How to extract a substring using regex
Assuming you want the part between single quotes, use this regular expression with a Matcher: Example: Result: the data i want
java
What is the use of System.in.read()?
Two and a half years late is better than never, right? int System.in.read() reads the next byte of data from the input stream. But I am sure you already knew that, because it is trivial to look up. So, what you are probably asking is: Why is it declared to return an int when the documentation says that … Read more
Incompatible types List of List and ArrayList of ArrayList
If you had a List<List<Integer>> then you’d be able to add a LinkedList<Integer> to it. But you can’t do this for an ArrayList<ArrayList<Integer>>, so the latter can’t possibly be a type of List<List<Integer>>.
How to check the input is an integer or not in Java?
If you are getting the user input with Scanner, you can do: If you are not, you’ll have to convert it to int and catch a NumberFormatException:
Generate a random double in a range
To generate a random value between rangeMin and rangeMax:
Java syntax explanation – getMenuInflater()
The line getMenuInflater().inflate(R.menu.menu_quiz, menu); is a short form of this:
MultipartException: Current request is not a multipart request
When you are using Postman for multipart request then don’t specify a custom Content-Type in Header. So your Header tab in Postman should be empty. Postman will determine form-data boundary. In Body tab of Postman you should select form-data and select file type. You can find related discussion at https://github.com/postmanlabs/postman-app-support/issues/576
(Java) Tic-Tac-Toe game using 2 dimensional Array
First off: This will create a infinite loop because row and column shouldn’t change you should ask for new input! Also As soon you hit ‘O’ or ‘X’ you will exit the Method with a false (no winner) What you probably want to check is if every spot is occupied This would now check if there is a winner … Read more
Java TreeMap Comparator
You can not sort TreeMap on values. A Red-Black tree based NavigableMap implementation. The map is sorted according to the natural ordering of its keys, or by a Comparator provided at map creation time, depending on which constructor is used You will need to provide comparator for Comparator<? super K> so your comparator should compare on keys. To provide sort on … Read more
An established connection was aborted by the software in your host machine tomcat jackson
Eh… after hours of debugging and thinking – the answer turned out to be the most obvious one – both clients I have been using were closing the connection (probably timeout). It worked in wget and postman while using swagger and advanced rest client caused the exception to be thrown.