I am having issues with my program printing out only one winner and still allowing the other threads to finish the race while printing their time. When I take out the System.out.println line it messes everything up and I have no idea how and why it is possible. I am using the Runnable and lock statements and …
Tag: java
How to user RecyclerView inside of NavigationDrawer
I want to use a RecyclerView inside of a NavigationDrawer but I’m not sure how to do it. This is what i want to do: I want to have a List inside the Navigation Drawer where you can add entries with a Button/Textfield and delete them by swiping. If there’s a better way to do this then with Navigati…
How to make SWT button Text BOLD
I am creating a checkbox button with text in SWT. In messages.properties, I have the value How can i show the text(ie. Answer) of this button in BOLD? Answer You can convert the currently assigned font for the button to be bold using something like: Note: You must call boldFont.dispose() when you are done wit…
select new (JPQL Constructor Expression) in jpa/hibernate causes “lazy” loading for each row
Recently I found no obvious behaviour when using ‘select new/constructor expression’ in jpa/hibernate. It uses kind of lazy loading for each entity in each row in result set what is not efficient. Test example First case we issue a query using select new technique: This issues one query to fetch o…
How to deal with warning ‘unsafe null type convertion’ when using java.lang.Optional
I would like to offer some accessors to a value-container (that is a java.lang.Map under the hood). When implementing accessors like this … ‘ofNullable’ is marked with ‘unsafe null type convertion’. Why is this? The parameter ofNullable is not marked as @NonNull. Is it, because e…
Variable returns null
In my project ,I need to pass the “price” value which is retrieved from the database in “Availability.java” to “display.jsp”.I have achieved it, but the problem is…. I also need to pass the “price” value from “display.jsp” to “seat.jsp…
How to customize sso(single sign on) by keycloak?
sorry for my poor english… I ‘ll do my best to write question. Basically, keycloak provide loginPage where login form has a some name and value parameter determined by keycloak (forexample session_code, excustion, client_id, tab_id). this way is Server side randering(SSR). However, I want to login…
I can’t store values in the database DAO android
Hi I can’t store values in the database DAO android. I have User.class: DAO database: My Dtababase class is: My code Now my code don’t store new User(i can’t print “ok you are pretty”).Why? I have another question: i know that when you store data in the database you use threads b…
What is the Signature of LocalTime datatype in Java to create objects with it ? int/string cannot be applied to LocalTime Error [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 9 months ago. Improve this question This…
Creating a Map from an Array of int – Operator ‘%’ cannot be applied to ‘java.lang.Object’
I have code like this, which is supposed to create a Map from an array of integers. The key represents the number of digits. The problem is in the line with mapping(). I’m getting an error: Does someone know how to solve this? Answer The flavor of collect() that expects a Collector as an argument isn…