Java 归档 - Page 101 of 655

Java – how to fix com mysql. jdbc. exceptions. jdbc4. Mysqlnontransientconnectionexception: no operation is allowed after the connection is closed Exceptions?

This is a query for my records public void saveTotal(JTextField txtGtotal,JTextField txtPTotal) { try { Re……

Java

2020-08-27

The Java 8 stream aggregates a map

I tried to do something that seemed straightforward, but so far I have no luck I have a list of maps from a bunch of p……

Java

2020-08-27

Java string finder – how do I switch case sensitivity?

I have a method to search the file for the string you give it and return a count But I have a case sensitivity problem……

Java

2020-08-27

Java – missing datasource explorer in eclipse Kepler

I recently downloaded eclipse Kepler Datasource Explorer is missing in this version of Kepler Datasource Explorer can ……

Java

2020-08-27

Java – bitwise OP unexpectedly becomes negative

Can someone explain to me why I got these results? public static int ipv4ToInt(String address) { int result = 0; ……

Java

2020-08-27

Java – changes to Lucene index files during document acquisition / update / deletion?

I'm working on the latest version of Lucene 4.10 2. It combines Java as the front end and Oracle 12C as the database I……

Java

2020-08-27

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

JavaFX: null tableview message

I am developing a java project using eclipse, JavaFX and tableview My application has three languages to choose from. ……

Java

2020-08-26

Is java – volatile propagated to instance members?

Suppose you have some simple container declarations and instantiate them like this class Test { private volatile L……

Java

2020-08-26

JavaFX filteredlist, which filters based on the properties of the items in the list

I have a case where I need to filter an observablelist < item > based on some attributes of the item (that is, t……

Java

2020-08-26

Java – I need to insert randomly generated numbers into the array

I examined these questions carefully with similar words or intentions, but it seems that I can't find any questions th……

Java

2020-08-26

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

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

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

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Java – how to fix com mysql. jdbc. exceptions. jdbc4. Mysqlnontransientconnectionexception: no operation is allowed after the connection is closed Exceptions?

The Java 8 stream aggregates a map

Java string finder – how do I switch case sensitivity?

Java – missing datasource explorer in eclipse Kepler

Java – bitwise OP unexpectedly becomes negative

Java – changes to Lucene index files during document acquisition / update / deletion?

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

JavaFX: null tableview message

Is java – volatile propagated to instance members?

JavaFX filteredlist, which filters based on the properties of the items in the list

Java – I need to insert randomly generated numbers into the array

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

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?

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

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