Syed Javed has Published 53 Answers

How to access methods of an array of objects in JavaScript?

Syed Javed
Syed Javed
Published on 22-Apr-2018 17:57:14
To access methods of an array of objects in JavaScript, you can try to run the following code, wherein the method is accessed:ExampleLive Demo<html>        <head>             <title>JavaScript Array join Method</title>        </head>            <body>     ... Read More

How to add new array elements at the beginning of an array in JavaScript?

Syed Javed
Syed Javed
Published on 22-Apr-2018 17:54:07
JavaScript array unshift() method adds one or more elements to the beginning of an array and returns the new length of the array.ExampleYou can try to run the following code to learn how to add new array elements at the beginning of an array:Live Demo<html>        <head>   ... Read More

How to compare arrays in JavaScript?

Syed Javed
Syed Javed
Published on 22-Apr-2018 17:51:31
To compare arrays in JavaScript, try to run the following code. The matched elements from both the arrays get displayed here:ExampleLive Demo<html>        <body>                   <script>                          var arr1 ... Read More

What is an array in Java?

Syed Javed
Syed Javed
Published on 22-Apr-2018 17:45:43
An array is a data structure/container/object that stores a fixed-size sequential collection of elements of the same type. The size/length of the array is determined at the time of creation. The position of the elements in the array is called as index or subscript. The first element of the array ... Read More

Can a method have the same name as the class?

Syed Javed
Syed Javed
Published on 22-Apr-2018 17:42:00
Yes, you can write a method in Java with method name same as class name. But it is not suggestable because of the following reasons − Using upper case letter at the starting of the name of the method violates the coding conventions of Java for writing a methods ... Read More

What is the character wrapper class and its methods in Java?

Syed Javed
Syed Javed
Published on 22-Apr-2018 17:37:18
The Character class of the java.lang package wraps a value of the primitive datatype char. It offers a number of useful class (i.e., static) methods for manipulating characters. You can create a Character object with the Character constructor. Character ch = new Character('a'); Following are the notable methods ... Read More

What is the object class in Java?

Syed Javed
Syed Javed
Published on 22-Apr-2018 17:21:40
The java.lang.Object class is the root of the class hierarchy. Every class has Object as a superclass. All objects, including arrays, implement the methods of this class. Example Following example demonstrates the usage of the Object class. Here we are getting the name of the current class using the getClass() ... Read More

What are the properties of an array object in JavaScript?

Syed Javed
Syed Javed
Published on 18-Feb-2018 05:58:48
The Array object lets you store multiple values in a single variable. It stores a fixed-size sequential collection of elements of the same type.The following is the list of the properties of the Array object −Sr.NoProperty & Description1constructorReturns a reference to the array function that created the object.2indexThe property represents ... Read More

How to create an array of integers in JavaScript?

Syed Javed
Syed Javed
Published on 18-Feb-2018 05:24:27
To create an array of integers in JavaScript, try the following −var rank = [1, 2, 3, 4];You can also use the new keyword to create array of integers in JavaScript −var rank = new Array(1, 2, 3, 4);The Array parameter is a list of strings or integers. When you specify ... Read More

How can we set PRIMARY KEY on multiple columns of an existing MySQL table?

Syed Javed
Syed Javed
Published on 18-Feb-2018 04:20:44
We can set PRIMARY KEY constraint on multiple columns of an existing table by using ADD keyword along with ALTER TABLE statement.ExampleSuppose we have a table ‘Room_allotment’ as follows −mysql> Create table Room_allotment(Id Int, Name Varchar(20), RoomNo Int); Query OK, 0 rows affected (0.20 sec) mysql> Describe Room_allotment; +--------+-------------+------+-----+---------+-------+ ... Read More
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