Java Tutorial

Java Tutorial Java Features C++ vs Java Java History Java Hello World Java Development Kit Java Runtime Environment Java Virtual Machine Difference between JDK, JRE, and JVM Memory Areas in Java Java Operators Java Keywords Primitive Data Types Variables

Java Loops

Java Do While Loop Java While Loop Java For Loop Java Enhanced For Loop

Java Programs

Java Basic Programs Factorial Program in Java Fibonacci Series Program in Java Prime Number Program in Java Palindrome Number Program in Java Armstrong Number Program in Java Anagram Program in Java Pattern Programs in Java Calculator Program in Java Leap Year Program in Java Addition Program in Java Number Pattern Programs in Java Star Pattern Programs in Java Package Program in Java Pyramid Program in Java Sorting Program in Java String Palindrome Program in Java Even Odd Program in Java For Loop Program in Java If Else Program in Java Switch Case Program in Java GCD Program in Java LCM Program in Java Hello Program in Java Matrix Program in Java Menu Driven Program in Java Series Program in Java Client Server Program in Java Swapping Program in Java Pig Latin Program in Java Tower of Hanoi Program in Java Recursion Program in Java Matrix Multiplication Program in Java Perfect Number Program in Java Classes and Objects in Java Example Programs String Programs in Java Array Programs in Java Constructor Program in Java Inheritance Program in Java Abstract class Program in Java Interface Program in Java Encapsulation Program in Java Polymorphism Program in Java Exception Handling Program in Java Multithreading Program in Java Thread Program in Java Collection Programs in Java ArrayList Program in Java Stack Program in Java Applet Program in Java Swing Program in Java JDBC Program in Java How to run Java program in command prompt How to run Java program in Eclipse Program to find and replace characters on string in java Program to find the duplicate characters in a string Program to check whether a given character is present in a string or not Java Program to Print Permutations of String Java program to find frequency of characters in a string Java Program to remove duplicate characters in a string

Java Sorting

Sorting Algorithms in Java Merge Sort in Java Quick Sort in Java Bubble Sort in Java Insertion Sort in Java Selection Sort in Java Heap Sort in Java Radix Sort in Java Topological Sort in Java Bucket Sort in Java Counting Sort in Java

Java OOPs Concepts

OOPs - Object Oriented Programming Objects and Classes in Java Methods in Java Java Naming Conventions Constructors in Java Java this keyword Java static keyword Inheritance in Java Aggregation in Java Java super keyword Constructor Chaining and Constructor Overloading Java Polymorphism Static and Dynamic Binding in Java Java Abstraction Abstract class in Java Interface in Java Difference between Abstract class and Interface Java final keyword Packages in Java Access Modifiers in Java Java Wrapper classes Java Numbers Java Characters Java Integer Java Boolean Java Arrays Java Command Line Arguments Java strictfp Keyword Java Math

Java Strings

Java Strings Java String Methods StringBuilder in Java StringBuffer in Java Java Regular Expressions StringBuffer vs StringBuilder String vs StringBuffer String vs StringBuilder String Manipulation in Java Java String Concatenation How to Reverse a String in Java String Array in Java How to Compare Two Strings in Java How to Concatenate Two Strings in Java Why String in Immutable in Java Java.lang.NumberFormatException for Input String String Pool in Java Java Generate Random String How to take String Input in Java Java String Interview Questions

Java Exceptions

Exception Handling in Java Java try catch Java throw Java throws Difference between throw and throws Java finally Java Custom Exception Java Exception Propagation

Garbage Collection

Automatic Resource Management in Java Java Garbage Collection Java finalize() Java gc() Difference between final, finally and finalize


Multithreading in Java Process and Thread in Java Basic Terms in Multithreading Java Thread creation Thread Scheduler in Java Java Thread class DeadLock in Java

Java IO

Java IO Java Read File Java file Reader Java Buffer Reader Java file Writer Java BufferedWriter Java InputStreamReader Scanner in Java Java StringReader Java StringReader Class Java PrintWriter Java File Java Read File Line By Line Java FileInputStream Java FileOutputStream Java Create File Java Delete File Java Open File Java Read File to String Java copy file Java Read JSON file Jar File in Java Java FileNotFoundException


Java Serialization Java transient


Java Network Programming Java Socket Programming Java URL Java URLConnection HttpURLConnection in Java Java InetAddress Java DatagramSocket and Java DatagramPacket


