Javascript : Get 3 months back date from current

    function fun(){
        var d = new Date(2015,2,25);
        d.setMonth(d.getMonth() - 3);
        alert((d.getDate()+'/'+(d.getMonth()+1))+'/'+d.getFullYear());
    }

Layout Design

Design Pages at online

Java : deepToString()

java.util.Arrays class has many useful methods to perform the operations on the arrays. deepToString() method is one such method. Arrays.deepToString() method is used to get the string representation of multidimensional arrays. This method returns the deep contents of the specified array. If the specified array contains other arrays as it’s elements then it returns the contents of those arrays also.

Below example shows how to use deepToString() method to print the contents of the multidimensional arrays.

OUTPUT:

If you want to print the contents of one dimensional arrays, then use Arrays.toString() method or normal for loop or enhanced for loop. You can also use Arrays.deepToString() method to print the contents of one dimensional arrays. But, If you want to print the contents of multidimensional arrays, instead of nesting multiple for loops, use Arrays.deepToString() method. It is the easiest method to print the contents of multidimensional arrays.

Random Numbers

If you are a software developer, you may have come across the requirement of generating random numbers in your application. While developing any kind of applications, you often need to generate random numbers. In Java, it is easy to generate random numbers using some in-built methods and classes. In this article, we will see three different ways to generate random numbers in java. Let’s start with the definition of random numbers.

What Is Random Number?

“Randomness” is something which is totally unpredictable and unbiased. Random number is a number picked randomly from the given set of numbers. There will be no relation or dependency between the two successively picked numbers.

Random Number Generator :

An ideal Random Number Generator is the one which generates a series of numbers in the given range where,

Each possible number have equal probability of picking up.
There will be no relation or dependency between the previously generated number and the present one.
How To Generate Random Numbers In Java?

Java provides two ways to generate random numbers. One is using java.util.Random class and another one is using Math.random() method. There is one more method introduced in JAVA 7. It is using ThreadLocalRandom class. We will discuss all three methods in this article.

Generating Random Numbers Using java.util.Random Class :

Using java.util.Random class, you can generate random integers, doubles, floats, longs and booleans. Below is the program which generates random integers, doubles and booleans using java.util.Random class.

Output :

Random Integers : 238886529

Random Integers : 1463682739

Random Integers : -1247541726

Random Integers : 34314299

Random Integers : 1658793122

—————————–

Random Doubles : 0.7443798462870127

Random Doubles : 0.8382139571324086

Random Doubles : 0.9680505961503302

Random Doubles : 0.5623901155047567

Random Doubles : 0.37285000690287773

—————————–

Random booleans : false

Random booleans : true

Random booleans : false

Random booleans : false

Random booleans : false

Note : Integers generated are in the range of -231 and 231-1. Generated doubles are in the range from 0.0 to 1.0.

Generating Random Numbers Using Math.random() :

Output :

Random Doubles : 0.7783847001873636

Random Doubles : 0.3895881606319488

Random Doubles : 0.4798586710671108

Random Doubles : 0.6203717760219122

Random Doubles : 0.7460629328768049

Generating Random Numbers Using ThreadLocalRandom Class :

java.util.concurrent.ThreadLocalRandom class is introduced in Java 7. Below program shows how to generate random integers, doubles and booleans using ThreadLocalRandom class.

Output :

Random Integers : -1626309835

Random Integers : 332111237

Random Integers : -1585909207

Random Integers : 1070972416

Random Integers : -1874591696

—————————–

Random Doubles : 0.7840295282815645

Random Doubles : 0.36849802111866514

Random Doubles : 0.6551894273753474

Random Doubles : 0.5993075213578543

Random Doubles : 0.7289343843664791

—————————–

Random booleans : true

Random booleans : false

Random booleans : false

Random booleans : true

Random booleans : true

Generating Random Numbers In The Given Range :

Below is the java program which generates random integers in the range from 0 to 50 using all three methods – Random class, Math.random() and ThreadLocalRandom class.

Output : 

Random integers between 0 and 50 using Random class : 16 12 30 26 17 

Random integers between 0 and 50 using Math.random() : 12 43 42 32 45 

Random integers between 0 and 50 using ThreadLocalRandom 12 40 16 17 3 

How to change localhost domain name

Step 1: 1st open notepad with "Run-AsAdministrator".

Step 2: Open the .file from the following location

              C:\Windows\System32\drivers\etc\hosts.file

Step 3: Coustomize the 127.0.0.1 with your Domain Name, Please follow the following pic for better clarification.

Before Modification:

After Modification:

- By Sai Ram Rajulapati

Reference

http://www.river2c.com/blogs/64/core-java-tutorials-for-beginners/How-to-generate-barcode-for-your-Java-Project

https://www.udemy.com/spring-social-tutorial/?couponCode=LAUNCH7

http://www.river2c.com/blogs/64/core-java-tutorials-for-beginners/How-to-generate-barcode-for-your-Java-Project

http://www.river2c.com/blogs/65/core-java-tutorials-for-beginners/What-is-callback-method-and-how-to-implement-in-Java

My sql practice

http://e.ggtimer.com/

Block UI Demos

Reduce log file size in groovy

Grails : Reduce war file size in deployment

Angular Js Examples

Get Filtered rows in jquery data table

Example for get filtered rows

http://javawithease.com/

http://grails-plugins.github.io/grails-standalone/docs/manual/guide/introduction.html

http://stackoverflow.com/questions/10370711/create-standalone-application-with-grails

RollApp

Free Admin Templates

http://fabien-d.github.io/alertify.js/

http://jsfiddle.net/w5gQS/

http://www.patrick-wied.at/static/watermarkjs/

http://iamceege.github.io/tooltipster/#demos

http://www.opentip.org/

New Things:

http://www.andhrajyothy.com/Artical.aspx?SID=108929&SupID=25

Abount windows 10

Text reader

HashTable

Hashtable stores key/value pairs in a hash table. When using a Hashtable, you specify an object that is used as a key, and the value that you want linked to that key. The key is then hashed, and the resulting hash code is used as the index at which the value is stored within the table.


Hashtable<Integer, String> hashtable = new Hashtable<Integer, String>();

here the key is an integer and value is string datatype.

Ex: hashtable.put(1, "Apple");

similarly,

Hashtable<String, String> hashtable = new Hashtable<String, String>();

Ex: hashtable.put("IN", "INDIA");

here the key and value both are strings.

functions:

hashtable.clear();

it clears the all data with in hashtable.

hashtable.isEmpty();

it returns a boolean value, based on the hashtable is empty or not.

hashtable.size();

it returns how many records are available in hashtable.

hashtable.containsKey("key");

it returns a boolean value. it checks the key is existed or not in hashtable.

hashtable.containsValue("value");

it returns a boolean value. it checks the value is existed or not in hashtable.

hashtable.get("key");

it returns the value based on given key.

hashtable.remove("key");

it removes the record based on given key. it returns the deleted key value.

hashtable.put("key", "value");

it returns the previous value of given key.

hashtable.putAll(treeMap);

it sets all treeMap values to hashtable.

Set<String> set = hashtable.keySet()

it returns the set of keys in hashtable.

Enumeration<String> enumeration = hashtable.keys();

it returns the set of keys in hashtable.



Enjoy and Happy Coding....

what is purpose of treeMap and hashSet

treeMap is sets the data in ascending order.
hashSet didn't allow any duplicates.