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In Java you can declare three types of variables namely, instance variables, static variables and, local variables.Local variables − Variables defined inside methods, constructors or blocks are called local variables. The variable will be declared and initialized within the method and the variable will be destroyed when the method has completed.Instance variables − Instance variables are variables within a class but outside any method. These variables are initialized when the class is instantiated. Instance variables can be accessed from inside any method, constructor or blocks of that particular class.Class (static) variables − Class variables are variables declared within a class, ... Read More
Static variables − Static variables are also known as class variables. You can declare a variable static using the keyword. Once you declare a variable static there would only be one copy of it in the class, regardless of how many objects are created from it.public static int num = 39;Instance variables − These variables belong to the instances (objects) of a class. These are declared within a class but outside methods. These are initialized when the class is instantiated. They can be accessed from any method, constructor or blocks of that particular class.You must access instance variables using an ... Read More
Enumeration (enum) in Java is a datatype which stores a set of constant values. You can use enumerations to store fixed values such as days in a week, months in a year etc.You can define an enumeration using the keyword enum followed by the name of the enumeration as −enum Days { SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY }Methods and variables in an enumerationEnumerations are similar to classes and, you can have variables, methods (Only concrete methods) and constructors within them.For suppose we have elements in an enumeration with values as −enum Scoters { ACTIVA125(80000), ACTIVA5G(70000), ACCESS125(75000), ... Read More
An exception is an issue (run time error) occurred during the execution of a program. When an exception occurred the program gets terminated abruptly and, the code past the line that generated the exception never gets executed.Exampleimport java.util.Scanner; public class ExceptionExample { public static void main(String args[]) { Scanner sc = new Scanner(System.in); System.out.println("Enter first number: "); int a = sc.nextInt(); System.out.println("Enter second number: "); int b = sc.nextInt(); int c = a/b; System.out.println("The result is: "+c); ... Read More
An exception is an issue (run time error) occurred during the execution of a program. When an exception occurred the program gets terminated abruptly and, the code past the line that generated the exception never gets executed.Exampleimport java.util.Scanner; public class ExceptionExample { public static void main(String args[]) { Scanner sc = new Scanner(System.in); System.out.println("Enter first number: "); int a = sc.nextInt(); System.out.println("Enter second number: "); int b = sc.nextInt(); int c = a/b; System.out.println("The result is: "+c); ... Read More
While reading the contents of a file in certain scenarios the end of the file will be reached in such scenarios a EOFException is thrown.Especially, this exception is thrown while reading data using the Input stream objects. In other scenarios a specific value will be thrown when the end of file reached.In the DataInputStream class, it provides various methods such as readboolean(), readByte(), readChar() etc.. to read primitive values. While reading data from a file using these methods when the end of file is reached an EOFException is thrown.ExampleFollowing program demonstrates how to handle the EOFException in Java.import java.io.DataInputStream; import ... Read More
In this article, we will see how to extract details about Youtube videos and download them in different formats using the pafy module. Head over to the link for official documentation.Install the pafy module using the following commandpip install pafyIf you run the above command, it will generate the following results on the successful installation of the module pafy.Collecting pafy Using cached https://files.pythonhosted.org/packages/b0/e8/3516f761558525b00d3eaf73744eed5c267db 20650b7b660674547e3e506/pafy-0.5.4-py2.py3-none-any.whl Installing collected packages: pafy Successfully installed pafy-0.5.4Check whether you can import the pafy module or not by running the following command.import pafyIf you found no errors then it's done. Otherwise install the following module to solve ... Read More
Use Inline List Items to build a horizontal navigation bar. Set the elements as inline.ExampleYou can try to run the following code to create horizontal navigation bar:Live Demo ul { list-style-type: none; margin: 0; padding: 0; } .active { background-color: #4CAF50; color: white; } li { border-bottom: 1px solid #555; display: inline; } Home Company Product Services Contact
Use the bottom CSS property to add arrow to the top of the tooltip.ExampleYou can try to run the following code to add a tooltip with arrow to the top:Live Demo .mytooltip .mytext { visibility: hidden; width: 140px; background-color: blue; color: #fff; z-index: 1; top: 150%; left: 50%; margin-left: -60px; text-align: center; border-radius: 6px; padding: 5px 0; position: absolute; } .mytooltip { position: relative; display: inline-block; } .mytooltip .mytext:after { content: ""; position: absolute; bottom: 100%; left: 50%; margin-left: -10px; border-width: 3px; border-style: solid; border-color: transparent transparent blue transparent; } .mytooltip:hover .mytext { visibility: visible; } Keep mouse cursor over me My Tooltip text
To add rounded corners to a button, use the border-radius property.ExampleYou can try to run the following code to add rounded corners −Live Demo .button { background-color: yellow; color: black; text-align: center; font-size: 15px; padding: 20px; border-radius: 15px; } Result Click below for result: Result