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JAVA QUESTIONS

How do you write a deconstructor in Java?
How do you write a deconstructor in Java?
With these it helps You do not need (nor should you try to use) destructors - or what they are called in Java: "Finalizers".The VM specification does allow for VM implementations to never call them. So they are not reliable for resource releases and
TAG : java
Date : November 01 2020, 07:01 PM , By : huijin0103
Java Equivalent to .NET's DateTime.Parse?
Java Equivalent to .NET's DateTime.Parse?
it helps some times See parse method in DateFormat Class. Here is a sample
TAG : java
Date : November 01 2020, 07:01 PM , By : user3855298
Java File.isDirectory() returns False for a Directory in Linux
Java File.isDirectory() returns False for a Directory in Linux
I wish this help you Symlinks don't read as directories, if I remember correctly. The right way around that is:
TAG : java
Date : November 01 2020, 07:01 PM , By : pg2014
Changing layouts in SWING
Changing layouts in SWING
around this issue You may want to start with the Java Tutorials on GroupLayout.
TAG : java
Date : November 01 2020, 07:01 PM , By : user3855272
Uncheck all checkboxes added as a group
Uncheck all checkboxes added as a group
this will help The behavior you're asking about is half-check-box and half-radio-button, and here's how you do it right: Make it a group of five radio buttons, the first of which (or last) basically says 'none of the other options'.
TAG : java
Date : November 01 2020, 07:01 PM , By : user3855271
How to fix "cannot find symbol" error in java
How to fix "cannot find symbol" error in java
this one helps. Found the solution to my error thanks to some helpful comments I needed to import the function package :
TAG : java
Date : October 31 2020, 08:00 PM , By : ashwani
How to read a file in a jar?
How to read a file in a jar?
hop of those help? ImageIO.read(File) method is using file IO which is not suitable for reading resources from the classpath. Assuming that Schiebepuzzle.jar is on the classpath you can use ImageIO.read(InputStream) method:
TAG : java
Date : October 31 2020, 08:00 PM , By : Sergey S
Removing all non-digits from string
Removing all non-digits from string
Any of those help Strings are immutable. Once you have a String object, its content won't ever change.To provide you with a different String, replaceAll() returns a new String with the changes requested, as do all other similar methods. It doesn't ch
TAG : java
Date : October 31 2020, 08:00 PM , By : Michal Horák
Read a value from an XML file
Read a value from an XML file
Any of those help I know how to read a simple XML file in Java using getelementbyTag but here I want to read the MAC address from here which is 01-0C-CD-01-00-34 in Java. , You can use xpath to find specific parts of an xml doc
TAG : java
Date : October 31 2020, 08:00 PM , By : Görkem Öztürk
Java thread join()
Java thread join()
I wish did fix the issue. If I have one array of 10 thread ready "to be used" and if I have something like , Use two loops. In the first one you should start all threads:
TAG : java
Date : October 31 2020, 08:00 PM , By : Neel gor
How do you initiate/force a download for files that reside externally in PHP or other language?
How do you initiate/force a download for files that reside externally in PHP or other language?
Hope that helps You will have to load the resource on the server first. You might want to do some caching also:
TAG : java
Date : October 31 2020, 08:00 PM , By : Naveen Pal
Ehcache midnight/nightly expiration strategy
Ehcache midnight/nightly expiration strategy
wish of those help It sounds like you should implement it using a Cache Extension"Cache Extensions are suitable for timing services, where you want to create a timer to perform cache operations."
TAG : java
Date : October 31 2020, 08:00 PM , By : user3855233
Maven and native libraries
Maven and native libraries
should help you out If you just want to add the native libraries to the class path, try to put them in src/main/resources.Update: You can specify where resources exist in the POM:
TAG : java
Date : October 31 2020, 08:00 PM , By : Gunjan
How to configure Classpath in Websphere application server?
