Use the @DecimalMin annotation. You will need to pass a literal String value, because the attrubute value must be constant (String.valueOf(- Math.PI)) doesn’t work. It works to validate Double attributes. @DecimalMin(value = “0.01”, message = “Your message…”) private Double longitude;
Something like this? BorderLayout layout = (BorderLayout)panel.getLayout(); panel.remove(layout.getLayoutComponent(BorderLayout.CENTER));
The SVG Parameter Variables Specification would do what you want but it’s unlikely ever to be completed, let alone implemented by UAs. Instead SVG looks like it will move towards attributes being CSS parameters at which point you could use CSS Calc. There is a light at the end of the tunnel for you though … Read more
You can achieve this using a type constructor and something called a “Phantom Type” (read a nice article about this here) which is a technique to ensure that a type can not be assigned to a value directly. Here’s an example of a StringOfLength<Min,Max> type using these techniques: type StringOfLength<Min, Max> = string & { … Read more
You ask, “can’t I switch ALL references of T in this class with ISomething?” So I think you mean to compare: public class MyClass<T> where T : ISomething { public T MyProperty { get; set; } } With: public class MyClass { public ISomething MyProperty { get; set; } } In the second example, MyProperty … Read more
Right, the a = NULL and b = NULL bit was the issue as @a_horse_with_no_name indicated. You might also consider this derivative, which doesn’t require the OR operator: create table test ( id integer primary key, a integer, b integer, check ((a IS NULL) != (b IS NULL)) ); Of course that works exclusively with … Read more
How can I find out that a unique constraint was violated? Exception are chained, you have to call getCause() recursively to get the provider specific exception (and maybe go down to the SQLException) to translate it into something your application can handle nicely for your user. The following will print the chain of exception: for … Read more