Closing a Scanner throws java.util.NoSuchElementException

When you are reading using Scanner from System.in, you should not close any Scanner instances because closing one will close System.in and when you do the following, NoSuchElementException will be thrown. Scanner sc1 = new Scanner(System.in); String str = sc1.nextLine(); … sc1.close(); … … Scanner sc2 = new Scanner(System.in); String newStr = sc2.nextLine(); // Exception!

How do you make an element “flash” in jQuery

My way is .fadein, .fadeout .fadein, .fadeout …… $(“#someElement”).fadeOut(100).fadeIn(100).fadeOut(100).fadeIn(100); function go1() { $(“#demo1″).fadeOut(100).fadeIn(100).fadeOut(100).fadeIn(100)} function go2() { $(‘#demo2’).delay(100).fadeOut().fadeIn(‘slow’) } #demo1, #demo2 { text-align: center; font-family: Helvetica; background: IndianRed; height: 50px; line-height: 50px; width: 150px; } <script src=”https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js”></script> <button onclick=”go1()”>Click Me</button> <div id=’demo1′>My Element</div> <br> <button onclick=”go2()”>Click Me</button> (from comment) <div id=’demo2′>My Element</div>

Get element type with jQuery

Getting the element type the jQuery way: var elementType = $(this).prev().prop(‘nodeName’); doing the same without jQuery var elementType = this.previousSibling.nodeName; Checking for specific element type: var is_element_input = $(this).prev().is(“input”); //true or false

Numpy ValueError: setting an array element with a sequence. This message may appear without the existing of a sequence?

You’re getting the error message ValueError: setting an array element with a sequence. because you’re trying to set an array element with a sequence. I’m not trying to be cute, there — the error message is trying to tell you exactly what the problem is. Don’t think of it as a cryptic error, it’s simply … Read more

How to get the focused element with jQuery?

// Get the focused element: var $focused = $(‘:focus’); // No jQuery: var focused = document.activeElement; // Does the element have focus: var hasFocus = $(‘foo’).is(‘:focus’); // No jQuery: elem === elem.ownerDocument.activeElement; Which one should you use? quoting the jQuery docs: As with other pseudo-class selectors (those that begin with a “:”), it is recommended … Read more