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Core Java tutorial in detail

>Collection framework Tutorial in java in detail

Overriding equals and hashcode method tutorial in detail

>Exceptions handling Tutorial in java in detail

Threads / Multi-threading Tutorial in java

>Thread Concurrency Tutorial in java

>Series of JVM and Garbage Collection (GC) in java - Best explanations ever with exclusive summary section

>Serialization And Deserialization Tutorial

Dates Tutorial in java in detail with full programs

JDBC - Java Database connectivity tutorial in java

File IO | File handling Tutorial in java in detail

>RegEx (Regular expression) tutorial with examples

>iText library tutorial - working with PDF files in java

>Sorting & searching in java - Bubble, selection, insertion, Advanced sorting - Merge and quick sort, Binary Search with recursion

>Data structures in java - Stack, queue, Singly and doubly linkedList

>Custom Implementation of Map, Set and Lists in java - HashMap, LinkedHashMap, HashSet, LinkedHashSet, ArrayList, Vector

>Basic programs for java beginners

>Interview Programs (beginner to advanced) in java

>Core java QUIZ - Mcq(Multiple choice questions)

>Interview Questions and answers in Java - Top and most important - BEST EXPLANATION EVER

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Core Java tutorial in detail

Java tutorial & history of java >

Java tutorial - Advantage, Where is java used in real world, platform independent language

History of java - Team, Initial target, first big success, now a days, 4 platforms, creator, principles, releases of java

Setting JDK path in windows and linux >

Download and install JDK, Setting environment variables JAVA_HOME & JDK PATH temporarily and permanently in windows, What is a path? need to set PATH variable?

JDK path in Linux and Unix temporarily and permanently, What is a path?Why we need to set PATH variable? setting environment variable

First java program using notepad and eclipse >

Writing and executing first java program through CMD in windows, Setting up ECLIPSE in java, Directory of .class file

Classes, objects, interface, abstract classes and constructors in core java tutorial >

Classes and Objects in java - Class consist of blocks, constructor, variables, methods, inner classes and inner interfaces

Interface in java - Multiple inheritance, Marker interfaces, When to use interface practically, 12 features

Abstract class in java - When to use abstract class or interface practically, 10 features

Constructor in java - Constructor chaining, access modifiers with constructors, constructor overloading, exception thrown, constructors are not inherited

10 Differences between Interface and abstract class in java - in detail with programs

Access modifiers in core java >

Access modifier /Access specifier in java - private, package-private(Default), protected and public - Diagram and tabular form

Method overloading and overriding in core java >

Method overloading in java - in detail with programs,10 Features,need of method overloading, overloading main method, Diagram and tabular form of Implicit casting/promotion of primitive Data type

Method overriding in java - in detail with programs, 10 Features, need of method overriding, understanding @Override annotation, Covariant return, diagram to understand access modifiers

10 Difference between Method overloading and Method overriding in java - in detail with programs

Naming conventions in core java tutorial >

Source file naming rule in java - When source file consists of public class & non-public classes OR only non-public classes

Java naming conventions for interface, class, package, variable, reference variable to object, method, constant - using code comments in java

oops principle in core java tutorial >

4 oops (object oriented programming system) concepts in java > Encapsulation, Abstraction, Inheritance, Polymorphism in detail with programs, abstraction interface via Abstract classes, Inheritance via extends and implements,Compile Runtime polymorphism

What is Encapsulation in java - OOPS principles

What is Abstraction in java - OOPS principles

What is Inheritance in java - OOPS principles

What is compile and runtime Polymorphism in java - OOPS principal

4 java platforms in core >

Differences and relation between 4 Java Programming Language Platforms > Java SE/ J2SE - Standard Edition, Java EE/ J2EE - Enterprise Edition, Java ME/ J2ME - Micro Edition, JavaFX

JDK, JRE, JVM in core java >

JDK (Java Development Kit), JRE (Java Runtime environment), JVM (java virtual machine), Differences between JDK, JRE and JVM, OpenJDK, JIT Compiler (Just In Time Compiler) internal working

JVM (java virtual machine)

What is JDK (Java Development Kit)

What is JRE (Java Runtime environment)

What are Differences between JDK, JRE and JVM

What is OpenJDK

What is JIT Compiler (Just In Time Compiler) in JVM

Data types, operators, control flow statements in core java >

Primitive, Custom/reference Data Types, Integer, Floating-Point, Character and String literal, Escape sequence in java, decimal to hexaDecimal and binary conversion program

What are Primitive Data Types in java

What are Custom/reference Data Types in java

What are Literals in java - Integer, Floating-Point, Character and String literal, Escape sequence in java

What is Implicit casting/promotion of primitive Data type with programs in java

Arithmetic, Unary, Equality, Relational, Conditional, Bitwise, Bit Shift, Assignment, instanceof operators in detail with programs.

