Java
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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 – 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…… -
Illegalcomponentstateexception in Java Swing
When making the basic Java Swing program, I made a strange mistake. I only made it on my computer (I tried the other t…… -
Java antivirus… Is it possible? What about?
Can I write anti-virus programs in Java, for example, can I intercept the execution of programs? Can I have such deep …… -
Java – why string Indexof does not use exceptions, but returns – 1 when no substring is found?
Why string Indexof does not use exceptions, but returns - 1 if no substring is found? The purpose of this problem is: …… -
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 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 – spring boot deployed in Tomcat provides 404 but works independently
I've been testing spring boot with embedded Tomcat for about a month to build a rest API Everything is fine We now wan…… -
Java – recursive type parameters for almost circular type binding
I have the following two interfaces: /** * A marker interface to denote that an object implements a view on some othe…… -
Java – detect jsplitpane separation motion
Is there any way to detect when to move the jsplitpane separator? Is there any way to add a divider motion listener? J…… -
Check positive or negative without using conditional statements in Java
I had an interview question last week: I need a function to print whether a number is positive or negative without usi…… -
Java implements the compression of multiple files into compressed packages
This example shares the specific code of multiple file compression in Java for your reference. The specific contents a…… -
Java 8 Application on EC2
I wonder if anyone knows if it is possible to install Java 8.0 on EC2 instances My application is packaged as a fat ca…… -
Java – how to add the contents of a list to the end of another list?
How to append the contents of a list to the end of another list? Solution List. addAll() -
Lightweight web services produced in Java (no application server)
Is there any Java library that allows you to build a simple stand-alone Web service server without any application ser…… -
Java – JList – when you click a selected item, deselect it
If I click on the selected index on JList, I want it to be deselected In other words, clicking on the index actually s…… -
Examples of abnormal behavior in Java
Can anyone explain why the following if statement evaluates to false? public void addShapeToWhiteboard(PolyLine shape)…… -
Java – rxtx on MAC – serial port is already in use
I installed rxtx on my Mac Both Java jar program and Arduino software regard Arduino as a USB modem if they both claim…… -
Java – Dao and services?
I always have a problem. I can't really think of a service object that encapsulates many Dao methods I mean, for my se…… -
Implementation of simple and easy folder encryption with JavaScript
So today I want to tell you a good way: encrypt Windows 9x / 2000 folders. By encrypting a folder, all files in the fo…… -
Eloquent ORM code prompt phpstorm
So I just started with laravel (using V5) and eloquence I'm trying to get some basic APIs and run them, and notice tha…… -
java. lang.NoClassDefFoundError：org / springframework / context / EnvironmentAware
I am using spring MVC to create a web application I have started to integrate the spring security library When I try t…… -
Java – Stanford robot Karel throws NullPointerException
I have started to learn the programming method (cs106a) course on Stanford website I use eclipse indigo classic 3.7 1 …… -
Java square root integer operation is not cast?
Math. The sqrt() function takes double as the parameter and returns double I'm using a program that uses a perfect squ…… -
Java – which length is the string key of a HashMap that is considered a bad habit?
I always pay attention to good performance and clean code I tried to grasp whether it was reasonable to have a HashMap…… -
Java: interface vs abstract class (about fields)
From the content I collected, I want to force a class to use specific private fields (and methods). I need an abstract…… -
Java – using Apache velocity and spring framework 3.2 four
I'm new to spring. I want to use velocity to set it up Therefore, I created a new spring project, a new spring MVC pro…… -
Java – this: cannot be used in a static context
Can you help me with the following code? The error is: "cannot be used in static context" public class Sample2 { /…… -
Java – eclipse command line parameters
I know how to run my application using the run configuration menu and command line parameters My problem is that wheth…… -
Solution to the problem of Chinese garbled code in Java compressed zip file
Usually, after using java to package files to generate compressed files, there are two places where there will be garb…… -
Java – record JSON requests and responses for JSON
I have a Java Web application that exposes restful APIs My requirement is to record all JSON requests and responses pr…… -
Object oriented programming: abstract data types in Java
In this article, we will examine data types in Java, but we will introduce the concept of abstract data types (ADT). W……