now I've eliminate…… -
Java – JSF custom converter without calling null value
I'm outputting Java math. BigDecimal creates a custom converter When BigDecimal is 0.00 or null, I want to output dash…… -
Java garbage collection in the dialog box
*When I try to create a button in JFrame, I now encounter a very strange Java GC problem. When I click the button, it …… -
Java – log4j configuration file error detection
I am writing a recorder using log4j Once I load log4j Properties or log4j XML file, I wonder if there is a way to chec…… -
Java – there is no setter method in the interface
I have a concrete class a that implements interface B B ref = new A(); code: public interface B{ public abstract Str…… -
Java – completing an activity from another class
I'm developing an application that requires a permanent Internet connection If there is no Internet connection, I want…… -
How to convert float to double in Java?
See English answers > why converting from float to double changes the value? 9 public class DataTypes { static…… -
Java JDBC：Reply. fill()
I sometimes get the following exceptions: The problem is that the code executes successfully for a period of time, and…… -
Transform “Java. Net. Protocolexception: unexpected status line”, anyone?
My Android application crashed the following stack trace, but it worked well when I tried it from the desktop rest cli…… -
Make these balls bounce through Java collection iteration, any tips?
If the problem is not clear, but I can't think of another way to express it, I apologize This is my homework for worki…… -
Java – nonlocking IO vs blocking IO raw data throughput
There is a statement in Apache httpcomponent document: Really? Can anyone explain it in more detail? What is a typical…… -
Java – iterates the bits of char
Suppose I have a char "C" whose ASCII code is 0110 0111 How do I iterate its bits? I want to build a vector from these…… -
Java class with many types of ArrayList
I'm new to Android and Android Java and have questions about my server application communication My server always retu…… -
What does syso statement mean in Java?
What does the syso statement represent in Java? Solution System. out. Short for println(); In eclipse, you can type sy…… -
Try catch performance Java
How long (in nanoseconds) does it take to try catch exceptions instead of checking (assuming that the message has Hash…… -
Go to global variables that are not covered by goroutines
I write CMS in go and have session type (user ID, page content to be rendered, etc.) Ideally, I want this type to be a…… -
Java – generic method call
I have this code from "Java - Beginner's Guide - Schildt", Chapter 13: package com.chapter.thirteen; public class Gen…… -
. Net – thread stack and stack
How to generate new threads, i.e. memory heap, how memory stack is related to threads, and how to allocate memory? I k…… -
Java – what is netbean lookup?
It's hard for me to understand that Basically, this lookup API is used to maintain the loosely coupled nature between …… -
Java – you can write generic xmladapters
I know that I can use raw type to write XML adapter, but I can use generic type I tried to read the API, but I didn't …… -
Java – use Proguard to confuse actionbarsherlock
I'm trying to blur my Android application with Proguard and ant (eclipse Proguard never works, always fails, error 1) …… -
Grizzly – java. lang.NoSuchMethodError：javax. xml. ws. WebFault. messageName
I have a WSDL file for the web service I want to test the interaction between the client and the server To do this, I …… -
Java – missing classpath entry in eclipse
I am using eclipse, Helios service release 2, build ID: 20110218-0911 I created a new dynamic website, in which I adde…… -
Java – set EditText to a single line so that it loses focus after pressing enter
I use EditText in my code and compare its contents with a string when I click a button setSingleLine(true); Prevent th…… -
Java – refresh and get entities after saving (JPA / spring data / Hibernate)
I have these two simple entities something and property Things: @Entity @Table(name = "something") public class Someth…… -
Java phantom JS behaves differently in windows and Linux
I've been trying to solve this problem, but I don't know why, Phantomjs in PC and server is the same v.2 0 In windows …… -
Effective Java: security of forwarding classes
Effective java version 3, Item 18: composition over inheritance describes the problem of adding behavior to classes us…… -
The wrong class was called in the multi version JAR file on Java 9?
I found a problem with the applet using multiple versions of jar. I hope someone can help me I have a very simplified …… -
JavaFX – drag and drop works differently in Java 11 than in Java 8
I wrote a program that uses the drag and drop function in JavaFX It works perfectly in JavaFX 8 In JavaFX 11, the drag…… -
Multithreading – STD:: this_ Thread:: yield() usage?
Can someone provide STD:: this in C application_ A real example of the use of thread:: yield()? Solution I used yield ……