Java 归档 - Page 323 of 655

Java – JPA last update timestamp

I'm playing JPA (eclipse link is specific) The following entities have one What is the policy for automatically updati……

Java

2020-02-10

How do negative operands of bitwise operators work in Java?

-4 & -5 = -8 // How? -4 & -5 = -8 // How? -4 & 5 = 4 // How? I need to explain how to achieve the above re……

Java

2020-02-10

Java – what is the appropriate way to handle warnings: “the expression of X is loaded into X”

I'm not going to close or ignore the expression of type X is boxed into x? Warnings in I wonder if the correct way to ……

Java

2020-02-10

Java – how to prevent hibernate from eagerly obtaining many to one associated objects

I have an attribute in a domain object that is declared in a many - to - one element The basic syntax of this attribut……

Java

2020-02-10

Java – determines whether a file is a connection (in Windows)?

I've been looking for a way to determine whether a file is a connection point, and I haven't found any satisfactory an……

Java

2020-02-10

Java – draw text in JPanel

I'm looking for the most basic description of how to draw text in JPanel I know there are a billion tutorials, but non……

Java

2020-02-10

Java – how do I create a treemultimap from an Iterable / collection?

I'm pruning a tree Multimap and returning the same structured tree Multimap (but pruning) For example, I have differen……

Java

2020-02-10

Is there any way to force a class to use the public static final field in Java?

Is there any way to force classes in Java to have public static final fields (through interfaces or abstract classes)?……

Java

2020-02-10

java – Float vs Double

Is there a case where compare (equals()) between two floating-point values returns false if they are compared to doubl……

Java

2020-02-10

How to create JSON arrays in Java

I have a JSON structure as follows How do I create this array structure programmatically? JSON structure: { "Employee……

Java

2020-02-10

Unit test code and Java 8 Lambdas

I've been using java 8 for several months, and I've started using lambda expressions, which is very convenient in some……

Java

2020-02-10

Java – how to select from HQL

I am a novice to HQL and have an SQL expression that I need to convert, but I cannot select an SQL statement: select S……

Java

2020-02-10

Java – how to install the Tomcat plug-in in eclipse

I use eclipse as my SDK for web project, and I need Tomcat integration with eclipse I'm on my Ubuntu machine How do I ……

Java

2020-02-10

Using multiple consecutive commas to separate strings in Java

See English answers > how to split a comma delimited string into an array of empty strings1 String abc = "a,b,c,d,"……

Java

2020-02-10

Java – image rotation

I tried to rotate the image I use this java code: BufferedImage oldImage = ImageIO.read(new FileInputStream("C:\\works……

Java

2020-02-10

Java – how does this division approximation using displacement operations work?

In Java util. In dualpivotquicksort, the following line of code appears: // Inexpensive approximation of length / 7 in……

Java

2020-02-10

Java Generator for Poisson and Uniform Distributions？

According to my understanding, the standard generator is used for normal distribution I have to generate random number……

Java

2020-02-10

Help is needed to find the vid / PID of the USB driver connected to the system through Java code

I need to find the supplier ID and product ID of the USB driver connected to the system through Java code. Any suggest……

Java

2020-02-10

Java – servlet forward response caller / previous page

I tried to forward the servlet response to the same page it came from (a.k.a: Previous page, or "servlet" caller) I've……

Java

2020-02-10

Java – can I select null as the column value in the HQL query?

I need a list of three columns Columns 1 and 3 have values, while column 2 is empty I need something like this: select……

Java

2020-02-10

Java – compilation failed; For more information, see compiler error output

When I try to compile build XML file, the following error is: BUILD Failed C:\Users\workspace\testrepo\src\build.xml:3……

Java

2020-02-10

Java – change JSP button click

I have a question I have three JSP pages The first is a menu with two buttons When I click the first button, I want to……

Java

2020-02-10

Java – is there any special reason for eclipse generated equals to use the values of 1231 and 1237 as Boolean values?

The title basically explains everything I tried Google search, but returned a lot of false positives I think I just wa……

Java

2020-02-10

Java – are local variables in static methods also static?

I wonder if we declare them statically, all local variables will become static? For example: public static void A(){ ……

Java

2020-02-10

Strange floating point behavior in Java programs

See English answer > is floating point math broken? 29 0.0 + 0.04 = 0.04 0.04 + 0.04 = 0.08 0.08 + 0.04 = 0.12 0.12……

Java

2020-02-10

When reading from a file, Java net. URL cache

It seems that Java is saving some kind of cache for URLs (& files) new java.io.BufferedReader (new java.io.InputSt……

Java

2020-02-10

Java – zoneddatetime as pathvariable in spring rest requestmapping

I have a rest endpoint in my spring application, as shown below @RequestMapping(value="/customer/device/startDate/{sta……

Java

2020-02-10

JDBC batch processing example

Here is the programming house jb51 CC collects and arranges code fragments through the network. Programming house Xiao……

Java

2020-02-09

Java rotates the picture 90 degrees

Here is the programming house jb51 CC collects and arranges code fragments through the network. Programming house Xiao……

Java

2020-02-09

Detailed explanation of the method of reading resources directory file by spring boot

This article mainly introduces the detailed method of reading resources directory files by spring boot. It is introduc……

Java

2020-02-09

Java, tell me what the hell is fail fast

01. Preface What a shame to say: a ten-year it veteran and a Java rookie. Today, I learned that there is a word "fail ……

Java

2020-02-09

Deep understanding of interface and event listener in Java

1： Interface Interfaces are ubiquitous in our life. Through a USB interface, we can transmit data through U disk. Thi……

Java

2020-02-09

搜索内容

Java – JPA last update timestamp

How do negative operands of bitwise operators work in Java?

Java – what is the appropriate way to handle warnings: “the expression of X is loaded into X”

Java – how to prevent hibernate from eagerly obtaining many to one associated objects

Java – determines whether a file is a connection (in Windows)?

Java – draw text in JPanel

Java – how do I create a treemultimap from an Iterable / collection?

Is there any way to force a class to use the public static final field in Java?

java – Float vs Double

How to create JSON arrays in Java

Unit test code and Java 8 Lambdas

Java – how to select from HQL

Java – how to install the Tomcat plug-in in eclipse

Using multiple consecutive commas to separate strings in Java

Java – image rotation

Java – how does this division approximation using displacement operations work?

Java Generator for Poisson and Uniform Distributions？

Help is needed to find the vid / PID of the USB driver connected to the system through Java code

Java – servlet forward response caller / previous page

Java – can I select null as the column value in the HQL query?

Java – compilation failed; For more information, see compiler error output

Java – change JSP button click

Java – is there any special reason for eclipse generated equals to use the values of 1231 and 1237 as Boolean values?

Java – are local variables in static methods also static?

Strange floating point behavior in Java programs

When reading from a file, Java net. URL cache

Java – zoneddatetime as pathvariable in spring rest requestmapping

JDBC batch processing example

Java rotates the picture 90 degrees

Detailed explanation of the method of reading resources directory file by spring boot

Java, tell me what the hell is fail fast

Deep understanding of interface and event listener in Java

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