包含标签：Java 的文章
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How to use Qt5 to realize multithreading (I)
#include "thread_one.h" thread_one::thread_one(QObject *parent) : QThread(parent) { } void thread_one::run() { …… -
The value of Java jsonobject array is key
I'm new to Java, so it's a little confusing I want to get a string in JSON format What I want is { "user": [ "name","l…… -
Java hashcode() string conflict
I know little about hash codes I found that this code can print out collisions Can you tell me what collision is and h…… -
Java – allocate memory using thread
I wonder what happens if a local thread is declared in a method? Usually, after the function returns, all local variab…… -
How to solve this Java lang.ClassCastException：org. apache. tomcat. dbcp. dbcp. Basicdatasource cannot be cast to org apache. tomcat. jdbc. pool. DataSource？
I tried to use pool for database connection in Tomcat. This is my context: <Resource name="jdbc/slingemp" auth="Con…… -
Java – read from InputStream and write to OutputStream
This should be very simple. I searched Google, but I didn't see anyone mention the problems I noticed Everything I've …… -
Java – use “this” in another constructor
Suppose you have a class with this constructor: public SomeObj(int x,int y) { this.x = x; this.y = y; } Everyt…… -
Java – find unpaired numbers in an array
I have an array that repeats all elements except one: int[] a={2,6,2,4,1,4}; How do I find unpaired element integers? …… -
IO stream technology
Create and delete files: createnewfile(), delete() Create folders: mkdir() and mkdirs() List next level: lists the sub…… -
Java – \ u0026 \ u0026 operator problem
In the following code & & the syntax error is given in the if else statement. I'm not sure how to solve it Can…… -
Java – 2D ArrayList
This is just a very small problem... I seem to have encountered too many complex problems: I have to implement an inde…… -
Use the string comparison in Java again
Novice problem, but I have this Code: import java.util.*; import java.io.*; public class Welcome1 { // main meth…… -
How to handle Boolean values in Java through bitwise operators
Consider this example int i=11,j=5; boolean b=true,c=false; System.out.println(b&c); // --> output=false System…… -
AWT or swing for Java for GUI building?
I need to form a fairly simple GUI for the server monitoring process It will have tabs that can cause log tailing, res…… -
Java 8: changing the value of the entryset stream
I have the following settings: My problem is that strings as project map values are marked with tags I want getitems (…… -
How do I return flags and optional messages in Java?
I want to write a method in Java to verify whether some data exists for some conditions, confirm that the data is vali…… -
Java – byte constructor and byte Differences between valueof () methods
Byte byte1=new Byte("10"); Byte byte1=new Byte("10"); Byte byte2=Byte.valueOf("10"); System.out.println(byte1); Syste…… -
Java – using transformers. Java in Hibernate Aliastobean populates sub beans
I have the following beans: Address { String name; String number; String zipcode; String town; } MyEn…… -
java – @Override on Implementation
Will you put comments in the implementation class methods? Is it useful? If you input wrong or no input, it is a compi…… -
Java of jar file
I created a Java application and packaged it into a jar file on the windows platform Now I want to deploy the jar file…… -
Is this statement correct in Java?
I want to use datagram socket to transfer data between two computers I use the following lines: host=InetAddress.getBy…… -
Java – why is this non greedy regular expression more than I want?
I think it should return to "state, country", but it is returning to "country" System.out.println("city,state,country"…… -
Java: trying to get the percentage of integers, how to sort it out?
I have two integer values, X and the sum I tried to find the percentage of total X That's what I'm doing now: Percenta…… -
java – Math. How does random () generate random numbers beyond the “native” range?
As far as I know, math Random () itself generates random doubles between 0.0 and 1.0, including 0.0 but not 1.0 I also…… -
Java – exception: add a window to the container How?
I have a jdialog class called preferences This class creates a constructor, such as: class Preferences extends javax.s…… -
JavaFX Maven plug-in and API are incompatible
I recently upgraded my java version to 7u40. 0 on my Fedora 19 Then I started to make a nasty mistake in the JavaFX pr…… -
Java thread pool
I want to learn how to write a thread pool in Java Can anyone point out my useful resources? Solution You can view the…… -
Is there any way to make the constructor return a = = null object in Java?
I have a feeling that the answer is "no", but I think I'll ask just in case Pseudo code: Foo foo = new Foo(); if(foo …… -
How to modify the final StringBuffer value after creation in Java?
I know the final variable characteristics It cannot change from its initialization state however How is StringBuffer d…… -
Java – why do we have to declare dependencies on the JBoss 8 (wildfly) manifest?
The following ear is given: > my-app. ear > my-ejb. jar > my-webapp. war > lib > my-lib. jar My EJB nee…… -
A list of all binary combinations of numbers in Java
I'm working on a project involving "dynamic programming". I'm shocked by this trivial thing. Please help Suppose I tak…… -
Java integer ArrayList returns elements in a specific range
I have an integer Java ArrayList ArrayList <Integer> ageList = new ArrayList <Integer>(); I have some int……