Java
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Is it necessary to explicitly disconnect from the database when using Java?
After completing the job in Java, you must disconnect from the database? If the connection is not disconnected, will i…… -
Java – sort F: selectitems list based on tags
I have a list of selectitem values and tags The data is obtained from the database. The selectitem list has the follow…… -
Java: expect ArrayList
I have a class called storage Stores an ArrayList. List that contains a special object named products Each product con…… -
Java – store the int value of the bitmask – extract the bit of 1 value
I'm calculating the int equivalent for the location set and storing it in memory From there, I want to determine all 1…… -
Sorting tuple counts in Java
I'm building a class with string to integer mapping So if I have three apples, I will map apples to three I need to wr…… -
Java – multiple swing event dispatch threads
I want to create a new event dispatch thread in swing, but I can't find any references online about how to do this I c…… -
Java socket non blocking read
I am using datainputstream to read characters / data from the socket I want to use it readUnsignedShort(); If there ar…… -
Java – how to get to the middle of a singular linked list in an iteration?
Recently, I was asked a question, how do we get to the middle of the list in an iteration in a separate linked list A …… -
java. Lang. runtimeException: facescontext not found (JSF 1.2 primefaces Tomcat 6)
See English answer > java Lang. runtimeException cannot find facescontext 1 SEVERE: Servlet.service() for servlet j…… -
Java – using runtime getRuntime(). Exec run Excel
try { try { Runtime.getRuntime().exec("excel C:\\file.xls"); } catch (IOException ex) { System.out.println(ex)…… -
How to translate strings using Java?
I want a translation routine that allows me to effectively translate any character into any other character or charact…… -
Java – detects when the user has finished resizing the SWT shell
I have a resizable SWT shell Every time I resize, I have to do something computationally intensive I can register a co…… -
Java – why do the StringBuffer and StringBuilder append methods discard the value returned by the super call
This is a question of curiosity public StringBuilder append(String str) { super.append(str); return this; } Ab…… -
Java scheduled tasks (in Windows)
I have a problem. I want to schedule a specific Java application to run every x days, or every X minutes I really want…… -
MVC pattern in Java swing?
Please give an example of the MVC pattern used in the Java Swing package? Solution Basically, the swing component itse…… -
Java – what are the disadvantages of writing! string. isEmpty()？
In if statements in Java code, I often read if (string! = null & & string. Isempty() = = false) and so on I am…… -
Build a simple GUI using the swing Library in Java 1.6
I'm trying to build a simple GUI using the swing library I don't understand why my table is deleting everything previo…… -
Vcdiff or alternate binary difference format for Java
Is there an open source Java implementation of vcdiff binary differential format (decoder and encoder)? There are xdel…… -
Java – how to perform a series of sorting operations (multiple sorting conditions) on ArrayList
I have an ArrayList of objects on which I want to run a series of sorting operations I want to sort them by name first…… -
Java – a system that players drop (basically gravity)
I'm making a game like Doodle Jump to make your players as high as possible Now I let my player work and move But the …… -
Java – a faster way to batch save using Hibernate?
I have a program that reads text files line by line, creates a hibernate entity object from each line, and saves them …… -
Executing UNIX system commands from Java problems
I encountered a strange problem when executing system commands from Java code Runtime. getRuntime(). exec(“system_prof…… -
Java – questions about polymorphism and overloading
I try to understand the concepts of polymorphism and overloading I have the following code as an experiment However, I…… -
Java – third party object whose design pattern is “toString”
I have a third-party object that uses from Java ToString method inherited from lang.Object This method is useless But …… -
java – super. Problems with paintcomponent (g)
This is a clip: protected void paintComponent(final Graphics g) { Runnable r=new Runnable() { @Override public …… -
Java – the problem of compiling JUnit test classes with ant
I'm working on JUnit with ant build There was a problem integrating XML files My test class is in the same directory a…… -
Java – opengl for space simulator
Together with several friends, we started this Java based project independent of amateur platform for space combat sim…… -
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Java – what’s wrong with my factory?
I have some code like this: public abstract class Foo { public static Foo getFoo() { return new FooImpl();…… -
java：new File(“”,“name”)！= new file(“name”)？ (file constructor with empty string)
We have noticed this today Since there is a file named "existing" in the PWD of java process (Windows) new File("exist…… -
Java – spring promotion_ Required transaction attribute?
In http://www.vermatech.com/code/SpringTransactionExamples.html In the first case study given, testModel.deleteAllCoun…… -
Java Swing: separating UI components from logical behavior – how do you handle this?
What do I do in NetBeans, for example: >Create a UI component class with the suffix swing component type, for examp……