包含标签：Java 的文章
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How to add a blank page to an existing PDF in Java?
I have ordinary PDF files. I want to use iText library to insert a blank page at the end of the PDF without disturbing…… -
Java – reference two ArrayLists to the same object
I have this code But I don't know how to explain the results: ArrayList<String> first = new ArrayList<String&…… -
Common wildcards in Java generics
Suppose I have an interface interface Foo<T> { void foo(T x); T bar() } And this type of object with …… -
Java – what is an exception control loop?
I'm trying to ask a question in my study guide: I can't decipher the true meaning of this question because I've never …… -
Java – how to programmatically launch Apache Derby jar files?
I have a Java application that uses Apache Derby Using the eclipse export option, I export it as a jar file When I run…… -
Java Object. equals
Can someone tell me why this returns true? Please tell me under which topic I can find more information about this beh…… -
Java file path best practices
If the operating system is windows, which of the following is the best way to write in Java? 1) String f = "some\\path…… -
Java – place JMenu on the MAC menu bar
I am using swing JMenu to create a Java application on Mac I want to use the menu bar at the top of the screen, but it…… -
How to convert bytes in binary representation to ints in Java
I have a string [] with a byte value String[] s = {"110","101","100","11","10","1","0"}; Recycling s, I want to get th…… -
Java – get different JSON representations of the same object
Give a Java object serialized as a JSON string with Jackson Compression: { "a":"123","s":"100" } Or normal: { "alt…… -
java – BorderLayout. Vertical alignment of gridbaglayout panel on Center
What I want to do is to place a gridbaglayout panel in the center of my borderlayout and align the gridbaglayout panel…… -
java. Lang. IllegalStateException: you need to use theme. In this activity Appcompat theme (or descendants)
I received this error while trying to run my Android application Oddly enough: it only happens when Android applicatio…… -
STD:: sum of vector members C
I have sample classes: class Example { private: int testValue1; int testValue2; int testValue3; public: Examp…… -
Java – given a string, does “XYZ” appear in the middle of the string?
My solution works without the second line, except for one condition: if STR = "xYx" is it possible to modify the for l…… -
Java – Abstract generic class
I have the following courses: public abstract class Step { public abstract <S,T> S makeAStep(S currentResult…… -
How do I format a date range in Java?
I have two appointments - start and end I want to format them so that when the month matches, they will crash to a sta…… -
Loading and saving block – based games in Java XML or txt?
I have been making a sim game based on 2D tiles for some time, and everything is going well! Thank you for this websit…… -
Java – what type of encryption does 48 bit to 48 bit use?
I have a stack of 48 bit (6-byte) values and I need symmetric encryption These two requirements are: >The generated…… -
Java – contrary to C, why can’t you reduce method visibility when overriding?
See English answer > java, cannot reduce the visibility of the inherited method from object abstract class A { pr…… -
Java – how do I wait for CSS properties to change?
How do I tell selenium webdriver to wait on a specific element and set a specific attribute in CSS? I want to wait: el…… -
Too many Java – MySQL connections
I hate to ask a question that is widely asked on the Internet, but I can't seem to solve it I started a project after …… -
Java ThreadLocal singleton – what is it?
Laymen say, what does it mean when someone says that an object is a thread singleton in Java? I'm attending a lecture …… -
java – Arrays. Contains (int) error
May I ask why the following output is false? import java.util.Arrays; public class Test2 { public static void m…… -
Java – creating CDATA sections is confusing
I tried to create a CDATA section in the description field, but failed The code is very simple, but there is no CDATA …… -
Java – why does the execution order between printstacktrace () and other methods seem uncertain?
In the following code snippet, the printStackTrace () method is called in the catch block. After running the program, …… -
Java – PowerManager on Android devices WakeLock
I want to implement a wakelock in my Android application I have the following code in oncreat(): pm = (PowerManager) g…… -
Initializes a Java object instance that contains an array of objects
The following code is correct: public Sample mOboeSamples[] = { new Sample(1,1),new Sample(1,2) }; public Sample mGuit…… -
Java – declare int [] array without defining size?
This is my code: int[] primes = new int[25]; for (int i = 2; i <= 100; i++) { for (int j = i; j &g…… -
Is java – x Lang safe?
I often hear this question in discussions with Java developers They (Java developers) always ask if your choice is sec…… -
Java – helps create generic classes to avoid code duplication
I have a simple question. Try to use appengine to keep dry The following two functions are the same except for the obj…… -
Java – when using Grails sortedset, the first () element cannot be accessed from an empty list
I'm trying to dynamically create some Grails domain objects and then add a sortedset declared in another Grails domain…… -
Java – what are JPanel, JFrame, jlayeredpane and jrootpane
I am a novice in Java. When reading, I encountered various frameworks and panels. What is the confusion between JFrame……