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An interface cannot implement another interface in Java. An interface in Java is essentially a special kind of class. Like classes, the interface contains methods and variables. Unlike classes, interfaces are always completely abstract. An interface is defined just like a class except for the keyword interface in place of a class, the variables are declared in an interface are static and final and the methods are defined in an interface are public abstract methods. An interface can extend any number of interfaces but one interface cannot implement another interface, because if any interface is implemented then its methods must be defined and ... Read More
Yes, we can declare an abstract class with no abstract methods in Java. An abstract class means that hiding the implementation and showing the function definition to the user. An abstract class having both abstract methods and non-abstract methods. For an abstract class, we are not able to create an object directly. But Indirectly we can create an object using the subclass object. A Java abstract class can have instance methods that implement a default behavior. An abstract class can extend only one class or one abstract class at a time. Declaring a class as abstract with no abstract methods means that we don't allow it ... Read More
In this article we are going to learn about execute a script when the element is finished loading in HTML. When an object is loaded, the onload event takes place. Onload is most frequently used in the element to run a script after a web page has loaded all of its content completely. This can be utilised for a number of things, such as checking for cookies or setting the appropriate version of the page based on the user's browser. Let’s dive into the article to understand more about executing a script when the element is finished loading in ... Read More
The HTML DOM Input range disabled property is used for setting or returning if the range slider should be disabled or not. It uses boolean values with true representing the range slider should be disabled and false otherwise. The disabled property is set to false by default. However, the disabled element is greyed out by default and unclickable. Syntax Following is the syntax for − Setting the disabled property − rangeObject.disabled = true|false; Here, true=range slider is disabled and false the range slider is not disabled. It is false by default. Example Let us look at an example for the ... Read More
The HTML DOM contains() method is used to find whether a node is the descendant of the specified node. A descendant can be an immediate child of the node, grandchild and even great-grandchild. It returns a boolean true indicating the node is indeed the descendant of the specified node and false if it isn’t the descendent of the given node. Syntax Following is the syntax for the HTML DOM contains() method − node.contains(givenNode) Here, the givenNode is a mandatory parameter value that specifies if the givenNode is being contained by the node. Example Let us look at an example for ... Read More
To set the coordinates of the area in an image map, Use the cords attribute in HTML to set the coordinates of the area in an image map in HTML.ExampleYou can try to run the following code to implement the cords attribute − HTML coords attribute
In order to change colour of image drawn on an HTML5 Canvas element, you can try to run the following code. Use the drawImage() method − Example: Code to change color of image function display(img1, red, gr, bl) { //func to change color of image var canvas1 = document.createElement('canvas');//canvas element initialisation canvas1.width = img.width;//canvas width initialisation canvas1.height = img.height; //canvas height initialisation var ctx1 = canvas1.getContext('2d'); ctx1.drawImage(img, 0, 0); var myImg =ctx1.getImageData(0, 0, canvas1.width, canvas1.height); for (var t=0;t< myImg.data.length;t+=4) { myImg.data[t]= red | myImg.data[t]; ... Read More
The date picker in HTML5 shows a popup like a calendar. This is the same as selecting the months and years and this adds the date. Example: Style options for HTML date pickerYou can also customize the popup and add background color as well. You can try to run the following code to add style options for HTML date picker − ::-webkit-datetime-edit { padding: 4 em; } ::-webkit-datetime-edit-fields-wrapper { background:blue; } ::-webkit-datetime-edit-text { padding: 0 0.5em; } Editing a month, day and year field The following is to edit a month, day and year field − ::-webkit-datetime-edit-month-field { color: white; } ::-webkit-datetime-edit-day-field { color: red; } ::-webkit-datetime-edit-year-field { color: red; } ::-webkit-calendar-picker-indicator { background:gray; }
SVG stands for Scalable Vector Graphics and is a language for describing 2D-graphics and graphical applications in XML and the XML is then rendered by an SVG viewer. Most of the web browsers can display SVG just like they can display PNG, GIF, and JPG.To draw a polygon in HTML SVG, use the SVG element. The element is to create a shape that consists of straight lines. The points attribute is the x and y coordinates for each corner.ExampleYou can try to run the following code to learn how to draw a polyline in HTML5 SVG: ... Read More
To vertically center a div element for all browsers using CSS, use the Flexbox. CSS3 provides another layout mode Flexible Box, commonly called as Flexbox. Using this mode, you can easily create layouts for complex applications and web pages. Unlike floats, Flexbox layout gives complete control over the direction, alignment, order, size of the boxes. The tag is a container for elements in HTML. We can place any type of content inside the div. The elements are first added and then CSS is used to style them. We can now only center the div vertically, but it can be ... Read More