Java
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Why does the java compiler complain that local variables are not initialized here?
int a = 1,b; int a = 1,b; if(a > 0) b = 1; if(a <= 0) b = 2; System.out.println(b); If I run this, I receive: Ex…… -
Java – to in Oracle_ Display time zone description in char()
I have an SQL query select to_char(cast(sysdate as timestamp with LOCAL time zone),'YYYY-MM-DD,HH24:MI:SS TZR') from d…… -
Java – namespace issues
I have the following questions I tried to wrap the code from C to Java COMMON. H namespace rinad { namespace mad_manag…… -
Java – how to split large XML into small pieces using vtdgenhuge?
I want to break the large XML into small pieces I am using vtdgen to split the XML file into small pieces, which is su…… -
Java – add “http: / /” before my address
I extract addresses from a source, but some extracts do not have http: / / addresses in front of them. How can I check…… -
Java – one to many one-way parent-child ID cascade saving
When I try to save the ID from the parent class to the child class, I keep getting errors I tried all types of mapping…… -
Why am I on 1.8 0_ 45, Java Lang. nosuchmethoderror: createimageusingnativesize error
In some cases, the code used to process a single image dragged and dropped from some webrowsers (Firefox) is in 1.8 0_…… -
Java – randomly select a node from the n-ary tree
My node class: import java.util.ArrayList; public class Tree<T> { private Node<T> root; public …… -
How to delete an object from a linked list in Java?
There is a problem in my code. I made a sample program to display the EMP details in the link list. Now the problem wh…… -
Akka distribution pub sub: Java implementation does not work
Subscriber's main class: application java package com.mynamespace; import org.springframework.boot.SpringApplication;…… -
Java – why is this called backtracking?
I read it on Wikipedia and Google it, But I can't figure out what "backtracking algorithm" means I saw this solution i…… -
How do I bind the Java spring time attribute to the thymeleaf field?
I have a problem binding a java time attribute to the thymeleaf field@ H_ 404_ 7@ <input th:field="*{startTime}" ty…… -
How to modify a value in a Java property file
I have a config Properties file, which contains configurable properties, such as database connection details in webapp…… -
The java interface extends the problem
I have to implement an RMI server, which will be the front end of the other two RMI services Therefore, I think it is …… -
Java – sessionexpiredexception occurs when trying to create a post using Google blogger API oauth2
I use the following code to update an existing blog post I received sessionexpiredexception What on earth did I do wro…… -
Java – how do I prevent eclipse from moving my line comments after comments?
I set some comments on the class and comment on the same line as the comments, for example: @SampleAnnotation // sampl…… -
RX Java – with observable Just() and rxjava flatmap with one parameter
I'm using RX Java, and I have a question to understand flatmap Observable.just(1) .flatMap( …… -
java – Android gms：play-services：8.1. 0 DexIndexOverflowException
After I changed GMS: play services: 7.5 0 to 8.1 After 0, the gradle build fails with multiple DEX exceptions The erro…… -
What’s the point of putting parameters before parameters in Java / Android?
What is the difference or meaning of placing the $symbol before any variable or parameter? for example Suppose this is…… -
Java – IllegalStateException: arrayadapter requires the resource ID to be textview
I ran my code once. I ran it again. Now it crashes every time Logcat gave me this: 04-11 03:15:57.293: D/dalvikvm(344)…… -
Java – what is a concurrent language?
From the Java language specification: What is a concurrent language? Solution This means that threads and synchronizat…… -
Java – executorservice seems to run threads on the UI?
Iam tried to use executorservice to run some code to connect my client to the server Obviously Iam tried to make it ru…… -
Assembly – sometimes why do we need to disable interrupts when A20 is enabled?
In some codes of osdev wiki for enabling the A20 line, we have cli interrupt command In others we don't have them For …… -
Java – how to build a jar for a specific operating system using Maven?
I am using Maven for eclipse to build a jar that can run on a remote server My system is running OS X and the server i…… -
Java – spring starts security, and oauth2 logs off to invalidate the session, so as to complete the authentication and approval cycle in the authorization server
I've been following Dave syer tutorial, SSO and oauth2, Part 5 https://github.com/spring-guides/tut-spring-security-an…… -
Java – JWT login process and token validation on the server
What is the correct way to verify tokens on the server? I use the JWT token mechanism in my application, which is how …… -
The Java spring rest API CORS is not applicable to delete requests through jQuery and chrome
I am creating a web front end written in jQuery, which uses the spring framework to send rest requests to rest Web Ser…… -
Java – Jackson @ jsonproperty is invalid if the property name is not equal to the field name
I have the following JSON { "kNown-name": "Zevs","approximate-age": 320 } And binding classes public class GodBindin…… -
How to close well when using the in-process Java RMI registry
case I use the in - process * Java RMI registry in the server process I bind an object in the registry My client proce…… -
Java – how to update the app engine application name when using Google account userservice
I have an existing App Engine (Java) application. We use userservice to authenticate our users' Google account When us…… -
Java – re: YouTube video rating API (V3) works in the simulator, but 403 errors occur in real devices
The client ID and password are correct I rechecked them Google login work, I also get access token, but when I try to ……