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Java Discover is a Java technical blog mainly created for sharing our thoughts and programming question to the world of Java Programmers..

Creating Captcha using Java

Core Java 10 Comments

In this tutorial we will see how to create Captcha using Java code and to validate through JSP. In recent days we will be seeing in most of the websites are using Captcha for...

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@PropertySource @Value Abstract Class Add two numbers represented by linked lists using recursive Addition of 2 Linked List Advanced Encryption Standard AES AES algorithm Algorithm amazon interview questions Anagrams Apache POI Array Array rotate ArrayList Autoboxing Binary Search Binary Search Tree Binary Search Tree Height Binary Tree Binary Tree Lead node Binary Tree size BIOS boxing BST BST maximum height Bubble sort Cache caching in java Calendar Callable Captcha Case Insensitive HashMap Change File Modified Date and Time in Java Change File Permission Character Character Occurrences Character to String Checked Exception Checking Pangram or Not Class.forName ClassNotFoundException Clone() Clustering collect Collections collectors Comparable Comparator Concatenate List Concrete methods Condition Constructor Injection Consumer Interface Convert Date/Time for given Timezone - java Convert JSON to Java Object using Google Gson library Core Java count Count Duplicate elements in an array Count set bits in an integer Counting nodes in a tree? Yes how to get Binary Tree size Covariant Create Binary Tree Create singly linkedlist Custom Annotation with Example Custom Object Daemon Thread Data Structure DataTable Date and Time Decoding Decryption Deep copy delete node Dependency Injection Design Pattern Diameter of a Binary Tree Difference between IdentityHashMap and HashMap DNSJava Do you know DOM and SAX Parser Domain Name lookup Drive Details duplicate element Dynamic clustering Dynamic Programming Dynamic Programming - Find nth Fibonacci numberm Dynamic Programming Dynamic scaling Eclipse shortcuts Email Encoding Encryption entrySet() Enum.ordinal() Method in Java Enumeration Enumeration in java Environment equals equals() method Error Even Odd Numbers Excel Sheet Exception exception handling in JSP executable jar Executor framework ExecutorService External Iterator facebook interview questions Factory class Factory Pattern File File search Filter final finalize Finally Find loop in linkedlist Find next greater number with same set of digits Find Nth node Find the middle of a given linked list Find the Occurrences Of Each Character In a String Find the smallest window in a string containing all characters of another string (With smallest window) Finding Minimum Distinct Ids finding missing number in an array Finonacci Folder search Future Generics Google GSON google interview questions Google Maps API graph creation Grayscale Grayscale image hashcode HashMap Hashtable Hazelcast Heap Hibernate Hotspot JVM Options How to concatenate 2 List in Java How to create a graph using Java How to create simple and easy singly LinkedList in Java How to delete a Node from Linked List in java How to Design a simple LRU cache in Java How to detect loop in a linked list or not How to do Iterative Postorder Traversal in BST How to do Level order traversal in Binary Search Tree How to do simple matrix multiplication How to find integer pairs with given sum How to find pairs of number to get magic sum How to find the largest subarray with sum 0 How to get all Java TimeZone ID's How to get height of BST using recursive way How to get integer pairs with given sum from integer array How to get Maximum Subarray Sum in optimal way how to get only left child in BST How to Iterate Map key and value How to print singly linked list in reverse order How to reverse a number using stack? How to reverse a String without special characters IdentityHashMap Image Image border Image resizing immutable class Implement Stack in Java Implementing Queue in Java Inorder Inorder Predecessor and Successor of Binary Search Tree Insertion