What are Arithmetic Operators in java

What are Unary Operators in java

What are Equality, Relational, and Conditional Operators in java

What are Bitwise & Bit Shift Operators in java

What are Assignment Operators in java

What are instanceof Operator (used for Type Comparison) in java

Control Flow Statements = Decision making - if, else, switch | Looping - for, Infinite, Enhanced for loop, while, do-while | Branching - break, Labeled break, continue, Labeled continue, return, goTo

If, if-else, if if-else else, switch - Decision making statements with examples in java

For, while, do-while, Enhanced for loop, Infinite loop - looping statements with examples in java

BREAK, Labeled break, CONTINUE, Labeled continue, RETURN, goTo - Branching statements with examples in java

Difference between while and do-while loop with example in java

goTo keyword - is goTo keyword used? or how to use it correctly in java with example

What are Blocks in java

Arrays in java - Declare, Initialize, display, add values and iterate on 1D(One Dimensional), 2D (Two Dimensional) and jagged (Ragged) Arrays

Keywords in core java >

Keywords in java language

final keyword in java - 20 salient features

Static keyword in java - variable, method, class, block - 24 salient features

Why Static method cannot be overridden in java - Explanation with program

What is static import in core java

Super keyword in java - Invoke constructor, Access instance variable, Invoke instance method of immediate super class using super

this keyword in java - in constructor, refer instance variable, call instance method, this (current class object) as a parameter, return this

What is use of strictfp keyword in java

const keyword in java

garbage collection java >

How garbage collection works internally in java | Mark and sweep algorithm

finalize method in java - 13 salient features

Why finalize method is protected in java - An explanation with programs

String and String pool in core java >

String is Immutable in java

String pool/ String literal pool/ String constant pool in java

Difference between constant pool and String pool in core java

Autoboxing and unboxing in core java >

Autoboxing and unboxing in java - How it works internally in detail with 10 examples- Widening, AutoBoxing and Var-args

Java caches Integer objects formed from primitive int values between values -128 to 127

10 points on why we are still using primitive data types in java ? When to use primitive type and wrapper classes?

Method overloading with Widening, Autoboxing and Var-args - Who beats whom in java?

Change boxing or Unboxing Setting in eclipse in java - Advantages

Immutable classes in core java >

Creating Immutable class in java

Cloning in core java tutorial >

Cloning in java using clone- Shallow and deep copy - 8 techniques for deep copying- 8 important points about cloning

Reflection in core java >

Reflection in java - Methods used and program

Covariant return type, Varargs and toString method in core java tutorial>

What is Covariant return type in core java

Varargs method (Variable arguments) in core java

how to use toString method in java

Design patterns in core java tutorial >

Singleton in java, Doubly Locked Singleton class/ Lazy initialization, enum singleton, eager initialization in static block

Few basic terminologies, concepts in core java tutorial>

Difference between arguments and parameters in java

Copy by value and copy by reference in java - Primitive are passed by value & objects by reference

ASCII codes >

ASCII values of characters in java

Few more facts about java >

How many java developers are there in the world

Differences in core java >

10 Differences between Interface and abstract class in java - in detail with programs

10 Difference between Method overloading and Method overriding in java - in detail with programs

Difference between equals method and == operator in java - testing with String and StringBuffer

Difference between String, StringBuffer and StringBuilder in java - In depth coverage

Differences between Instance initialization block and Static initialization block in java - Features in detail with programs

Difference between constant pool and String pool in core java

Inner classes in core java >

Inner class/ nested class, static nested class, local and anonymous inner class in java

WHY Local Inner class cannot access the non-final local variables but can access final local variables.

