包含标签：Java 的文章
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Java Swing: add jlabel to JPanel
I just want to add jlabel to the existing JPanel It looks simple. I searched everywhere I think this is right, but the…… -
Java – when using “. Get (0)” in an empty list, I get an out of bounds exception instead of null?
So in my homework, for my error checking test, I made a list < someobject > and I got an indexoutofboundsexcepti…… -
Java – the program does not display the desired string representation of the object
I created a program in Java that should return all orders to the provider This is the procedure: package sakila.ui; i…… -
Java – if you use the Boolean Android statement
I've encountered Boolean problems in if statements all day. Now I'm really bothering me! I've seen other Android threa…… -
Java – displays the password in jpasswordfield instead of setting 0 to echo char
How do I display the text of jpasswordfield instead of setting 0 to echo char? Java docs says: The following results i…… -
Enumerating Java byte types in constructors
public enum Rank { public enum Rank { TEN("Ten",1),NINE("Nine",2),EIGHT("Eight",0),SEVEN("Seven",0); private…… -
Java – how to use the kill – 3 command to dump the Jave heap every 30 seconds
Please help me, I want to run a shell script, which should use the kill - 3 command to dump the Jave heap every 30 sec…… -
Java – why are constructors not inherited?
I've been using eclipse Juno to learn constructors in inheritance When I press Ctrl o twice in childclass, it will dis…… -
Send the file through objectoutputstream and save it in Java?
I have this simple server / client application. I'm trying to let the server send files through OutputStream (fileoutp…… -
Java general conversion, indirect
I find the actors in Java strange. I've never seen them before Test strange things On HashMap: HashMap<String,Objec…… -
Java – thread status exception
When I try to restart my thread, I receive the following error Exception in thread "Thread-1" java.lang.IllegalThreadS…… -
Sleep – JPA dirty check
I know that JPA implementers (such as hibernate) monitor entities attached to the persistence context. If any fields o…… -
Java AWT / swing “include” and “intersect” methods do not work properly
I tried to teach myself some Java AWT and simple graphics, but it was difficult to use the contains and intersects met…… -
Java – do we have all the original types of pools in the permgen area of the heap?
I know the concept of string pool in permgen area of heap So when we do something like this String firstString = "Stac…… -
Hexadecimal enumeration types use java to return wrong values?
I use the following enumeration types in the following code: public static enum PanelType { PAS8((byte)0xA6),PAS83…… -
Concurrent modification exception in Java
See English answers > repeating through a collection, avoiding concurrent modificationexception when removing objec…… -
Java – why can’t the content of my JFrame be displayed correctly?
In order to reduce the code, I am taking out the code irrelevant to the problem, such as addactionlistener(); wait My …… -
Java – change classes and objects (other aproachs?)
I have several situations that I want to do This may be an example: Consider the possible implementation of the chess …… -
Multiple classes and main methods in Java, as well as packages and namespaces
In eclipse The java file name must be the same as the class name Is this true in any case or only in eclipse? For the …… -
Java – GUI does not display as expected
I tried to draw the GUI as shown in the figure, but somehow I couldn't put the object in the correct position (I guess…… -
Java – about the close method used to close the flow ()
Today, when I'm working on some kind of servlet, I'm using the following code to perform a write operation. These serv…… -
Java – defaulttablemodel makes cells non editable JTable
See English answers > how to make a JTable non editable JTable table = new JTable(...){ public boolean isCellEd…… -
Replace dash characters in Java strings
See English answers > java string replace not working 6 str.replace("\u2014",""); Can you help me? Solution String …… -
Java class fields by reference?
I created the following tests to understand how Java handles objects, which puzzled me public class MyClass { publ…… -
Clientprotocolexception when attempting to submit a request to soap wsdlrequest through Java setting user name and password
My goal is to create a soap UI project with a given WSDL URL, save it and send all requests through Java methods I rec…… -
Limit threads and Java concurrency
I can't find an example of this particular case using the latest Java Concurrent routines I plan to use threads to pro…… -
Java – how to convert HTML to 2D arrays
Let me say I copy a complete HTML table (when each TR and TD has additional attributes) For example, for this table: &…… -
Java – no database selected when retrieving from MySQL website
I have a MySQL database and I try to retrieve it from our website host (GoDaddy) I followed a seemingly correct format…… -
Java: how to communicate with multiple clients in a single thread
I have a list of sockets belonging to a single thread But I wonder if there is a feasible way to communicate (read / w…… -
Java – concurrent HashMap document description
Concurrent HashMap is fully interoperable with hashtable in programs that depend on its thread safety but not on its s…… -
Syntax sorting in Java
The following two syntax sequences are valid in Java Why are both allowed and is there a preferred syntax order? priva…… -
Date in constructor in Java
I have a constructor class: ... Date d1; Date d2; public DateClass(Date d1,Date d2) { this.d1 = d1; this.d2 = d2……