包含标签：Java 的文章
-
Java – if there is a statement with \ u0026 \ u0026, the first condition needs to be true before testing the second
See English answer > @ L_ 301_ 0 @ 9 From my test, it seems that the if statement will exit [10] before trying to g…… -
Java – AccountManager: invalideauthttoken does not invalidate the token
I tried to get a brand new token from the Google account stored in the Android device, but all the tokens I got were o…… -
Java – why can’t Android os. build. Version resolves to a variable?
I received an error: "android.os.build.version cannot be resolved to a variable" as attached to the line "int myversio…… -
Different icon sizes of the operating system in Java
I just realized that different versions of windows use icons of different sizes for different purposes For example, th…… -
JPA – SQL query using Union and select constants equivalent to SQL query
I wrote an SQL query that basically selects from many tables to determine which tables have rows created since a speci…… -
Rescale vector R
Suppose I have an integer vector, for example: > x [1] 1 1 1 4 4 13 13 14 I'm looking for an effective way to …… -
Java – an example of barrier decomposition
I'm reading the Book Java concurrency in practice, Can someone give an example of how it decomposes the problem into m…… -
Java – use generics to return multiple types
I have this method – public List<Apples> returnFruits(String arg1){ List<Apples> fruits = new ArrayList<…… -
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……