包含标签：Java 的文章
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Using objects as keys in Java HashMap
package test; package test; import java.util.HashMap; public class test { public static void main(String args[])…… -
RX Java – retry the same project after the error
I'm trying to build a robust processing pipeline using RX - Java, but I have a problem Here is an example: public stat…… -
Use the or “|” operator on statements in Java
Suppose I have an array a [], if I want to change the value of a [i] and change it to zero, I can do it by using the t…… -
Evaluation order of sub expressions in Java expressions
I have the following code snippets: int x=2,y=3; if ( (y == x++) | (x < ++y) ) // rest of code I know that in C you…… -
Java swing gridbaglayout – add a button without spaces
How to delete the spacing caused by gridbaglayout and make them stick together? import java.awt.BorderLayout; import j…… -
Java – why can’t the final static variable be assigned in the instance block?
class Test { class Test { static final String name; { name = "User"; /* shows error. As …… -
Java sorts a collection of date and time values
I'm using notes Jar Lotus Notes API to extract the date and time of E - mail When I add them to the collection, if I a…… -
Java – webelement or webdriver calls findelement method?
What's the difference if we use webelement or webdriver to call the findelement method? Does each of them have an adva…… -
If the specific conditions are incorrect, I can’t return anything
I'm writing a matrix class. I've written a getnumber method that returns the number in a specific slot in the matrix W…… -
Java – how to use the if else statement returned by the function?
I always try to avoid nested statements They guided me to put the code in curly braces When the amount of code in each…… -
Error passing volatile STD:: queue discard qualifier [- fpermissive] C 98
I have one volatile std::queue<int> requestQueue; When I try to call any of its methods (pop, push, empty, front…… -
Generic – rxkotlin: attempt to add custom error capture
I'm trying to write my own extension function for rxkotlin, which will make observable handle a specific error type (t…… -
Java – is there any other throw role instead of propagating checked exceptions?
After more and more research on the throws statement in exception handling, I am confused I found – class @R_474_2419@…… -
Java – Jackson mapping: deserializing JSON with different attribute names
I have a server that returns JSON strings: {"pId": "ChIJ2Vn0h5wOlR4RsOSteUYYM6g"} Now, I can use Jackson to deserializ…… -
Java class by default, it implicitly extends Java lang.Object
See English answers > java doesn't support multiple inheritance but implicitly every class in Java extends object a…… -
java. Lang.illegalargumentexception: unable to initialize due to invalid key
I received an encryption exception I'm running >OS X 10.11 > java 1.8 > groovy version: 2.4 4 > Gradle 2.3…… -
Java initialization variable increment
Is it risky to initialize a global variable in increments of another global variable? Example: int a=0; int b=a++; i…… -
Implement within the interface – Java
We know that we cannot implement functions in interfaces in Java I just tried public interface InvoiceService { publi…… -
Java – retrieves values from nested JSON arrays in mongodb
My Mongo collection has entries in the following format { "myobj" : { "objList" : [ { "locatio…… -
Java – the difference between using the exception class or FileNotFoundException class to catch exceptions
Just like I have these two scenarios, we must deal with FileNotFoundException Case 1: try { FileInputStream fi…… -
Java gives the wrong answer in computing
I want to do some calculations in Java, I know it's not so bad to do something in more steps, but why use additional t…… -
Multithreading – when using a method in a thread, “the type does not meet the required lifecycle”
I tried to use a method in a thread in rust, but I received the following error message Here is the sample code: use s…… -
Java – setlocation in jlabel
My task is to get the position of the mouse when I click, except for one thing: the position of the output I should ge…… -
Java – connect to AEM 6.0 JCR: precondition failed
I encountered some problems connecting to the JCR repository in AEM 6.0 When I reach the point about creating a sessio…… -
Java – static and non static overloads to each other
Are these two functions overloaded class yogi{ public static void fun(){ System.out.println("Fun"); } …… -
Java – generics and inheritance?
See English answers > java: can't to generic list mylist 4 public static void main(String... args) { List<C…… -
Creating named pipes in Java
I'm trying to create named pipes in Java I'm using Linux However, I encountered a problem writing to the pipeline File…… -
Reducing objects to maps using java 8 streams
If I had a similar course public class Property { private String id; private String key; private String va…… -
Java – first item name of JTable jcombobox error
I added a swing to a JTable JCombo@R_695_2419 @, but the tag of my first project was always javax swing. JCombo@R_695_…… -
Java – rise from preferencearag and preferencefragments using optionsitemselected
I'm having trouble using optionsitemselected when using Android studio's default set activity (extended appcompatprefe…… -
Java – try to draw a circle in libgdx
It's very basic, but I can't figure out what's wrong Basically, I want to draw a circle around an area of one of my ob…… -
How does this java code instantiate an abstract class?
I'm changing our Java class, and I notice the following line of code: OurClass<OurInterface1> ourClass = new Our……