sort Interface Interface default method in Java 8 Interface extends another interface Interface extends another interface in Java Internal Iterator Interview Questions Inversion of Control Invert bits of a number IP Iterator Iterator Design Pattern JAR Java 7 Java 8 Java 8 - ForEach loop Java 8 - Stream and Filter Java 8 - StringJoiner with examples Java 8 API Java Interview Questions Java Memory Java Object to JSON Java Properties Java RegEx Java Timer java.sql.Date java.sql.Timestamp java.util.Date JAX-RS JAX-WS JDBC example JdbcDaoSupport JDBCTemplate join() jQuery jQuery notify JSON Date Format JSON to Java Object JsonSerializer JSP JSP Custom error page keySet() Lambda Expression LCS Least Recently Used Cache Leetcode: 463. Island Perimeter left nodes Level order traversal Linked List LinkedHashMap LinkedHashSet LinkedList List ListIterator Locale Log4j log4j API Log4j Appender Login Page Longest Common Subsequence Longest Common Subsequence (LCS) algorithm using Dynamic Programming in java Longest palindrome Sub-sequence Longest Substring without duplicate character loop LRU Mail API MailSender Marker Interface Matcher Maximum sub array Merge 2 Sorted Linked Lists merge List Method Reference middle node Mirroring Binary Tree Morgan Stanley Interview questions Multiply 2 numbers using recursion Multiply without * operator Multithreading in java Mutable Objects MySQL MySql commands and query MySQL import and export commands MySql Timewait mysqldump N'th node from the end of a Linked List next greater number NoClassDefFoundError notify() notifyAll() Object class Object reference by value Object Sorting ObjectInputStream ObjectOutputStream Odd even using ReentrantLock and Condition OS Details Pair of given sum Pangram Pangram or not Pass by reference Pass by value Pattern Patterns Permutation PID Postorder Pre-Authentication Predecessor Predecessor and Successor Preorder Print all leaf nodes of a Binary Tree from left to right Print all pairs with given sum Printing ODD EVEN PriorityBlockingQueue PriorityQueue Process QR Code Queue Quicksort read Object from file Read web page recursion ReentrantLock ReentrantLock and Condition Reflection Regular Expression Regular Expressions Remove all consecutive duplicates from the string Remove duplicate remove null from List RESTFull Reverse Linked List Reverse LinkedList Reverse number using Stack Reverse words in a given string Reverse words in a given String using recursion Rotate array by N elements rotate matrix Rotate matrix by clockwise Runnable scale-able data distribution platform Scanner class Segregate 0s and 1s in an array by looping only once Selection sort Semaphore sending email sending email using embedded image Separate Logger for specific classes or package Serializable Serialization Serve static resources from different locations using spring Setter Injection Shallow copy Simple SimpleDateFormat Smallest substring which contains all characters of other String Smallest window Smallest window with all characters of other string SMS SOAP Sorting Sorting array without loop Sorting Hashmap sorting hashmap based on values Sorting HashMap by Values including duplicate in Java Sorting Integer array without any sorting algorithm or loop Split the array into two equal Sum subarrays Split() Spring Spring Boot Spring Data Access Spring DataSoruce Spring IOC spring JDBC Spring Resource Loader Spring Security Spring with hibernate Stack Stack using Linked List Static Vs Volatile Stream API Streams String String Permutation using Recursion String Replace String Reverse String.join StringBuffer StringBuilder StringJoiner StringTokenizer subarray with sum 0 Successor synchronization Synchronized Map Tag Interface Thread pool ThreadLocal Threads Throw Throws TimeZone Traversal traverse the linked list only once to get middle node TreeMap TreeSet try catch Try-with-Resources Unboxing Unchecked Exception Unix commands user defined exception user defined Immutable Class values() Variable arity Vector Volatile wait() Web Services What are the Java TimeZone ID's words reverse Wrapper Classes write object to file XML XOR ZIP

