V Jyothi has Published 119 Answers

What is a marker or tagged interface in Java?

V Jyothi
V Jyothi
Published on 23-Apr-2018 13:22:26
The most common use of extending interfaces occurs when the parent interface does not contain any methods. For example, the MouseListener interface in the java.awt.event package extended java.util.EventListener, which is defined as −Examplepackage java.util; public interface EventListener{ }An interface with no methods in it is referred to as a tagging ... Read More

What are the three usages of the super keyword in Java?

V Jyothi
V Jyothi
Published on 23-Apr-2018 13:13:51
super variable refers immediate parent class instance.super variable can invoke immediate parent class method.super() acts as immediate parent class constructor and should be the first line in child class constructor.

Java multi-line comments

V Jyothi
V Jyothi
Published on 23-Apr-2018 11:05:05
/* is used for multi-line comments.ExampleLive Demopublic class MyFirstJavaProgram {    public static void main(String[] args) {       /* This is an example of multi line comment. */       System.out.println("Hello World");    } }

Java static method

V Jyothi
V Jyothi
Published on 22-Apr-2018 23:24:59
The static keyword is used to create methods that will exist independently of any instances created for the class.Static methods do not use any instance variables of any object of the class they are defined in. Static methods take all the data from parameters and compute something from those parameters, ... Read More

Java static block

V Jyothi
V Jyothi
Published on 22-Apr-2018 23:20:48
static keyword can be used to create a block to be used to initialize static variables. This static block executes when classloader loads the class. A static block is invoked before main() method. You can verify the same using.ExampleLive Demopublic class Tester {    static {       System.out.println("In static ... Read More

StringTokenizer class in Java

V Jyothi
V Jyothi
Published on 22-Apr-2018 22:58:34
The StringTokenizer class of the java.util package allows an application to break a string into tokens.This class is a legacy class that is retained for compatibility reasons although its use is discouraged in new code.Its methods do not distinguish among identifiers, numbers, and quoted strings.This class methods do not even ... Read More

Fibonacci series program in Java using recursion.

V Jyothi
V Jyothi
Published on 22-Apr-2018 22:41:48
Following is the required program.ExampleLive Demopublic class Tester {    static int n1 = 0, n2 = 1, n3 = 0;    static void fibbonacci(int count) {       if (count > 0) {          n3 = n1 + n2;          n1 = ... Read More

Prime number program in Java.

V Jyothi
V Jyothi
Published on 22-Apr-2018 22:32:28
Following is the required program.ExampleLive Demopublic class Tester {    public static void main(String args[]) {       int i, m = 0, flag = 0;       int n = 41;// it is the number to be checked       m = n / 2;   ... Read More

How to extend an existing JavaScript array with another array?

V Jyothi
V Jyothi
Published on 22-Apr-2018 22:22:16
To extend an existing array in JavaScript, use the Array.concat() method.ExampleYou can try to run the following code to extend an existing JavaScript array with another array:Live Demo<html>        <head>             <title>JavaScript Array push Method</title>        </head>         ... Read More

What is the difference between parseInt(string) and Number(string) in JavaScript?

V Jyothi
V Jyothi
Published on 22-Apr-2018 22:03:37
parseInt(string)The parseInt() method parses up to the first non-digit and returns the parsed value.  For example, the following returns 765:parseInt("765world")Let’s take another example. The following returns 50:parseInt(‘50px”);Number(string)Number() converts the string into a number, which can also be a float BTW.For example, the following returns NaN:Number(“765world”)The following returns NaN:Number(“50px”);Read More
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