How to configure Classpath in Websphere application server?
this will help As Michael Ransley mentioned, you need to determine who needs log4j. If it is a web application, then WEB-INF/lib is the best location.If it used by EJB components then place the log4j as a utility jar in the EAR.
TAG : java
Date : October 31 2020, 08:00 PM , By : user3855213
Scraping with multiple IP, in java
Scraping with multiple IP, in java
may help you . Well basically I have a scraping application. It scrapes around n items per minute. currently i have only one IP.
TAG : java
Date : October 31 2020, 08:00 PM , By : bryanjhlim
Is the stack garbage collected in Java?
Is the stack garbage collected in Java?
I hope this helps . The memory on the stack contains method-parameters and local variables (to be precise: the references for objects and variables itself for primitive types). That will be automatically removed if you leave the method. If the variab
TAG : java
Date : October 31 2020, 08:00 PM , By : ItsMeMario
How to get print out of a ms word file from java application
How to get print out of a ms word file from java application
fixed the issue. Will look into that further This example from the OpenOffice API might be useful.
TAG : java
Date : October 31 2020, 08:00 PM , By : user3855169
Entities equals(), hashCode() and toString(). How to correctly implement them?
Entities equals(), hashCode() and toString(). How to correctly implement them?
around this issue equals() and hashCode() should be implemented using a business key - i.e. a set of properties that uniquely identify the object, but are not its auto-generated ID.in toString() you can put whatever information is interesting - for e
TAG : java
Date : October 31 2020, 08:00 PM , By : user3855164
How can I discover if my program has terminated normally?
How can I discover if my program has terminated normally?
it should still fix some issue I'm guessing a little here, since your question is kinda vague. But I assume you talk about finding out within your program that this program terminated normally or not when it was last run.If you got something of a con
TAG : java
Date : October 31 2020, 08:00 PM , By : user3855150
How to solve docbuilder SAX exception: unexpected end of document?
How to solve docbuilder SAX exception: unexpected end of document?
I hope this helps . An XML document must have one, and only one, root element.You should have a element (or similar) wrapping your group of s.
TAG : java
Date : October 31 2020, 08:00 PM , By : Samma
What is the fastest method to parse XML?
What is the fastest method to parse XML?
like below fixes the issue Generally, you have three options: DOM, SAX and StAX. DOM is slower.StAX is said to provide "DOM ease with SAX efficiency". But in case the document you showed is the whole document - it really doesn't matter. The performan
TAG : java
Date : October 31 2020, 08:00 PM , By : user3855138
Want to extend from java.sql.ResultSet
Want to extend from java.sql.ResultSet
fixed the issue. Will look into that further Do not extend ResultSet. Create your entity class, let say Person. And implement 'get some date' method. Like so
TAG : java
Date : October 31 2020, 08:00 PM , By : user3855111
Detecting mouse enter/exit events anywhere on JPanel
Detecting mouse enter/exit events anywhere on JPanel
I think the issue was by ths following , Basically there is a JPanel on which I want to know when the mouse enters the area of the JPanel and exits the area of the JPanel. So I added a mouse listener, but if there are components on the JPanel and the
TAG : java
Date : October 31 2020, 08:00 PM , By : BoxasFrame
java Database framework comparison
java Database framework comparison
I wish did fix the issue. There is a basic choice you need to make between: Object-relational mappers (ORMs); or SQL-based frameworks.
TAG : java
Date : October 31 2020, 08:00 PM , By : dhivya
stoping doGet/dopost in java servlets?
stoping doGet/dopost in java servlets?
wish of those help your stop handler can set a flag in the session context, which the long-running thread will occasionally check and exit if necessary.you can avoid the multiple browser issue, by generating a unique task id each time the page is loa
TAG : java
Date : October 31 2020, 08:00 PM , By : Amit Prajapati
Saxon XSLT-Transformation: How to change serialization of an empty tag from <x/> to <x></x>?
Saxon XSLT-Transformation: How to change serialization of an empty tag from <x/> to <x></x>?
will help you As far as XML is concerned and are the same thing.See the XML 1.0 spec about this.
