Java 归档 - Page 101 of 655

Java – how do I force MKDIR to overwrite an existing directory?

I need my program to create a directory with a specific name and overwrite any existing directory with that name At pr……

Java

2020-08-27

Java – Android NullPointerException when trying to retrieve data from sqliteopenhelper

When trying to retrieve all SQLite rows from sqliteopenhelper, I encountered the following error in logcat Caused by: ……

Java

2020-08-27

Java – why does 10 > > 2 5 > > 2 evaluate to zero?

Consider the following codes: int a=10,b=5; int c=a>>2+b>>2; System.out.println(c); At run time, the (surp……

Java

2020-08-27

Java – use TreeSet for sorting without providing comparator

I know that TreeSet in Java will automatically sort its elements in ascending order to ensure the order For example, i……

Java

2020-08-27

Java – why does my socks proxy code throw a socketexception: a malformed reply from the SOCKS server?

Why does my socks proxy code throw a socketexception: a malformed reply from the SOCKS server? I tried on urlconnectio……

Java

2020-08-27

Java – spark job server: “the server cannot respond to your request in time”

I'm using spark job server to run spark jobs. It works normally But when I try to do a big job (it takes more than 40 ……

Java

2020-08-27

Use a Java stream to connect the elements of two collections with separators

I have two ways to say: ImmutableSet<String> firstSet = ImmutableSet.of("1","2","3"); ImmutableSet<String>……

Java

2020-08-26

Java – caching nested cacheable operations through spring cache

I was given the task of using spring cache for one of our services to reduce the number of database lookups When testi……

Java

2020-08-26

Java changes the number of worker threads

I'm using executorservice to create a fixed thread pool and start several working threads. These threads listen for wh……

Java

2020-08-26

Java – null and stringutils Differences between isblank()

I want to check whether a string is empty. I want to know which of the following is better, which is better and under ……

Java

2020-08-26

How to use Jackson to serialize / deserialize Java util. stream. Stream？

Suppose I have the following objects public class DataObjectA { private Stream<DataObjectB> dataObjectBStrea……

Java

2020-08-26

java – Play Framework 2.4 Ebean

I was learning how to use ebean orm in the play framework, but I encountered an error Stockitem class: import com.avaj……

Java

2020-08-26

Java – pass the inline constructed class to the method as a class parameter

I need to call the following method void foo(Class<? extends Bar> cls); For the CLS parameter, I need to pass a ……

Java

2020-08-26

Java – the way to invoke Android services in different threads. Is it still running on the main thread?

If I understand correctly, by default, Android services run on the main UI thread However, my problem is that if Servi……

Java

2020-08-26

Multithreading – JavaFX task Updatevalue triggers only the first change event

I want to observe the valueproperty of a task and take action when updatevalue () changes The change event seems to be……

Java

2020-08-26

Java – bitmap font reversal when using assetmanager

Today, I started using assetmanager in libgdx to load my assets Before that, I had loaded everything into a separate c……

Java

2020-08-26

Java – how do I get the next key from a specific key in the map?

I have something similar: Map< Integer,String> topology = new TreeMap< Integer,String>(); These include, f……

Java

2020-08-26

Why is “” marked for Java in sonarqube

In Java, I can convert int to string by "" intvalue Why is this inappropriate As far as I know, integer ToString (intv……

Java

2020-08-26

Java split – wrong length

Why do I receive a length of 3 instead of 4? How can I solve this problem to get the right length? String s="+9851452;……

Java

2020-08-26

JavaFX scrollpane – check the displayed components

I want to know if there is a scrollpane attribute in JavaFX 8 that can be used to listen for components currently disp……

Java

2020-08-26

General functions in Java

I'm not familiar with some general syntax in Java public static<T> T foo(T... a) Can anyone explain its meaning ……

Java

2020-08-26

Java – HashMap that maintains the original key / value when entering duplicate keys

Can HashMap retain its original key / value pair when entering duplicate keys? For example, suppose I have something l……

Java

2020-08-26

Java – what is the difference between using mappartitions and combining broadcast variables and maps in Apache spark

In spark, we use broadcast variables to make each machine read-only copies of variables We usually create a broadcast ……

Java

2020-08-26

Java – exclude packages from gradle dependencies

I encountered a problem that multiple versions of the same class appeared in my classpath The problematic class is jav……

Java

2020-08-26

Java – why not ArrayList < > Add() work?

I'm new to Java. I'm currently using Android studio I just can't understand why Add does not work Topics and jobs are ……

Java

2020-08-26

Java – how to access LinkedList in main from my JFrame button call

:::::: update::::: I tried to update my JFrame to take LinkedList as a parameter. It looks like public userLogin(Linke……

Java

2020-08-26

Java – illegalargumentexception when trying to import xlsx data into R

When importing the xlsx file into R, I faced the following errors – mydata <- read.xlsx("C:\\Users\\aniruddha\\Down……

Java

2020-08-26

How to convert javax xml. datatype. Duration

I have javax from the server xml. datatype. Response in duration format thank you. Solution A simple and direct soluti……

Java

2020-08-26

Java – randomly divide a given number m into N parts

Therefore, the idea I have is to be able to divide $2.00 into 10 people, and each person will receive a random amount ……

Java

2020-08-26

The rcpp function adds the elements of a vector

I have a very long parameter vector (about 4 ^ 10 elements) and an index vector My goal is to add up all the parameter……

Java

2020-08-26

Create a program in Java. If a year is a leap year, return true; otherwise, return false

This is my code public class Leapyear{ public static void main(String []args){ for(int year =2000; year <=202……

Java

2020-08-26

Java – loads the fxml file located in the “SRC” Maven folder

I am developing a JavaFX 8 (Maven) project I want to store the fxml file in the source (not in the resource) folder ne……

Java

2020-08-26

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Java – how do I force MKDIR to overwrite an existing directory?

Java – Android NullPointerException when trying to retrieve data from sqliteopenhelper

Java – why does 10 > > 2 5 > > 2 evaluate to zero?

Java – use TreeSet for sorting without providing comparator

Java – why does my socks proxy code throw a socketexception: a malformed reply from the SOCKS server?

Java – spark job server: “the server cannot respond to your request in time”

Use a Java stream to connect the elements of two collections with separators

Java – caching nested cacheable operations through spring cache

Java changes the number of worker threads

Java – null and stringutils Differences between isblank()

How to use Jackson to serialize / deserialize Java util. stream. Stream？

java – Play Framework 2.4 Ebean

Java – pass the inline constructed class to the method as a class parameter

Java – the way to invoke Android services in different threads. Is it still running on the main thread?

Multithreading – JavaFX task Updatevalue triggers only the first change event

Java – bitmap font reversal when using assetmanager

Java – how do I get the next key from a specific key in the map?

Why is “” marked for Java in sonarqube

Java split – wrong length

JavaFX scrollpane – check the displayed components

General functions in Java

Java – HashMap that maintains the original key / value when entering duplicate keys

Java – what is the difference between using mappartitions and combining broadcast variables and maps in Apache spark

Java – exclude packages from gradle dependencies

Java – why not ArrayList < > Add() work?

Java – how to access LinkedList in main from my JFrame button call

Java – illegalargumentexception when trying to import xlsx data into R

How to convert javax xml. datatype. Duration

Java – randomly divide a given number m into N parts

The rcpp function adds the elements of a vector

Create a program in Java. If a year is a leap year, return true; otherwise, return false

Java – loads the fxml file located in the “SRC” Maven folder

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