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

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 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 BufferedWriter Java InputStreamReader Java File Java Read File Line By Line Java FileOutputStream Jar File in Java


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

Java Differences

Java vs JavaScript Python vs Java Kotlin vs Java Java vs C++ C# vs Java Static vs Non-static in Java C vs Java int vs Integer in Java Stack vs Heap in Java Java Array vs ArrayList

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 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 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 achieve abstraction in Java How to call static method in Java

Java 8 Features

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

Java 9 Features

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

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.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

Java InputStreamReader

What is InputStreamReader?

An InputStreamReader is a converter between byte and character streams: It reads bytes and converts them to characters with the help of a charset. The charset it uses can be provided explicitly or by name, or the platform's default charset can be allowed. It comes under the package and extends the abstract class Reader. InputStreamReader is often known as the path which connects streams and character streams as it reads a byte from the given input stream of character.

How to Create InputStreamReader?

Following are the steps to create an InputStreamReader.

Importing the package is the first step in creating an InputStreamReader without this package, we cannot implement InputStreamReader. After we've imported the package, we must follow the steps below.

First, we create an InputStreamReader, which has a reference variable has st. Then we need to create a FileInputStream which has a reference variable fl. The following example demonstrates the above lines.

FileInputStream fl = new FileInputStream( path);
InputStreamReaderst   = new InputStreamReader( fl  );

2. The fetched data is stored using default character encoding by implementing this code. We can also define the character encoding as per the file or one's need. The character encoding can be either UTF8 or UTF16. We have specified the character encoding in the file in the following code by using the Charset class.

InputStreamReaderst   = new InputStreamReader( fl, Charset c );

Constructors of InputStreamReader

Following are the Constructors  provided by InputStreamReader:

  • InputStreamReader(InputStreamst)This constructor is implemented when there is a need to create an InputStreamReader that has the default charset.
  • InputStreamReader(InputStreamst, Charset ): This constructor is implemented when there is a need to create an InputStreamReader that has the specified charset.
  • InputStreamReader(InputStreamst, CharsetDecoder dc): This constructor is implemented when there is a need to create an InputStreamReader that has the specified charset decoder.
  • InputStreamReader(InputStreamst, String name): This constructor is implemented when there is a need to create an InputStreamReader that uses the named charset

Methods of InputStreamReader

Following are the methods provided by InputStreamReader.

  • ready()

This is a method with a return type. This method is implemented when there is a need to check whether the character stream is ready to perform its function ( i.e., whether it can read or not ).

An InputStreamReader is considered ready to perform its function, If an InputStreamReader's input buffer is empty or bytes are available to be read from the underlying byte stream.

  • read(char[] arr)

It is used when it is necessary to read characters from a reader and store them in a predefined array.

  • read(char[] arr, int st, int l)

It is used when several characters equal to length must be read from the reader and stored in the specified array starting at the beginning.

  • close( )

This method is implemented when there is a need to close cInputStreamReader and releases all the Streams attached to it.

 Once this method is implemented, the stream gets closed. Thus, methods such as ready( ), ready(), and other mentioned methods in the articles won't perform their function and will throw an IOException.

  • getEncoding() Method

This method is implemented when there is a need to acquire the type of encoding is implemented to save the fetched data in the input stream.

  • mark()

When it's necessary to mark the point in the stream where data has been read, this method is implemented

  • reset()

This is a method with a return type. It returns the control to the position where the mark was set in the stream.

public class a {
public static void main(String[] args) {
char[] arr = new char[14];

        try {

            FileInputStream fl = new FileInputStream("d://sample.txt");

InputStreamReader File_input = new InputStreamReader(fl );;
System.out.println("File contains the following data:");


catch(Exception e) {

In the above code, first, we imported the important packages to implement FileInputStream and InputStreamReader.

Then we created an array of characters as reference variable as arr and size of 14 as it is the size of the data inside the file.

Then we created a FileOutputStream in which as reference variable as fl and contains specified file path as d://sample.txt. And created an InputStreamReader, a reference variable as File_input, and a default encoding.

Then we read the characters from the file stores them in an array of arrays. To see the data inside the file, we have to print the array. Following is the output obtained when the above code is implemented.

What is InputStreamReader?

The file contains the following text: Hello Everyone, and the same text is shown in the output.