TAG : java
Date : October 31 2020, 08:00 PM , By : Viktor Danilevich
Spring 3 pet clinic example uses ${owner.new}, in the JSTL EL where can I read about out about .new operator?
Spring 3 pet clinic example uses ${owner.new}, in the JSTL EL where can I read about out about .new operator?
wish helps you In the expression ${owner.new}, the dot operator is used to access a property named new of the object referenced by the owner identifier. The EL accesses object properties using the Java beans conventions, so a getter for this property
TAG : java
Date : October 31 2020, 08:00 PM , By : Bĺáck'k Bóy
How to use Java generics method?
How to use Java generics method?
I hope this helps . The compiler doesn't know that you are going to pass to getValue() an instance of a class that has a getValue() method, which is why t.getValue() doesn't pass compilation.It will only know about it if you add a type bound to the g
TAG : java
Date : October 30 2020, 08:01 PM , By : RISHABH MISHRA
How would I fix the Syntax error insert '}' to complete block
How would I fix the Syntax error insert '}' to complete block
should help you out You need to put one } before you begin the public static String encrypt(String dot, SecretKey secretKey) method, i.e. after your for-loop ends
TAG : java
Date : October 30 2020, 08:01 PM , By : A.fatimah
2-D Arrays in Java
2-D Arrays in Java
will be helpful for those in need A 2d array is just a way to organize your data into a grid. It is an array of arrays. In your case, for every possible launch angle and velocity, you calculate the distance achieved. So if you used a two-dimensional
TAG : java
Date : October 30 2020, 08:01 PM , By : lollercoaster
Java OOP exercise
Java OOP exercise
To fix the issue you can do There are 2 fundamental parts of the question that you are missing in your program:1) Once you exit, the system will prompt for an id again. Thus, once the system starts, it will not stop.
TAG : java
Date : October 30 2020, 08:01 PM , By : Vamsi Nag
Accessing DLL pointers through Java
Accessing DLL pointers through Java
may help you . Looking at the type definition for the function, I would make an educated guess and say that pData is the array pointer to which the function writes the read memory. You can use int[] directly here. Since the status is returned as an o
TAG : java
Date : October 30 2020, 08:01 PM , By : stephen joseph
Runnable::new vs new Runnable()
Runnable::new vs new Runnable()
I wish this help you Your run method takes a Runnable instance, and that explains why run(new R()) works with the R implementation.R::new is not equivalent to new R(). It can fit the signature of a Supplier (or similar functional interfaces), but R::
TAG : java
Date : October 30 2020, 08:01 PM , By : Rahul
Java Get last key from Hashmap
Java Get last key from Hashmap
this one helps. HaspMap doesn't preserve order.So,Its not possible to get any element via position either last, first or middle. One thing you can do is that save your key in some variable when do insertion in HashMap and access that variable to get
TAG : java
Date : October 30 2020, 08:01 PM , By : Expedito Cordeiro
Struts2 - The list key couldn't be resolved
Struts2 - The list key couldn't be resolved
Any of those help am working on Struts 2 radio button. I want to retrieve the list from my action class but it is giving following error , You need getter methods for genders and languages.
TAG : java
Date : October 30 2020, 08:01 PM , By : cooookie
h2 (embedded mode ) database files problem
h2 (embedded mode ) database files problem
wish help you to fix your issue For embedded mode, you'll need to check the path. For example, use a path relative to your home directory:
TAG : java
Date : October 30 2020, 08:01 PM , By : msm
Is there a timeout for threads waiting on a synchronised method in Java?
Is there a timeout for threads waiting on a synchronised method in Java?
I wish did fix the issue. The JLS does not specify any timeout for synchronized sections. It just mentions
TAG : java
Date : October 30 2020, 08:01 PM , By : user3854949
WTK emulator bluetooth connection
WTK emulator bluetooth connection
may help you . I tested almost same code from NetBeans IDE 6.8 with WTK 2.5.2_01 emulator and it works well. (I mean it discovered device)
TAG : java
Date : October 30 2020, 08:01 PM , By : user3854919
Cannot find a free socket for the debugger in eclipse
Cannot find a free socket for the debugger in eclipse
will be helpful for those in need I have found the solution (at least in my case).Eclipse was installed on a company share drive once I moved it to my local C drive everything worked fine.