Java AWT


Swing in Java

Java Collections

Collections in Java Java List Interface ArrayList in Java LinkedList in Java Vector in Java Stack in Java ArrayList vs LinkedList in Java ArrayList vs Vector in Java Java Set Interface HashSet in Java LinkedHashSet in Java TreeSet in Java Java Queue Interface PriorityQueue in Java ArrayDeque in Java Java Map Interface HashMap in Java LinkedHashMap in Java TreeMap in Java Dictionary in Java Hashtable in Java Properties in Java Collections class in Java Java Comparable Java Comparator Comparable vs Comparator in Java

Java Generics

Generics in Java

Java Annotations

Annotations in Java


Java JDBC Tutorial JDBC Architecture Types of JDBC Drivers JDBC vs ODBC Java Database Connectivity with MySQL Statements in java Prepared statement in Java Resultset in java Java ResultSetMetaData DatabaseMetaData in Java Callable Statement in Java Transaction Management in java Design of JDBC

Java Differences

Java vs JavaScript Python vs Java Kotlin vs Java Java vs C++ C# vs Java Java float vs double Java vs Scala Static vs Non-static in Java C vs Java int vs Integer in Java Java protected vs private Java vs Dot Net Stack vs Heap in Java Java Array vs ArrayList Java SE vs EE Difference between = = and equals ( ) in java Difference between C, C++, java

How to

How to run Java program How to set path in Java How to check the Java version in cmd How to install Java in Windows 10 How to run Java program in cmd How to add double quotes in a string in Java How to convert list to String in Java How to call a method in Java How to sort an array in Java How to iterate HashMap in Java How to write Java program How to create an array in Java How to create a package in Java How to generate random numbers in Java How to input String in Java How to create thread in Java How to find length of String in Java How to sort a string in Java How to use scanner in Java How to achieve multiple inheritance in Java How to find the length of an Array in Java How to run Java program in Eclipse How to call a function in Java How to create array of objects in Java How to create custom exception in Java How to import packages in Java How to run applet Program in Java How to take Array Input in Java How to achieve abstraction in Java How to call static method in Java How to compare characters in Java How to compare dates in Java How to create a linked list in Java How to get ASCII value of char in Java How to initialize string array in Java How to Install Java on MAC How to run java program in ubuntu How to find characters with the maximum number of times in a string java How to Set Java_home in Linux How to Split the String in Java with Delimiter How to uninstall the Java in Ubuntu How to Split String by Comma in Java How to remove special characters from String in Java How to remove last character from String in Java

Java 8 Features

Java 8 Features Lambda Expressions in Java Functional Interface in Java Streams in Java Java Base64 Encoding and Decoding Java Stringjoiner Class Parallel Arrays Sort in Java

Java 9 Features

Java 9 Tutorial Java 9 Try With Resources Java 9 Interface Private Method

Java 16

Java 16

Java 17

What is new in Java 17

Java Servlet Tutorial

Java Servlets Tutorial

Java JSP Tutorial

Java JSP Tutorial

Hibernate Tutorial

Hibernate Tutorial

Spring Tutorial

Spring Tutorial

Spring MVC Tutorial

Spring MVC Tutorial

Jenkins Tutorial

Jenkins Tutorial

Java Math Methods

Math.abs() Math.acos() Math.addExact() Math.asin() Math.atan () Math.atan2() Math.cbrt() Math.ceil() Math.copysign() Math.cos() Math.cosh() Math.decrementExact() Math.exp() Math.expm1() Math.floor() Math.floorDiv() Math.floorMod() Math.fma() Math.getExponent() Math.hypot() Math.IEEEremainder() Math.incrementExact() Math.log() Math.log10() Math.log1p() Math.max() Math.min() Math.multiplyExact() Math.multiplyFull() Math.negateExact() Math.nextAfter() Math.nextDown() Math.nextUp() Math.pow() Math.random() Math.rint() Math.round() Math.scalb() Math.signum() Math.sin() Math.sinh() Math.sqrt() Math.subtractExact() Math.tan() Math.tanh() Math.toDegrees() Math.toIntExact() Math.toRadians() Math.ulp()

Java String Methods

toCharArray() copyValueOf() endsWith() equals() equalsIgnoreCase() format() getBytes() getChars() hashCode() indexOf() intern() isEmpty() join() lastIndexOf() length() replace() replaceAll() replaceFirst() split() startsWith() subSequence() substring() toLowerCase() toUpperCase() trim() valueOf()

