I’m trying to add multiple components to a JPanel, but only the most recently added component is displaying. It seems like the problem is that the layout can only handle 1 component at a time, but I’m at a loss as to how to actually fix it. I’ve tried adding the components to a separate pane…
Tag: java
String pattern which starts with # @ and can contain underscore and minus
I try to make a string pattern that can contain UTF-8 characters (öäå, etc) and match the following criteria in Java (1.7); Must start with # or @ Must be lower-case Can contain – or _ (minus and …
Unable to load jdbc driver eclipse
I get the following error while trying to load MySQL Driver: java.lang.ClassNotFoundException: com.mysql.jdbc.Driver at java.net.URLClassLoader$1.run(URLClassLoader.java:202) at java….
How can I read a file containing text and image data?
I’ve got a file with the following structure: For example: I write the example above like this: This works fine. However, I do not know how to read the file. The problem is that I need to call ImageIO.read() to parse the image, but I can’t call it with a BufferedReader. My draft looks like this: S…
Creating a Java Enum in Scala
My workplace has been experimenting in moving from Java to Scala for some tasks, and it works well for what we’re doing. However, some preexisting logging methods expect a java.lang.Enum. The logging method is defined in the (Java) base class, and the subclasses can define their own enums, which the log…
Add context path to Spring Boot application
I am trying to set a Spring Boot applications context root programmatically. The reason for the context root is we want the app to be accessed from localhost:port/{app_name} and have all the controller paths append to it. Here is the application configuration file for the web-app. Here is the index controller…
Removing user login credentials from session when user logout in spring-security
I am new to Spring and Spring-Security. I have been going through the tutorials here The user are not allowed to hit add employee page without login. So if you hit add employee page, you will be directed to the login page and when login succeeded you are directed to the add employee page automatically. But on…
How to assign a text file’s lines of integers into 2D tables in Java?
I have the sample.txt which contains 100 Integers (range 0-9) in every line formatted like this: I want to scan the file and put every line into a 10×10 table. So: Answer How about something like this?
How to run certain task every day at a particular time using ScheduledExecutorService?
I am trying to run a certain task everyday at 5 AM in the morning. So I decided to use ScheduledExecutorService for this but so far I have seen examples which shows how to run task every few minutes. And I am not able to find any example which shows how to run a task every day at a particular
Calling equals on string literal
I just was tidying my code a bit and there was this piece: Then I thought of doing it the other way around to get rid of the checking for null: It definitely works, but is this safe to do so? I mean string literals are stored in a common pool, while string object create by new are on the