What is the best/idiomatic way of performing a null-check before generating a stream? I have a method that receives a List that might be null. So I can’t just call stream() on the value that is passed. Is there some static helper in that would give me an empty stream if a value is null? Answer I agree w…
Android Programmatically open Settings-> Security tab on Button Click
How can I open Android > Settings > Security tab from within my app? In my app, I have one simple button and I want to open the Security tab setting on button click listener event. I have tried to open android settings, but how do I open specifically the security one? Answer Try this instead:
How to set a specific DataSource for a Repository?
Is it possible to assign a specific DataSource to a @Repository? I’d like to create a test environment where in general I want to use the test-datasource, but a few CrudRepository should operate on a different DB (the production DB; read-only operations). Can I tell spring which datasource to use for a …
Byte to “Bit”array
A byte is the smallest numeric datatype java offers but yesterday I came in contact with bytestreams for the first time and at the beginning of every package a marker byte is send which gives further instructions on how to handle the package. Every bit of the byte has a specific meaning so I am in need to ent…
Java JTable getting the data of the selected row
Are there any methods that are used to get the data of the selected row? I just want to simply click a specific row with data on it and click a button that will print the data in the Console. Answer http://docs.oracle.com/javase/7/docs/api/javax/swing/JTable.html You will find these methods in it: Use a mix o…
scrape an angularjs website with java
I need to scrape a website with content ‘inserted’ by Angular. And it needs to be done with java. I have tried Selenium Webdriver (as I have used Selenium before for scraping less dynamic webpages). But I have no idea how to deal with the Angular part. Apart from the script tags in the head sectio…
FTPClient.listFiles is not returning time in seconds
I have written the above function to retrieve the file details. But somehow I am retrieving the details without seconds part of the file. I am retrieving the lastModifiedDate as 2013-08-08 00:00:00 where as its actual lastModifiedDate is 2013-08-08 12:53:27 PM Answer The FTPClient.listFiles uses the ancient L…
Cannot import ksoap2 to Android Studio
I just added ksoap2 (actually it is ksoap2-android-assembly-3.4.0-jar-with-dependencies.jar) to app/libs folder. Also I have used the Project Structure window to add ksoap2 to the Dependencies tab. the Build.Gradle has this section Anyway I cannot import ksoap2 like Any clue? Answer At first, You should remov…
Any way to stream a map like “(k,v)” instead of working with (entry)?
Basically I look for a way to avoid working with and similar to what Map.forEach() does. If only I could get a way to work as map.stream().filter((k,v) -> )… and so on It seems the interface is called BiConsumer. Perhaps with a converter to BiConsumer or a Stream.generate() someway Answer Since this …
How to skip 2 iteration in java loop
I have a loop where single iteration is skipped using continue: Output would be 0 1 3 4 Based on my criteria above like i==2, I want to get output 0 1 4. Meaning I want to skip 2 iterations. How do I do that? Answer Increment i by one inside the if statement.