Top and most important Core java interview question and answers >

CORE JAVA - Top 120 most interesting and important interview questions and answers in core java

Solving few very common and frequently Core java errors >

Solved - Failed to load the JNI shared Library - JDK - eclipse

Resolve Error: Could not find or load main class

error: Class names are only accepted if annotation processing is explicitly requested in java: solution

Resolve error: Class names, 'className', are only accepted if annotation processing is explicitly requested

Few important java programs>

Find out windows version installed in your system using java program and cmd

How to find out the classpath and where all the jar's are loaded from in java

How to find out location from where the main java class you are running is loaded

Find eclipse version in your system

Find out Java version (32 or 64 bit) installed in your system using java program and cmd

Find out JDK version installed in your system using java program

Find out Operating System name using java program

What is classpath environment variable in java, how to configure it from CMD with example program

how to check string contains substring or not using indexOf and contains method in java

Few JVM related basic java programs>

Find out total number of available processors to JVM

Find Total Amount Of Memory In JVM

Find Free Memory Available In Java virtual machine

Find Maximum Memory That JVM can use

How to terminate JVM in java

Additional core java knowledge>

How many methods can be written in core java class or interface

Overriding equals and hashcode method tutorial in detail

Override equals() and hashCode() method

String, Integer, Long, Double, Float, Short and any other wrapper class should be preferred to use a key in HashMap

How Integer is used as key in Hashmap

Top Overriding equals and hashcode method interview question and answers >

Overriding equals and hashcode method - Top 18 Interview questions

For advanced/experienced users >

Overriding equals and hashcode method of Employee class and using it as a key in custom HashMap >

>HashMap Custom implementation - put, get, remove Employee object

Overriding equals and hashcode method of Employee class and using it as a key in custom LinkedHashMap >

>LinkedHashMap Custom implementation - put, get, remove Employee object

Overriding equals and hashcode method of Employee class and using it as an element in custom HashSet>

>Set Custom implementation - add, contains, remove Employee object

Overriding equals and hashcode method of Employee class and using it as an element in custom LinkedHashSet>

>LinkedHashSet Custom implementation - add, contains, remove Employee object

Collection framework Tutorial in java in detail with diagrams and programs

Basic Collection tutorial in core java >

Collection tutorial in java

List tutorial in java >

java.utilArrayList tutorial in java

ArrayList custom implementation in java

java.util.LinkedList tutorial in java

Set tutorial in java >

java.util.HashSet tutorial in java

Set Custom implementation in java

LinkedHashSet Custom implementation in java

EnumSet tutorial in java with program

Map tutorial in java >

HashMap tutorial in java

HashMap Custom implementation in java

LinkedHashMap Custom implementation in java

ConcurrentHashMap tutorial in java - with Segments formation in detail with diagram

IdentityHashMap tutorial in java with program

WeakHashMap tutorial in java

EnumMap tutorial in java with program

Basic Collection tutorial in core java - All properties in tabular form >

Collection tutorial in java - java.util.List, java.util.Set and java.util.Map all properties in tabular form

Collection framework java tutorial : Collection hierarchy in core java >

List hierarchy tutorial in java - Detailed - java.util.ArrayList, java.util.LinkedList, java.util.vector, java.util.concurrent.CopyOnWriteArrayList classes

Set hierarchy tutorial in java - Detailed - java.util.HashSet, java.util.concurrent.CopyOnWriteArraySet, java.util.LinkedHashSet, java.util.TreeSet, java.util.concurrent.ConcurrentSkipListSet, java.util.EnumSet classes

Map hierarchy tutorial in java - Detailed - java.util.HashMap, java.util.Hashtable, java.util.concurrent.ConcurrentHashMap, java.util.LinkedHashMap, java.util.TreeMap, java.util.concurrent.ConcurrentSkipListMap, java.util.IdentityHashMap, java.util.WeakHashMap, java.util.EnumMap classes

ConcurrentModificationException , Fail-fast and Fail-safe >

ConcurrentModificationException, Fail-fast and Fail-safe in detail in java

Collection framework java tutorial : Important Collection - Similarity and Differences in core java >

List Differences tutorial in java >

ArrayList vs LinkedList - Similarity and Differences in java

ArrayList vs Vector - Similarity and Differences in java

List vs Set - Similarity and Differences in java

Set Differences tutorial in java >
HashSet vs LinkedHashSet vs TreeSet - Similarity and Differences in java

Map Differences tutorial in java >

Similarity and Differences between HashMap and Hashtable in java

Similarity and Differences between HashMap and ConcurrentHashMap - in java

HashMap vs Hashtable vs LinkedHashMap vs TreeMap - Differences in java

Similarity and Differences between HashMap vs IdentityHashMap - with program in java