Java Conversion

Java Convert String to int Java Convert int to String Java Convert String to long Java Convert long to String Java Convert String to float Java Convert float to String Java Convert String to double Java Convert double to String Java Convert String to Date Java Convert Date to String Java Convert String to Object Java Convert Object to String Java Convert String to char Java Convert char to String Java Convert int to long Java Convert long to int


Functional Interfaces in Java Singleton class in Java Awesome explanation of Strings in Java Object class in Java Static class in Java All the important string methods in Java String Handling Method in Java What are Array strings in Java Advantages and Disadvantages of Strings in Java Big Decimal class in Java Class definition in Java Char and String differences in Java Difference between String, StringBuffer and StringBuilder in java Replace character in string Java String Coding Interview Questions in Java What is String in Java? String isnullorempty in Java String Matches in Java Trim Method in String Java Bean class in Java Libraries in Java Arithmetic Operations on String in Java Convert Char array to string in java Check whether Java is installed or not How to calculate time difference in Java How to stop execution after a certain time in Java Jagged Array in Java Java ArraylistRemove() Time Complexity Java Swing Time Picker Zigzag Array in Java Array and String based questions in Java Array and String with Examples in Java Best Practices to use String Class in Java What is string in Java why it's immutable Java String Java String Inbuilt functions Java String Matches vs Contains Sum of digits in string in java Check the presence of Substring in a String in java Java import packages Interfaces and Classes in Strings in Java Maximum length of string in java Hidden classes in Java Class memory in Java public static void main string args meaning in java Reverse a String in Java String Concatenation in Java Difference between String and Char Array in Java Buffer reader to read string in Java Split String into String Array in Java Reverse a String using Collections in Java Upcasting and Downcasting in Java String Declaration in Java Method Overloading In Java Java Solid Principles Java Architecture Binary Search Java Star Program in Java Java Type Casting Java Pass-by-Reference Java Framework List Java Destructors Java Control Statements Java Byte Code Java Beans Java Identifiers Character Array in Java Java Applications Java Substring Java Session Non-primitive data types in Java Matrix Multiplication in Java JIT in Java Java Tokens Java Externalization Default Virtual Behaviour in C++ vs Java Why we use static in Java Session Tracking in Java Knapsack problem in Java Java Logo Java exception list Java Iterator Java instance variable Frugal number in Java Fork Join in Java Date time API in java Compile time vs Runtime in java Compare time in java AES 256 Encryption in Java Advanced Java skills What is advance Java? User Defined Exception in Java Upcasting in Java Tree Implementation in Java Special Operators in Java Reentrant Lock in Java Perfect Number in Java Java logger Java LinkedList vs ArrayList File Operation in Java Differences between Byte Code and Machine Code Difference between String Tokenizer and split Method in Java Difference between JIT and JVM in Java Constructor Overloading in Java Conditional operator in Java Concurrent Linked Deque in Java with Examples Command Class in Java Java Break Keyword Best Java IDE Association in Java Access specifiers in Java

How to remove special characters from String in Java

Strings in Java are Objects that are supported inside by a burn exhibit. Since exhibits are immutable (cannot develop), Strings are changeless too. A completely new String is made whenever a change to a String is made.


<String_Type>    <string_variable> = "<sequence_of_strings>";

Java String class gives a ton of strategies to perform procedure on strings like compare(), concat(), rises to(), split(), length(), split(), compareTo(), intern(), substring() and so on.

There are two methods for making String objects:

  • String literal
  • New keyword

1. String Literal: Java String literal is made by utilizing twofold statements.

Example: String s = "Victory"; 

2. New Keyword: The new keyword is used for creating the string.

Example: String s=new String("Victory");

replaceAll() method

A character, which isn't a letter set or numeric character is known as a unique character. We ought to eliminate every one of the exceptional characters from the string with the goal that we can peruse the string plainly and easily. Unique characters are not lucid, so eliminating them prior to reading would be great.

Java replaceAll() strategy for String class replaces every substring of this string that coordinates the given ordinary articulation with the substitution.


Public String replaceAll(String regex, String replacement) 

You can utilize a standard articulation and replaceAll() technique for java.lang.String class to eliminate all exceptional characters from a string. An extraordinary person is only characters like - ! #, %, and so on. Exactly, you want to characterize what is an exceptional person for you. When you characterize that, you can utilize a normal articulation to supplant those characters with a void String, which is identical to eliminating all extraordinary characters from a string.

