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Referencing from an inner class

I have the following code My aim here is to create an array of JTextFields which have a keylistener on. This keylistener should prevent anything other than numbers being entered in the JTextField. It should also change the color of the JTextField’s background if the number entered is not an int. For exa…

How to implemet singleThreaded=true in TestNG

In TestNG i am trying to undertand the use of singleThreaded=true attibute of @Test Annotation .I already referred http://testng.org/doc/documentation-main.html and http://beust.com/weblog2/archives/000407.html but didn’t got much help . My Question : Why do we need to execute method on single thread. R…

How to extract the relative url from the absolute url in Java

I have this website: and I want to extract the relative part out of it: How do I do that? EDIT: I was offered an answer to a question, but the problem there was to build the absolute url out of the relative which is not what I’m interested in. Answer You could use the getPath() method of the URL

Java infinite loop performance

I have a Thread that only has to work when a certain circumstance comes in. Otherwise it just iterates over an empty infinite loop: Does it affect the performance when the loop actually does nothing but it has to check if it has to do the calculation every iteration? Only creating a this Thread when needed is…

RxJava – Just vs From

I’m getting the same output when using Observable.just vs Observable.from in the following case: I thought just was just supposed to emit a single item and from was to emit items in some sort of list. Whats the difference ? I also noted that just and from take only a limited amount of arguments. So Obse…

Restrict JTextField to only accept certain characters

I have 4 JTextFields that should only accept certain characters: binary digits (0, 1) octal digits, so (0 – 7) all digits (0 – 9) all hexadecimal characters (0 – 9, a – f, A – F) The user must not be able to input a forbidden character. I know how I could validate the input after…

How to map java.time.LocalDate field with Orika?

This occurs because LocalDate is not a JavaBean (it has no zero-arg constructor) To fix this, you need to create a LocalDateConverter : and then register it adding this line : As a shorcut, you can instead register the provided “PassThroughConverter” as suggested by Adam Michalik so Orika doesn&#8…