TAG : java
Date : October 30 2020, 08:01 PM , By : Touxiong Xiong
Hibernate - EhCache - Which region to Cache associations/sets/collections?
Hibernate - EhCache - Which region to Cache associations/sets/collections?
Any of those help So for the set children, should we specify the region org.demo.parent.children where it should cache the association or should we use the cache region of org.demo.children where the children would be getting cached.
TAG : java
Date : October 30 2020, 08:01 PM , By : Real Re
Struts 1 - struts-taglib.jar is not being found by my web application
Struts 1 - struts-taglib.jar is not being found by my web application
like below fixes the issue You say the JAR does appear in the WEB-INF/lib for the web app; I'll take your word for it and believe you.I would suggest that you open up the struts-taglib.jar, open the .tld for the tag library, and verify that the value
TAG : java
Date : October 30 2020, 08:01 PM , By : Mohamed Ahmed
return type of main in java
return type of main in java
I hope this helps you . The short answer is: Because that's what the language specification says.In today's commonly used operating systems (Windows and Unix families), the only "return value" from a process is an exit status, which is a small number
TAG : java
Date : October 30 2020, 08:01 PM , By : user3854852
how to create internal frame in netbeans platform?
how to create internal frame in netbeans platform?
should help you out The customary Container for JInternalFrame is JDesktopPane. The article How to Use Internal Frames outlines the essentials, and you may like this short example of using Action and JMenu in this context.Although the NetBean's GUI e
TAG : java
Date : October 30 2020, 08:01 PM , By : DrJimDPhD
java: Read text file and store the info in an array using scanner class
java: Read text file and store the info in an array using scanner class
I wish did fix the issue. I have a text file include Student Grades like: , Try useDelimiter(" \\$ |[\\r\\n]+");
TAG : java
Date : October 30 2020, 08:01 PM , By : Habib Ur Rehman Must
Dynamically building and updating Histograms with JFreeChart
Dynamically building and updating Histograms with JFreeChart
wish of those help It sounds to me like you have a classic MVC scenario. Your chart is the view, and your controller will coordinate rebuilding this view based upon your model. So you should build your model to reflect the data coming in, and the con
TAG : java
Date : October 30 2020, 08:01 PM , By : user3854769
the characters except 0x00-0x7F are not been shown when converted to "UTF-8" from "ISO-8859-1"
the characters except 0x00-0x7F are not been shown when converted to "UTF-8" from "ISO-8859-1"
I wish this help you I know the default encoding of the Java net transmission is "ISO-8859-1"
TAG : java
Date : October 30 2020, 08:01 PM , By : Andrew Tridgell
scala 2.8 implict java collections conversions
scala 2.8 implict java collections conversions
I wish did fix the issue. JavaConversions does not support the conversion between a scala List (immutable, recursive data structure) and a java List (a mutable sequence). The analog in scala is a buffer:From the scaladoc
TAG : java
Date : October 30 2020, 08:01 PM , By : user3854723
Pure Java HTML viewer/renderer for use in a Scrollable pane
Pure Java HTML viewer/renderer for use in a Scrollable pane
like below fixes the issue Since Java 8, you can use JavaFX's WebView Component, which can also be used in Swing.Code is as simple as:
TAG : java
Date : October 30 2020, 08:01 PM , By : user3854700
Analysing a JVisualVM profile - finding the source of large numbers of primitive types?
Analysing a JVisualVM profile - finding the source of large numbers of primitive types?
wish helps you VisualVM does compute retained size. You have to add the column manually, the default view doesn't seem to have it though.
