Java
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java. Lang. IllegalStateException: stream when writing Excel files using jetty and struts as responses
I have a code to create Excel files using struts and jetty In my declared struts In the XML file: <action name="ful…… -
Java: how to deal with generic heterogeneous containers?
What (and why) is a better way to deal with heterogeneous containers (i.e. database cursors with strings, integers, et…… -
java order arraylist string [] by number
I have a list of arrays of type string [] I want to command it with string [0] as int I have this: Collections.sort(li…… -
Java – Android studio Dalvik VM cannot find class
I'm trying to figure out how to fix the errors in the legacy Android projects I've migrated to Android studio I hope t…… -
Java – why string “= =” in equals?
Why does Java compare (this = = another string) in the equalsignorecase method to check that the string is insensitive…… -
Java – remove eclipse symbols
I had these strange symbols one day. I wasn't sure how I got it or how to delete it I really don't know why these are …… -
Java – XPath multi tag selection
For a given XML, how do I use XPath to select C, D, G, H (this will be a child tag in B that is not j)? XML <a> …… -
Java – the data type I should use to map to Boolean values
I want to map the DB column to a Boolean value in hibernate Which data type should I use to map it? tiny int? I'll use…… -
Java – generate client stub from WSDL
I'm starting a new project with a commercial supplier I need to write an integration module in our application to use …… -
Java ternary operator obfuscation
This is my code public class BinarySearch { public static int binsearch(int key,int[] a) { int lo = 0;…… -
Cloning objects in Java
I'm trying to clone dto I have photographed a dto object, as shown in the figure: public class Employee implements Clo…… -
Java – mouselistener / keylistener does not work (JPanel)
I'm working on a small project involving the mouse and key listeners in JPanel Unfortunately, when I use the mouse / k…… -
Java – set the size to TreeSet
Is there any way to provide size limits for treesets in Java collections, just as we do for arrays? anArray = new int[…… -
Another Java generic “incompatible type” compilation error
I was writing some code and encountered incompatible type compilation errors public interface Expression<T> { …… -
Java – BigDecimal number format
BigDecimal val = BigDecimal.valueOf(0.20); BigDecimal val = BigDecimal.valueOf(0.20); System.out.println(a); I want to…… -
Java eclipse Maven version control
Which of the following files should be versioned? Why? >Class files compiled from source code. > Other files gen…… -
Destroy objects in Java
If I set a null object, will Java destroy the original object? For example: Foo f = new Foo(); // ... Foo b = f; If I …… -
String concat speed in Java
I'm rapidly prototyping the SQL query instead of doing it in the right way. I just decided to attack it with a bunch o…… -
Convert Java char in string to lowercase / uppercase
I have a string called "original string", which contains a sentence with a mixture of uppercase and lowercase characte…… -
Java – is this a good if block?
Can these comparisons always safely create nullpointer exceptions? if( myObject == null || myObject.someMethod() == so…… -
How to use the between clause in Kohana ORM
I'm new to Kohana I'm using ORM to get data I want to build a query where the between clause exists as follows SELECT …… -
Java – how do I update jlabel text?
I'm making a hangman game, one of which I want to do is jlabel text, which uses ex. "__" Update, depending on the word…… -
Java – HashMap maps integer arrays by considering their values
Given the following code, I get a null (what I want is "1234") But I hope there is a mapping that can treat the key as…… -
java – Runnable. When can tostring() return duplicate strings?
this. When might tostring() return a duplicate string? public static void main(java.lang.String s[]) { for(int i=0…… -
Java – how to reference a wicket page with parameters
I need to send wicket links (e.g. by email) to reference instances in the system For example, a message might contain:…… -
Java – find the highest n numbers in an infinite list
I was asked this question in a recent Java interview The following is what I have done. If someone can provide a more …… -
Java – how to make Android media player play sound?
I don't know why it doesn't work. There are no recording errors in logcat, but I can't hear the sound public static vo…… -
PowerShell: replacing strings with hash tables
OK, so I set up a hash table whose name is to be replaced and the key is to be replaced, as shown below: $r = @{ "…… -
Java – how to write a method that accepts int variables and returns the maximum value?
I'm trying to write a method to compare three numbers and return the largest number This is my code, but it doesn't wo…… -
Drag and drop – JavaFX: changes the cursor during drag and drop
I want to change the cursor on my node during drag and drop, but the image does not change I call setCursor () in the …… -
Java – try to create a method to check whether the array contains only 1 or 4
static boolean checkNum(int[] array) { static boolean checkNum(int[] array) { boolean bool = true; for (int …… -
Java – using collections Sort()
I have to write a method to sort integers and doubles public ArrayList<Number> sortDescending(ArrayList<Numbe……