Differences between few more important Collection framework classes in java >

Collection vs Collections - Differences between in java

Comparable vs Comparator - differences between in java

Similarity and Differences between Iterator vs ListIterator - in java

Differences and similarities between Iterator vs Enumeration - in java

Convert Array to list, list to array,

Array to set, Set to array in java>

How to convert ArrayList to HashSet and Set to Array in Java examples

convert Array to Set and Set to array in Java

How to convert Array to List and ArrayList to array in Java

Synchronize ArrayList - collection framework tutorial in java tutorial >

How to synchronize arraylist in java to make it completely thread safe in java

What is default capacity of ArrayList and Vector, and how they are resized in collection framework tutorial in core java >

what is the default initial capacity of ARRAYLIST, how it is resized and size is increased in java

what is the default initial capacity of VECTOR, how it is resized and size is increased in java

Collection framework java tutorial : Important Similarity and Differences Collection classes in concurrent and non-concurrent packages in java >

ArrayList vs CopyOnWriteArrayList - Similarity and Differences with program in java

HashSet vs CopyOnWriteArraySet - Similarity and Differences with program in java

TreeSet vs ConcurrentSkipListSet - Similarity and Differences with program in java

TreeMap vs ConcurrentSkipListMap - Similarity and Differences with program in java

Collection framework java tutorial : Sorting Collection by implementing comparator and Comparable, using TreeMap and TreeSet, Collections.sort and Arrays.sort tutorial in java >

Comparable vs Comparator - differences and sorting list by implementing Comparable and Comparator in classes and inner classes in java

Arrays.sort to sort arrays by implementing Comparator and how Comparator of superclass can be used by subclasses in java

Sort Set by using TreeSet and by implementing Comparator and Comparable interface in java

Sort Map by key in Ascending and descending order by implementing Comparator interface and overriding its compare method and using TreeMap in java

Sort Map by value in Ascending and descending order by implementing Comparator interface and overriding its compare method in java

Top Collection Interviews question and answers >
COLLECTION - Top 50 interview questions and answers in core java for fresher and experienced

Consequence and advantage of using ArrayList and Vector tutorial in multithreading environment in java >

Consequence of using ArrayList in multithreading environment in java

Advantage of using Vector in multithreading environment in java

Exceptions Tutorial in java in detail with diagrams and programs

Exception definition in java tutorial>

Exception handling, exception hierarchy in java

checked, unchecked Exceptions and Error in Exception handling tutorial in core java>

Checked (compile time exceptions) and UnChecked (RuntimeExceptions) in java - Definition and differences

What are checked (compile time exceptions) in java

What are unchecked (Runtime Exceptions) in java

Error in exception handling in java - Program to show StackOverflowError

5 Exceptions handling keywords - try, catch, finally, throw and throws in Exception handling tutorial in core java >

5 keyword in java exception handling

try catch finally block in Exception handling in core java

Finally block in java

throw exception in java

throws exception in java

Nested try-catch block in java

Multiple catch block in java

What will happen when catch and finally block both return value, also when try and finally both return value in java

User defined Exceptions tutorial>
Creating User defined checked and unchecked Exception/ custom Exception in java

Automatic Resource Management and Try-with-resources in java 7 in Exception handling tutorial in core java >

Catch block and Automatic Resource Management in java 7

Try-with-resources in java - java.lang.AutoCloseable interface

Exception propagation>

Exception propagation in java - deep understanding of how checked and unchecked exceptions are propagated

Exception chaining /wrapping tutorial >

what is Exception chaining / wrapping in java

Exception stack trace and debugging it in java tutorial >

What is a stack trace in exceptions in java, how to debug exceptions in application

Method overloading and Method overriding with Exception >

Throw/declare checked and unchecked exception while overriding superclass method in java

Method overloading on basis of exceptions in Exception handling in core java

12 Exception handling best practices in Exception handling tutorial in core java >

12 Exception handling best practices and guidelines for using exceptions in java

Handling Exception in static block tutorial >

How to handle exception thrown from static block in java? Why throw not allowed in static block in java

Important Exception differences in Exception handling tutorial in core java >

Differences between Exception and Error in java

Differences between throw and throws in Exception handling in core java

Final, Finally and Finalize - difference and similarity in java

Difference between multiple catch block and multi catch syntax in Exception handling in core java

Most frequently occurring Exception and Errors in java >

Most common and frequently occurring checked, unchecked Exceptions and Errors in java

Most common and frequently occurring checked (compile time) and Errors in java >

Most common and frequently occurring unchecked (runtime) in java.

