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QUESTION
I want to create a class Customer who can be uniquely identified by Customer No.
I wrote the code below
...ANSWER
Answered 2020-Jul-25 at 19:53There is an implicit contract beteween equals(...)
and hashCode()
:
The general contract of
hashCode
is:
Whenever it is invoked on the same object more than once during an execution of a Java application, the
hashCode
method must consistently return the same integer, provided no information used in equals comparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application.If two objects are equal according to the
equals(Object)
method, then calling thehashCode
method on each of the two objects must produce the same integer result.It is not required that if two objects are unequal according to the
equals(java.lang.Object)
method, then calling thehashCode
method on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hash tables.
Your implementation satisfies all three constraints. However, best practice is that all attributes that are compared in equals(...)
should also influence hashCode()
and vice-versa. Otherwise, it might be possible that data structures using hashCode()
(e.g. HahsMap
and HashSet
) can perform sub-optimally. One reason is, as you mentioned, that all objects with the same hashCode
are placed in the same bucket and thus the accesss may not have constant time complexity.
This will not, however, result in exceptions being thrown.
QUESTION
Currently I am trying to use Semantic UI with my react application. It is currently altering the whole applications css. I looked up a solution to do nested scss imports to isolate it to a div. While doing so I get this error:
./src/components/_EmployeeRES.scss (./node_modules/css-loader/dist/cjs.js??ref--6-oneOf-5-1!./node_modules/postcss-loader/src??postcss!./node_modules/resolve-url-loader??ref--6-oneOf-5-3!./node_modules/sass-loader/dist/cjs.js??ref--6-oneOf-5-4!./src/components/_EmployeeRES.scss) Module not found: Can't resolve './semantic-ui-css/semantic.min.css' in 'C:\Users\silve\desktop\Java_Project\my-app\src\components'
Here are the files that I am working with:
_semantic-ui.scss:
...ANSWER
Answered 2020-Mar-09 at 21:40The first issue you're having is because you're not importing the Semantic UI library correctly. It should be:
QUESTION
I make JUnit tests for SpringBoot rest controllers. When i start tests i get the next error:
I suppose it appears because of BookRepository class is autowired into Controller class. Because of legacy i cannot change this Controller class. What i need to do?
In addition this is my test method:
Here are emulation of real code:
...ANSWER
Answered 2018-Oct-04 at 19:32required a bean of type 'ru.arvsoft.server.core.repository.BookRepository' that could not be fou
Thats kid of self explainatory isnt it? Your tested beans requires BookRepository
but you are not creating one in the context (nor mocking it). Add
QUESTION
I have a problem extracting an archive to the desired category using Java 10 ProcessBuilder and 7z.exe (18.05) with command line. The exact same command works as intended when I use Windows CMD, but no longer functions when issued by my JavaFX application using ProcessBuilder:
...ANSWER
Answered 2018-Aug-08 at 21:50Thank you very much for your help.
Don’t quote your arguments. Quotes are for the command shell’s benefit. ProcessBuilder is not a command shell; it executes a command directly, so any quotes are seen as part of the argument itself (that is, the file name). Also, pb.inheritIO(); is a better way to see the output of the child process than manually consuming process streams.
Thank you @VGR it seemed to be the issue - after I remove the method to quote paths in the mentioned command it works like a charm and extracting archive without any problem! So the conclusion is I shouldn't have used quotes in paths while using Java ProcessBuilder.
I've also used pb.inheritIO() and you are right it is much better and easier to manage it this way.
QUESTION
I originally used a library which is located in Central Maven repository. So I just included the dependencies in my pom file in IntelliJ.
Now I need to modify the source code a bit and then I had to re-compile the external library and installed locally into my .m2 repository. In this case, do I need to remove the dependencies section from my Pom in order to use my locally installed jar file which was compiled by myself?
The script to compile and generate the jar file. I run this script which comes with the library source code to compile and install locally.
...ANSWER
Answered 2017-Oct-28 at 05:27I would suggest a better practice as follows along with your work line:
Now I need to modify the source code a bit and then I had to re-compile the external library and installed locally into my .m2 repository.
You must update it version from x.y.z
to x.y.z+1-SNAPSHOT
to mark its change and then publish the artifact. Let's say currently to your local itself.
Note - SNAPSHOT
since this seems to be under development, or else you can mark the change to x.y.z+1
release version as well.
In this case, do I need to remove the dependencies section from my Pom in order to use my locally installed jar file which was compiled by myself?
Now in your original project when you were using the dependency as
QUESTION
As part of our efforts to create a bazel-maven transition interop tool (that creates maven sized jars from more granular sized bazel jars) there is a need to create sources jars.
For java_binary
targets there is a mechanism to create it using -src.jar
suffix
e.g., for a java_binary
target called foo
, run bazel build //:foo-src.jar
But, using the same mechanism for java_library
target named bar
I get:
ERROR: no such target '//:bar-src.jar': target 'bar-src.jar' not declared in package '' (did you mean 'libbar-src.jar'?) defined by /Users/.../java_project/BUILD.
Is there a another mechanism for java_library
?
ANSWER
Answered 2017-Sep-18 at 14:22As indicated by the error, the source target is called //:libbar-src.jar
(with the lib
prefix). See the list of outputs of java_library for reference.
QUESTION
I've added two image views in a stackpane layout that I've created but when I try to add a button node inside my StackPane layout, while the images work just fine, the button doesn't allow the program to run and throws this exception which I cannot figure out:
...ANSWER
Answered 2017-Sep-17 at 12:41You cannot use dash (-) in the id as it means minus operation. Replace it with underscore(_) or use camelCase.
QUESTION
It's been 2 days and I'm pulling my hairs out at this point.
I'm new to java development - trying to get the project imported into intellij IDEA that has following file structure:
ANSWER
Answered 2017-Jun-14 at 21:03Did you try
QUESTION
I am trying to build a maven build and create .war file. it shows the error:
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project EmpReg: Compilation failure: Compilation failure: [ERROR] /E:/Java_Project/EmployeeOnlineRegistrationForm/src/main/java/EmployeeOnlineRegistrationForm/controller/EmployeeRegistrationController.java:[13,47] cannot find symbol [ERROR] symbol: class CrossOrigin [ERROR] location: package org.springframework.web.bind.annotation [ERROR] /E:/Java_Project/EmployeeOnlineRegistrationForm/src/main/java/EmployeeOnlineRegistrationForm/controller/EmployeeRegistrationController.java:[22,2] cannot find symbol [ERROR] symbol: class CrossOrigin
here is my pom.xml:
...ANSWER
Answered 2017-Jan-12 at 06:27I have solved the problem. 1) I have downloaded cors-filter-2.2.1.jar added it. 2) I have added maven dependency in pom.xml :
QUESTION
There is an employee registration from. I have sent the value to controller by ajax calling. Controller has got the value ( I saw the value in debugging) . But when I alert the response in jquery:
...ANSWER
Answered 2017-Jan-03 at 04:49Your response is javascript object. You can not alert object.Access object properties as below:
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