TAG : java
Date : October 30 2020, 08:01 PM , By : balachia
Java multi-threading - what is the best way to monitor the activity of a number of threads?
Java multi-threading - what is the best way to monitor the activity of a number of threads?
wish help you to fix your issue Don't think in terms of threads, which are OS objects and carry no application semantics, but in terms of tasks. A Thread cannot know it is 50% complete, a task can. Look at the facilities in java.util.concurrent for m
TAG : java
Date : October 30 2020, 08:01 PM , By : Caleb Tagliaferri
Why output keeps same many output?
Why output keeps same many output?
should help you out You're using System.in.read() to read in the next character, but when you type a character and hit enter, you're actually entering three characters: The character you typed, a carriage return character ('\r'), and a newline charac
TAG : java
Date : October 29 2020, 08:01 PM , By : beingme
Isn’t there an “132” pattern in [3,5,0,3,4]?
Isn’t there an “132” pattern in [3,5,0,3,4]?
I wish this helpful for you From the definition of the 132 pattern it's obvious that you need to manage 3 indexes i, j and k in order to loop through all the possible triples of the array items that satisfy the condition i < j < k.So:
TAG : java
Date : October 29 2020, 08:01 PM , By : Kidon Sull
Android playing Video data from a custom network stream?
Android playing Video data from a custom network stream?
hope this fix your issue Does Android MediaPlayer can only work with file sources? I would like play media (video) from a network stream, but the stream comes in a non-standard protocol, so I have to somehow feed Android MediaPlayer with the data onl
TAG : java
Date : October 29 2020, 08:01 PM , By : LordCacops
generation of random numbers in java
generation of random numbers in java
this will help If you have 30 numbers and you need those 30 numbers to be found by your method, then a random generator won't be good for you. In that case, I think it would be more recommendable to add those 30 numbers to a List and call the method
TAG : java
Date : October 29 2020, 08:01 PM , By : user3854627
Anyone know about Jasypt (Java encryption library)?
Anyone know about Jasypt (Java encryption library)?
it fixes the issue I have come across it in my occupation and found it useful for verifying encryption algorithms from another source. I can't go into much detail of my verification processes but if you want to be able to encrypt data local to your P
TAG : java
Date : October 29 2020, 08:01 PM , By : qwertyuiop4845845684
Use class name as root key for JSON Jackson serialization
Use class name as root key for JSON Jackson serialization
seems to work fine By adding the jackson annotation @JsonTypeInfo in class level you can have the expected output. i just added no-changes in your class.
TAG : java
Date : October 29 2020, 08:01 PM , By : RobertG
Java - Removing duplicates in an ArrayList
Java - Removing duplicates in an ArrayList
I think the issue was by ths following , Why not use a collection such as Set (and an implementation like HashSet) which naturally prevents duplicates?
TAG : java
Date : October 29 2020, 08:01 PM , By : user3854554
How do I alias the scala setter method 'myvar_$eq(myval)' to something more pleasing when in java?
How do I alias the scala setter method 'myvar_$eq(myval)' to something more pleasing when in java?
may help you . I've been converting some code from java to scala lately trying to teach myself the language. , You can use Scala's bean property annotation:
TAG : java
Date : October 29 2020, 08:01 PM , By : user3854543
Difference in System. exit(0) , System.exit(-1), System.exit(1 ) in Java
Difference in System. exit(0) , System.exit(-1), System.exit(1 ) in Java
may help you . The parameter of exit should qualify if the execution of the program went good or bad. It's a sort of heredity from older programming languages where it's useful to know if something went wrong and what went wrong.Exit code is
TAG : java
Date : October 29 2020, 08:01 PM , By : lembark
Read multiple lines from InputStreamReader (JAVA)
Read multiple lines from InputStreamReader (JAVA)
seems to work fine First of all mind that InputStreamReader is not so efficient, you should wrap it around a BufferedReader object for maximum performance.Taken into account this you can do something like this:
TAG : java
Date : October 29 2020, 08:01 PM , By : Shiquana Mishaella

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