Most common and frequently occurring Errors in java >

Few More >

What is difference between ClassNotFoundException and NoClassDefFoundError in java

Top Exception interview question and answers in Exception handling tutorial in core java >

EXCEPTIONS - Top 60 interview questions and answers in java for fresher and experienced - detailed explanation with diagrams Set-1 > Q1- Q25

EXCEPTIONS - Top 60 interview questions and answers in java for fresher and experienced - 30 important OUTPUT questions Set-2 > Q26- Q60

Threads Tutorial in java

Threads basics in threads / Multithreading tutorial in java >

What is thread in java

Thread states/ Thread life cycle in java in detail with diagram, examples and scenarios

Difference between Process and Thread in java

Write your first thread in java >

Implementing Threads in java by implementing Runnable interface and extending Thread class - How to create your first thread in java/ Learn creating more than one thread (Multithreads) in java

Threads implement their own stack in java - demonstration using program/examples and diagram in threads / Multithreading tutorial

Differences between implementing Runnable interface and extending Thread class in threads / Multithreading tutorial in java

Thread behaviour is unpredictable in threads / Multithreading tutorial in java

When threads are not lightweight process in java, in fact they become heavy weight process

run() and Start() methods in threads / Multithreading tutorial in java >

What will happen if we don’t override run method of thread in java?

What will happen if we override start method of thread in java?

Difference between starting thread with run() and start() methods in java

Can we start Thread again in java?

Volatile keyword vs synchronized in threads / Multithreading tutorial in java>

Volatile keyword in java- difference between synchronized and volatile, 10 key points about volatile keyword, why volatile variables are not cached in memory in threads / Multithreading tutorial in java

Differences between synchronized and volatile keyword in detail in java

Race Condition in threads / Multithreading tutorial in java >

Race condition in multithreading and it's solution in java

Consumer Producer problem solution using different techniques in threads/Multithreading tutorial in java >
Solve Consumer Producer problem by using wait() and notify() methods in multithreading tutorial in java

solve Consumer Producer problem by using wait() and notify() methods, where consumer can consume only when production is over in java

How to solve Consumer Producer problem without using wait() and notify() methods, where consumer can consume only when production is over in java

BlockingQueue in threads / Multithreading tutorial in java >

Solve Consumer Producer problem by using BlockingQueue in multithreading in java

Custom implementation of LinkedBlockingQueue class which implements BlockingQueue interface in threads / Multithreading tutorial in java

Producer Consumer pattern using Custom implementation of BlockingQueue interface in java

DeadLock and its detection in threads / Multithreading tutorial in java >

Deadlock in multithreading - program/example to form DeadLock, solving DeadLock, measures to avoid Deadlock in java.

VisualVM - Thread dumps - Generating and analyzing Thread Dumps using VisualVM - step by step detail to setup VisualVM with screenshots in java

JSTACK - Thread dumps - Generating and analyzing Thread Dumps using JSATCK - step by step detail to setup JSTACK with screenshots in java

Reason why suspend() and resume() methods are deprecated and Deadlock prone in threads / Multithreading tutorial in java

destroy() method in java - usage, reason why destroy() method is deprecated and Deadlock prone in threads / Multithreading tutorial in java.

Important Thread methods (salient features, usage with programs/example) in threads / Multithreading tutorial in java>

Sleep() method in threads - 10 key features with programs/example in java

Wait() and notify() methods- Definition, 8 key features, solving consumer producer problem with & without these methods and consequences of not using wait() and notify() methods in java.

Yield() method in threads - 8 key features with programs/examples in threads / Multithreading tutorial in java

Differences between implementing Runnable interface and extending Thread class in threads / Multithreading tutorial in java

Differences between synchronized and volatile keyword in detail in java

Object and class lock in threads / Multithreading tutorial in core java >

Acquiring object lock - synchronization blocks and methods- multiple threads may exist on same object but only one thread of that object can enter synchronized block/method at a time in java.

Suppose you have 2 threads (Thread-1 and Thread-2) on same object. Thread-1 is in synchronized method1(), can Thread-2 enter synchronized method2() at same time in java?

Suppose you have 2 threads (Thread-1 and Thread-2) on same object. Thread-1 is in static synchronized method1(), can Thread-2 enter static synchronized method2() at same time in java?

