Java 归档 - Page 107 of 655

java. Lang. IllegalStateException: commit has been called

I tried the following code, try { final Activity activity = ctx; FragmentTransaction ft = activity.getFragment……

Java

2020-08-26

Java – mybatis uses XML configuration in spring to return large results

I need to dump data from tables in Oracle to elastic search (100 million records), package com.fudy.mapper; import jav……

Java

2020-08-26

Java – null pointer exception error, no obvious code error

I have a mistake here. I don't know where it comes from My java course for beginners is high school, so I don't have m……

Java

2020-08-26

Cannot instantiate a value of type java.util.linkedhashmap from a string value (‘{‘); there is no single string constructor / factory method

I have the following two classes: @JsonIgnoreProperties(ignoreUnkNown = true) public class ChangesJSON { @JsonPro……

Java

2020-08-26

Java – synchronized vs readwritelock performance

I try to prove that synchronized slows down when there are many readers and only a few authors Somehow, I proved the o……

Java

2020-08-26

Alternatives to Java applets

I'm going to write a simple program to graphically display my college students' course prerequisites (i.e. networks as……

Java

2020-08-26

Java – implement equals and hashcode for BST

This problem is a follow-up problem of implementing hashcode for a BST My question was hard to think of, so I got an a……

Java

2020-08-26

JavaFX – how to focus on one phase

My application has a main application stage from which a second window can be opened I just want to focus on one stage……

Java

2020-08-26

Java – how to unit test and simulate methods with files as parameters

I have a collectionobject class to create an ArrayList public class CollectionObject { private List<String>……

Java

2020-08-26

Java – how to determine whether the JRE is 32 / 64 bit from the folder structure / file

I have a JRE folder on windows Is there any way to determine whether the JRE is 32-bit or 64 bit by looking at the int……

Java

2020-08-26

Java – type iterator The next () method returns to the character class

I tried to display the contents of the following HashMap: HashMap<Character,Integer> hm = new HashMap<Charact……

Java

2020-08-26

Java – how do I display an input dialog box with a drop-down list with icons for each item?

I use this java code in my swing application to display an input dialog box with a drop-down selection list so that us……

Java

2020-08-26

Java – how do I ignore spaces in substrings?

I have a text box that makes suggestions based on user input. One of my text boxes is location - based The problem is ……

Java

2020-08-26

Java – how to make textflow optional

I made a textflow because I need to use multiple font poses (I have set the specific "text" to italic or normal) Once ……

Java

2020-08-26

Java EE – reasons for different search results of the same elastic search query on two nodes

I have a two node elastic search setting. The same search query on one node leads to different results from the other ……

Java

2020-08-26

“Error response from daemon: 404 page not found” when using docker command

I encountered an error when I used the docker command Does anyone have a solution? Please help me solve this problem a……

Java

2020-08-26

Multithreading – aborts the entire application from a thread in Delphi

There is a major problem with my Delphi app I'm developing a software that uses external security I am using a USB dev……

Java

2020-08-26

Get the start time of the first 30 days in Java

I tried to get the current date and time for the first 30 days But it's nothing else new Date(System.currentTimeMillis……

Java

2020-08-26

Java hashcode () conflicts for objects that contain different but similar strings

When verifying the output data of the program, I determined that the hash codes of two different objects are the same ……

Java

2020-08-26

Java – spring boot gradle application on heroku: unable to access jarfile

I have a spring boot gradle app that I can run successfully on my computer: heroku local When I go, it can also be suc……

Java

2020-08-26

Multithreading – redis cluster in multithreading

I am currently using the redis cluster mode with three primary instances. I use jedis (Java client) in the listening s……

Java

2020-08-26

Java – why use factories instead of ‘new’?

I'm reading this book EMF: Eclipse modeling framework, which says: Why encourage the use of factories instead of new o……

Java

2020-08-26

Java – symbol error not found in CMD, but not in IDE

I'm trying to compile the following code (I need one of the two files to complete this job), but I encountered 2 error……

Java

2020-08-26

Java – can this loop code be simplified in some way?

I have a problem... Basically my code is ugly and I don't like it I wonder if there is a way to simplify it (I use Jav……

Java

2020-08-26

How do I automatically start rserve from Java?

I write Java applications in the IntelliJ ide The application uses the rserve package to connect to R and perform some……

Java

2020-08-26

Java – in which layer do I access the database in the MVC design

I have a question about database access in MVC applications Where should I put my database access logic? Should it be ……

Java

2020-08-26

Java – invoking methods from generic wildcard references

The following code is simplified to the basic point of the problem: public class GenericTest { private interface ……

Java

2020-08-26

Protected references in Java

See English answers > understanding Java's protected modifier 6 package pac; public class A { protected A a; ……

Java

2020-08-26

Java – singleton vs public static final variable

So I know that the singleton mode is implemented as follows: public class ClassName { private static ClassName ins……

Java

2020-08-26

How to use java to convert UNIX epoch columns to dates in Apache spark dataframe?

I have a JSON data file that contains an attribute [creationdate], which is a UNIX EPOC of "long" numeric type The Apa……

Java

2020-08-26

If Java returns NoSuchElementException

How to create an IF statement to check whether the function returns "NoSuchElementException"? Similar to what I have b……

Java

2020-08-26

Read file into array – Java

I'm practicing Java and watching the exercise online: But I'm in the situation I need Read the file again,and initiali……

Java

2020-08-26

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java. Lang. IllegalStateException: commit has been called

Java – mybatis uses XML configuration in spring to return large results

Java – null pointer exception error, no obvious code error

Cannot instantiate a value of type java.util.linkedhashmap from a string value (‘{‘); there is no single string constructor / factory method

Java – synchronized vs readwritelock performance

Alternatives to Java applets

Java – implement equals and hashcode for BST

JavaFX – how to focus on one phase

Java – how to unit test and simulate methods with files as parameters

Java – how to determine whether the JRE is 32 / 64 bit from the folder structure / file

Java – type iterator The next () method returns to the character class

Java – how do I display an input dialog box with a drop-down list with icons for each item?

Java – how do I ignore spaces in substrings?

Java – how to make textflow optional

Java EE – reasons for different search results of the same elastic search query on two nodes

“Error response from daemon: 404 page not found” when using docker command

Multithreading – aborts the entire application from a thread in Delphi

Get the start time of the first 30 days in Java

Java hashcode () conflicts for objects that contain different but similar strings

Java – spring boot gradle application on heroku: unable to access jarfile

Multithreading – redis cluster in multithreading

Java – why use factories instead of ‘new’?

Java – symbol error not found in CMD, but not in IDE

Java – can this loop code be simplified in some way?

How do I automatically start rserve from Java?

Java – in which layer do I access the database in the MVC design

Java – invoking methods from generic wildcard references

Protected references in Java

Java – singleton vs public static final variable

How to use java to convert UNIX epoch columns to dates in Apache spark dataframe?

If Java returns NoSuchElementException

Read file into array – Java

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