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Abstract Class
Add two numbers represented by linked lists using recursive
Addition of 2 Linked List
Advanced Encryption Standard
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AES algorithm
Algorithm
amazon interview questions
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Array
Array rotate
ArrayList
Autoboxing
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boxing
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Convert JSON to Java Object using Google Gson library
Core Java
count
Count Duplicate elements in an array
Count set bits in an integer
Counting nodes in a tree? Yes how to get Binary Tree size
Covariant
Create Binary Tree
Create singly linkedlist
Custom Annotation with Example
Custom Object
Daemon Thread
Data Structure
DataTable
Date and Time
Decoding
Decryption
Deep copy
delete node
Dependency Injection
Design Pattern
Diameter of a Binary Tree
Difference between IdentityHashMap and HashMap
DNSJava
Do you know
DOM and SAX Parser
Domain Name lookup
Drive Details
duplicate element
Dynamic clustering
Dynamic Programming
Dynamic Programming - Find nth Fibonacci numberm Dynamic Programming
Dynamic scaling
Eclipse shortcuts
Email
Encoding
Encryption
entrySet()
Enum.ordinal() Method in Java
Enumeration
Enumeration in java
Environment
equals
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Error
Even Odd Numbers
Excel Sheet
Exception
exception handling in JSP
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facebook interview questions
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Factory Pattern
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File search
Filter
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finalize
Finally
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Find next greater number with same set of digits
Find Nth node
Find the middle of a given linked list
Find the Occurrences Of Each Character In a String
Find the smallest window in a string containing all characters of another string (With smallest window)
Finding Minimum Distinct Ids
finding missing number in an array
Finonacci
Folder search
Future
Generics
Google GSON
google interview questions
Google Maps API
graph creation
Grayscale
Grayscale image
hashcode
HashMap
Hashtable
Hazelcast
Heap
Hibernate
Hotspot JVM Options
How to concatenate 2 List in Java
How to create a graph using Java
How to create simple and easy singly LinkedList in Java
How to delete a Node from Linked List in java
How to Design a simple LRU cache in Java
How to detect loop in a linked list or not
How to do Iterative Postorder Traversal in BST
How to do Level order traversal in Binary Search Tree
How to do simple matrix multiplication
How to find integer pairs with given sum
How to find pairs of number to get magic sum
How to find the largest subarray with sum 0
How to get all Java TimeZone ID's
How to get height of BST using recursive way
How to get integer pairs with given sum from integer array
How to get Maximum Subarray Sum in optimal way
how to get only left child in BST
How to Iterate Map key and value
How to print singly linked list in reverse order
How to reverse a number using stack?
How to reverse a String without special characters
IdentityHashMap
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immutable class
Implement Stack in Java
Implementing Queue in Java
Inorder
Inorder Predecessor and Successor of Binary Search Tree
Insertion sort
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Interface extends another interface
Interface extends another interface in Java
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Interview Questions
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Invert bits of a number
IP
Iterator
Iterator Design Pattern
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java.sql.Timestamp
java.util.Date
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JdbcDaoSupport
JDBCTemplate
join()
jQuery
jQuery notify
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JSON to Java Object
JsonSerializer
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Least Recently Used Cache
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log4j API
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Longest Common Subsequence (LCS) algorithm using Dynamic Programming in java
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Longest Substring without duplicate character
loop
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merge List
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Mirroring Binary Tree
Morgan Stanley Interview questions
Multiply 2 numbers using recursion
Multiply without * operator
Multithreading in java
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MySQL import and export commands
MySql Timewait
mysqldump
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next greater number
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notifyAll()
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ObjectOutputStream
Odd even using ReentrantLock and Condition
OS Details
Pair of given sum
Pangram
Pangram or not
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Permutation
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Pre-Authentication
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Preorder
Print all leaf nodes of a Binary Tree from left to right
Print all pairs with given sum
Printing ODD EVEN
PriorityBlockingQueue
PriorityQueue
Process
QR Code
Queue
Quicksort
read Object from file
Read web page
recursion
ReentrantLock
ReentrantLock and Condition
Reflection
Regular Expression
Regular Expressions
Remove all consecutive duplicates from the string
Remove duplicate
remove null from List
RESTFull
Reverse Linked List
Reverse LinkedList
Reverse number using Stack
Reverse words in a given string
Reverse words in a given String using recursion
Rotate array by N elements
rotate matrix
Rotate matrix by clockwise
Runnable
scale-able data distribution platform
Scanner class
Segregate 0s and 1s in an array by looping only once
Selection sort
Semaphore
sending email
sending email using embedded image
Separate Logger for specific classes or package
Serializable
Serialization
Serve static resources from different locations using spring
Setter Injection
Shallow copy
Simple
SimpleDateFormat
Smallest substring which contains all characters of other String
Smallest window
Smallest window with all characters of other string
SMS
SOAP
Sorting
Sorting array without loop
Sorting Hashmap
sorting hashmap based on values
Sorting HashMap by Values including duplicate in Java
Sorting Integer array without any sorting algorithm or loop
Split the array into two equal Sum subarrays
Split()
Spring
Spring Boot
Spring Data Access
Spring DataSoruce
Spring IOC
spring JDBC
Spring Resource Loader
Spring Security
Spring with hibernate
Stack
Stack using Linked List
Static Vs Volatile
Stream API
Streams
String
String Permutation using Recursion
String Replace
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StringJoiner
StringTokenizer
subarray with sum 0
Successor
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traverse the linked list only once to get middle node
TreeMap
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values()
Variable arity
Vector
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wait()
Web Services
What are the Java TimeZone ID's
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write object to file
XML
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Creating Captcha using Java

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