While going through JCIP, I came across the below code snippet which was considered as Immutable. However the explanation provided makes me confused. OneValueCache wouldn’t be immutable without the copyOf calls in the constructor and getter. Arrays.copyOf was added as a convenience in Java 6; clone would also work. Aren’t the state vars of OneValueCache themselves Immutable with final and
Can jOOQ support composite primary keys if auto-increment field isn’t the first one
I’m using jOOQ (3.14.11) to manage a table defined (in H2 or MYSQL) as: Note that in this SQL, the primary key specifies the (group, pawn) IDs in that order but it is the pawn_id, the second one, which is the auto-increment/identity column. It appears that jOOQ doesn’t like this arrangement. When I try to use the Record objects to
How to return a mock response object from HTTP request?
I’m new to Java programming and I have the following snippet on which I want to write unit test: I’m able to create the scenario where HTTP request returns a valid response using the below code: I want to create another scenario where the method call response.readEntity(type) throws an exception. For this, I require that request.get() method returns me a
Code taking forever to excute when turned to string Java? [closed]
Closed. This question needs debugging details. It is not currently accepting answers. Edit the question to include desired behavior, a specific problem or error, and the shortest code necessary to reproduce the problem. This will help others answer the question. Closed 1 year ago. Improve this question When I change the String m1 to a 2D int array it runs
How do I create a new TextView and display it? (with programming)
I’m still new to Android Studio, and for practice I want to make a simple To-Do list app. I’m troubles with creating a new TextView and displaying it. I know that I probably need to manually insert the TextView into the layout, but I have no idea how to do that. Here’s my MainActivity code: I am using ConstraintLayout for
Evaluation order of Java operators && vs ||
I have this simple code block When I run this, the console is This result tell me that only a++ == 10 is evaluated. As I read from this https://docs.oracle.com/javase/tutorial/java/nutsandbolts/operators.html, operator && have higher priority than || and should be evaluated first. In this book OCA Java SE 8 Programmer I Certification Guide, at twist 2.4, a similar example give
remove or not return BufferedOutputStream file in java
i would like not to download the BufferedOutputStream when return java method. my code: my problem is when the invoices has Number it generates invoice and download in compressed zip file. but when it has no Number i dont want to download zip. but still zip file downloads but with empty no file in it. if no pdf generated i
How to Convert Point2D.Double’s to use aritmetic operator >
I have this code: What I wanted to do is use the > arithmetic operation in Point2D.Double object. But as the following error says I cannot use arithmetic operators in Point2D.Double elements. How can I modify my code to work with > operator and other aritmetic operators without changing the input elements of the function getMedianX? Answer The error is
The following error java.lang.NullPointerException is displayed after run the project
Problem: My classes are Hooks for setup and test. I try to click on cookie pop-up, using WebdriverWait, but don’t work. I have no idea why. I am a beginner with selenium and automation testing and I am writing a selenium script using java, TestNG, and maven. When I write everything in one class, all works fine, but I want
Fetching to substring before operator from a dynamic string
I have a string like “name = mita and salary> 10000” . Out of which I need to get only name and salary attribute.I am going to have dynamic string on which i need the attribute before operator only. Like here I need to fetch name and salary attribute which r before = and > operator. I can have multiple