For instance, assume your string contains a few extraordinary characters, like "Awesome!!!" and you need to eliminate symbols,!!! To decrease some energy, you can utilize replaceAll("!", "") to dispose of all interjection marks from the string. Also, in the event that your string contains numerous extraordinary characters, you can eliminate every one of them simply with the help of picking alphanumeric characters, for example,  replaceAll("[^a-zA-Z0-9_-]", "), which will supplant anything with void string aside from a to z, a to z, 0 to 9,_ and dash. This technique acknowledges two boundaries:

Regex: It is the ordinary articulation to which string is to be coordinated. It could be of various sorts.

Replacement: The string to be filled in for the match.

The Java Regex or Regular Expression is an API to characterize an example for looking at or controlling strings. It is broadly used to characterize the limitation on strings like secret phrases and email approval. In the wake of learning the Java regex instructional exercise, you will actually want to test your normal articulations with the Java Regex Tester Tool. Java Regex API gives one interface and three classes in java.util.regex bundle. The Matcher and Pattern classes give the office of Java normal articulation. The java.util.regex bundle gives the following classes and connection points to standard articulations.

  • MatchResult interface
  • Matcher class
  • Pattern class
  • PatternSyntaxException class

Matcher class

It executes the MatchResult interface. It is a regex motor which is utilized to perform a matching procedure on a person's succession.

  • boolean matches(): Test whether the ordinary articulation matches the example.
  • boolean find(): Finds the following articulation that matches the example.
  • boolean find(int start): Finds the following articulation that matches the example from the given beginning number.
  • String group(): Returns the matched aftereffect.
  • int start(): Returns the beginning list of the matched aftereffect.
  • int end(): Returns the closure record of the matched aftereffect.
  • int group count(): Returns the all-out number of the matched aftereffect.

Pattern class

It is the incorporated variant of a standard articulation. It is utilized to characterize an example of the regex engine.

  • Static Pattern compile(String regex): Incorporates the given regex and returns the occurrence of the Pattern.
  • Matcher matcher(CharSequence input): Itmakes a matcher that coordinates the given contribution with the example.
  • static boolean matches(String regex, CharSequence input): It fills in as the blend of arranging and matcher strategies. It assembles the customary articulation and coordinates the given contribution with the example.
String[] split(CharSequence input)

How does the replaceAll() method work in java

replaceAll is the strategy that is available in the String class. It accepts two boundaries as info, for example, customary articulation and substitution. As the name proposes, supplanting some piece of a string or the entire string is utilized.

This strategy tosses the exemption referenced underneath:

1. PatternSyntaxException: This exemption is the uncontrolled special case in java which will possibly happen on the off chance that there is a blunder in the standard articulation we pass in the technique as the information boundary.

2. Regular expression detail: The regular expression that we are passing as a string into the strategy boundary, yet this normal articulation is the example of class' ordered occurrence. it is available in java.util.regex.Pattern bundle.

3. Strategies accessible: Split (CharSequence input): This strategy returns us string [] (string exhibit) and takes input for the benefit of we need to part. Split (CharSequence input, int limit): works similarly, yet this technique likewise takes a breaking point boundary. Static Pattern compile(String regex, int flags): This strategy takes two boundaries, standard articulation and banner and aggregates our customary articulation.

4. String pattern()

5. static String quote(String s)


public class RemoveSpecialCharacterEx1  
	public static void main(String args[])   
		String s= "Hello#world%^Welcome*&.";   
		s = s.replaceAll("[^a-zA-Z0-9]", " ");  


Hello world  Welcome

In the accompanying model, the removeAll() strategy eliminates every one of the extraordinary characters from the string and sets up a space for them.

Removing Special Characters Using User-Defined Logic

In the accompanying model, we are characterizing the rationale to eliminate exceptional characters from a string. We realize that the ASCII worth of capital letter in order begins from 65 to 90 (A-Z), and the ASCII worth of little letter set begins from 97 to 122 (a-z). Each character contrast and their comparing ASCII esteem.

Assuming that both the predefined condition returns genuine, it returns genuine else get back misleading. The for circle executes till the length of the string. While the string arrives at its size, it ends execution, and we get the resultant string.


public class RemoveUserDefinedSpecialCharacter 
	public static void main(String[] args)   
		//declaring a string having special characters   
		String str="Pr!ogr#am%m*in&g Lan?#guag(e";  
		String resultStr="";  
		//loop execute till the end of the string   
		for (int i=0;i<str.length();i++)  
			//comparing alphabets with their corresponding ASCII value  
			if (str.charAt(i)>64 && str.charAt(i)<=122) //returns true if 			both conditions are true  
	System.out.println("String after removal of special characters: "+resultStr);  


String after removal of special characters: ProgrammingLanguage