Java
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Java – is there a simple and safe way to convert a printwriter to a printstream?
Is there a simple way to use Java io. The instance of printwriter is converted to Java io. PrintStream？ Solution Firs…… -
What are the methods of drawing 3D trees using Java and OpenGL?
I know how to draw basic objects using jogl or lwjgl to connect to OpenGL What I want is something that can generate s…… -
How to use java to control the LED lights connected to PC through USB / SerialPort, etc? What equipment should I use?
I want to write a program in Java, which can control the LED light to connect to the "thing" connected to the computer…… -
Java – return try block in block vs return block
I have a try statement in a small static method. Is there a best practice for where I should return? try { mightTh…… -
Java – add some days for jodatime instant
I'm trying to write a simple utility method to add an integer day to joda time instant This is my first attempt /** *…… -
Java – disable all reports in Maven’s project info reports plugin
I want to generate custom reports through Maven's site plug-in, but only this custom report, instead of all reports ge…… -
Java – which is better when calling a function: twice or storing the result in a variable?
I doubted this problem many times, but I couldn't find the right solution I'll clear it this time I like something 1. …… -
Java – Android gets the PID of other applications
I want to be able to start an activity or service and get the PID of the process as soon as possible, which will be th…… -
Java – what does “reference implementation” mean?
I'm trying to learn the cachedrowset in Java, and I'm reading some tutorials about it for example Who can please be ki…… -
How do I catch all checked exceptions (in a single block) in Java?
Editor: this problem only involves Java 1.6 (and below) I'm sorry I didn't make it clear in the original post The hier…… -
Java – how can restful web services be better than soap based web services
I have experienced various websites, and the only answer they provide is – restful web services use HTTP's own methods…… -
How to wait for multiple nested asynchronous calls by using rxjava Android?
I'm new to RX Java. This is my situation, >Send request a and get the list < a > back > for each a, send r…… -
Java – add multiple jpprogressbars to the tablecolumn of JTable
I have added multiple jpprogressbars to the tablecolumn of JTable After some calculations, I'm updating all jpprogress…… -
Java – is there a way to expose hibernate entities as restful resources without dto?
I'm developing a simple webapp that exposes the domain model as a restful resource When grouping hibernate entities in…… -
Java – who calls the class initializer method and when?
I know that the new DUP, invocation and astere bytecode patterns will call the instance initialization method < ini…… -
Software testing tool – for Java
Can anyone list five software "software tests" in a java project? I need to learn 5. What do you recommend? Solution &…… -
Groovy equivalent of Java 8 lambda expression
I have only one method that has this java interface@ H_ 419_ 2@// Java Interface public interface AuditorAware { Audit…… -
What is the correct code pattern for completing transactions in Java (exception rollback and successful commit)?
I am looking for a common code pattern to correctly handle transactions that may be abnormal I assume that there is a …… -
Java – what happens when l (long) – = f (float)?
See English answers > floating point arithmetic not producing exact results 7 public class SimplePrint { public st…… -
Java: enumeration and if then else performance
I didn't have real luck. I used Google to get this concise answer rather than my time-consuming evaluation. I thought …… -
Java: look and feel
What happens when I use NetBeans on a Windows machine is that if I run the main java file, I get a different look than…… -
Java – how do I decide which bufferedimage image type to use?
The Java bufferedimage class has a long list of class variables called image types, which can be used as parameters of…… -
How do I synchronize from two processes – atomic writes on one file?
I have two processes. Each process writes big data buffer. I want to control the synchronization of these processes to…… -
Java – when should I use inputstreamreader and outputstreamwriter?
From the Java Tutorial site, we know that inputstreamreader and outputstreamwriter can convert streams between bytes a…… -
Java – hibernate criteriabuilder connects multiple tables
I'm trying to add four tables using hibernate criteriabuilder @Entity public class BuildDetails { @Id private …… -
Java concurrency JDK 1.6: is busy waiting better than signaling? Valid Java #51
Item 51 of Joshua Bloch's "effective Java" does not depend on the thread scheduler, nor does it unnecessarily retain t…… -
Java – spring 5 – how to provide static resources
I'm trying to provide static resources in my web application. I've tried: @SuppressWarnings("deprecation") @Bean WebMv…… -
Java – property of type not found in JSF
I tried to invoke an attribute using primefaces in JSF. But I have the type managedbean Error 500 not found on persone…… -
Java – how to read BufferedReader two or more times?
I have a text file, one integer per line – 10 20 50 I want to read and print these numbers twice or more I tried some …… -
Java – optimistic locking and org hibernate. StaleObjectStateException：
I'm just trying to be optimistic I have the following courses: @Entity public class Student { private Integer id;…… -
Java – spring: how to get application context in webapp and standalone programs
I'm new to the spring framework We want to introduce it into the web application (3.1). At present, we use struts in t…… -
How can I find where bufferedimage uses alpha in Java?
I have a buffered image and a Boolean [] [] array It's like: for(int x = 0; x < width; x++) { for(int y = 0; y ……