Suppose you have 2 threads (Thread-1 and Thread-2) on same object. Thread-1 is in synchronized method1(), can Thread-2 enter static synchronized method2() at same time in java?

Suppose you have thread and it is in synchronized method and now can thread enter other synchronized method from that method in java?

Suppose you have thread and it is in static synchronized method and now can thread enter other static synchronized method from that method in java?

Suppose you have thread and it is in static synchronized method and now can thread enter other non static synchronized method from that method in java?

Suppose you have thread and it is in synchronized method and now can thread enter other static synchronized method from that method in java?

Suppose you have 2 threads (Thread-1 on object1 and Thread-2 on object2). Thread-1 is in synchronized method1(), can Thread-2 enter synchronized method2() at same time in java?

Suppose you have 2 threads (Thread-1 on object1 and Thread-2 on object2). Thread-1 is in static synchronized method1(), can Thread-2 enter static synchronized method2() at same time in java?

Guidelines to threadsafe code in core java >

Guidelines to thread safe code, most important point we must take care of in multithreading programs/examples in java

More about Threads in threads / Multithreading tutorial in java >

ReentrantLock class provides implementation of Lock’s newCondition() method - description and solving producer consumer program using this method

What are applications of ReEntrantLock in java

ReadWriteLock and ReentrantReadWriteLock in thread concurrency tutorial in java >

Fork/Join framework in thread concurrency tutorial in java >

Important Similarity and Differences in thread concurrency tutorial in java >

Thread concurrency - Top 50 interview questions and answers (detailed explanation with programs) in java

Serialize and DeSerialize object by implementing Externalizable interface- override writeExternal() and readExternal() methods

Difference between Externalizable and Serialization interface in java

serialVersionUID >

What is serialVersionUID? Impact of not defining serialVersionUID in class and avoiding InvalidClassException

Constructor call during DeSerialization >

Is constructor of class called during DeSerialization process

Is constructor of super class called during DeSerialization process of sub class

Serializing and DeSerializing Singleton >

Avoid Deserialization from process creating another instance of Singleton class

Preserving Singleton’s state during DeSerialization >

Can you Serialize Singleton class such that object returned by Deserialization process is in same state as it was during Serialization time

Serializing and DeSerializing primitive data types >

Are primitive types part of serialization process

What values will int and Integer will be initialized to during DeSerialization process if they were not part of Serialization

Serializing class of Collection Api’s >

can list, set and maps be Serialized and DeSerialized

Static and Transient are not serialized >

Can subclass avoid Serialization if its superClass has implemented Serialization interface

Serialization Interviews >

Serialization - Top 25 interview questions (detailed explanation with programs)

Customizing Serialization process by implementing Serializable and Externalizable >

Serialize and DeSerialize object using files in java

Avoid ObjectInputStream.readObject() from throwing EOFException at End Of File in java

Serialize and DeSerialize object by implementing Externalizable interface and using files in java

IMAGE - Storing in and retrieving out from database

JDBC- Insert/Store/save IMAGE in database by using PreparedStatement's setBinaryStream and executeUpdate methods, using BLOB data type - in java

JDBC- Retrieve IMAGE from database by using PreparedStatement's executeQuery, ResultSet's getBlob method - using BLOB data type - in java

FILE - Storing in and retrieving out from database

JDBC- Insert/Store/save FILE in database by using PreparedStatement's executeUpdate and setCharacterStream methods, using CLOB data type - in java

JDBC- Retrieve FILE from database by using PreparedStatement's executeQuery and ResultSet's getClob method, using CLOB data type - in java

RegEx (Regular expression) tutorial with examples in java

Numeric check >

1. how to check string contains numeric value in java using Regex(Regular Expression) program

2. How to check string contains ONLY numeric value in Java using Regex(Regular Expression) program

Alphabet check >

3. How to check string contains at least one alphabets in Java using Regex(Regular Expression) program

4. How to check string contains ONLY alphabets/letters in Java using Regex(Regular Expression) program

Special character check >

5. How to check string contains special characters in Java using Regex(Regular Expression) program

6. How to check string contains ONLY special characters in Java using Regex(Regular Expression) program

Alpha numeric check >

7. How to check string is alphanumeric or not in Java using Regex(Regular Expression) program

Labels: Core Java Core Java Tutorials TUTORIALS