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 IO

It is a part of java libraries but is often known as I/O streams, file I/O, and file handling. The Java I/O concept satisfies the need for input processing and output generation. It has predefined classes used for performing input-output operations for files and input-output operations performed by a user through keyboard and console. To meet the requirements above, Java employs the concept of a stream. I/O operations become faster with this concept. It enables a program to write and read entire objects to streams. One of the main applications of Java I/O is to implement the concept of file handling in Java.

File Handling

As we mentioned, stream a lot of time in the above passage, so you might be wondering what stream is and how much it aids IO operations; so let's take a look at the concept of the stream. As the name implies, it is being used to implement two functions: reading and writing data in a file. It is used to apply various tasks on a file. It does not require any different package; the package consists of all file classes and allows its users to work with different file formats.


A stream is defined as the order or progression of objects that are required to support a wide range of

objects. This idea was first presented in Java 8 and is still used today. Java Stream has the following features:

  • Instead of being a data structure, a stream accepts input from Collections, Arrays, and I/O Channels.
  • It does not alter the original data structure; instead, they deliver the result as specified by the pipelined methods.

Before delving into the various input and output streams available in Java, let's take a look at three standard or default streams that are also the most commonly used:

  1. System. In: It is used to read characters entered by the user via the keyboard.
  2. System. Out: It is used to display the output of a program on a display device which is fulfilled by implementing the print() method.
  3. System.err: It displays all of the error data generated by a program on a display device like a computer screen.

With the help of the code below, we can better grasp how and System.out work.


We have used the Scanner class to take input in the above code.

Scanner sc=  new Scanner (

The above-highlighted line, which is used in the program at line number eight, is a Scanner class that can pass primitive types and strings using regular expressions where represents the user’s keyboard.

String a =

The above-highlighted line, which is used in the program at line number ten, takes the input from the user, which is in the configuration of String (in the above case).

We have used the print() method to print the input taken from the user and other text which we want to print. Following is the output of the code.


We have used two types of print: print (parameter) and println(parameter). When using the print() method, the cursor remains at the end of the text, while in the case of println, the cursor moves to the new line. Let's understand this with the following example.


First, we printed a space so that our output looked a bit nice.

Then we have printed 4 keywords in a row.

Inline no. 13, the cursor goes to a new line and print some space, and after line no.16, the cursor again goes to a new line and print "hello everyone". To understand more precisely, let's look at the output of the above code.


Types of Stream

Java provides two types of stream, which are explained below:

1. InputStream: Its purpose is to read data. Useful methods of InputStream are as follows.

  • Public abstract int read() throws an exception: It reads the next data byte.
  • Public it available() throws an exception: Its function is to estimate the byte used to read from the input stream.
  • Public void close() throws an exception: It closes the present input stream as the name suggests.

2. OutputStream: Its purpose is to write data. Useful methods of OutputStream are as follows.

  • Public void write(int) throws an exception: It is used to write a byte in the present output stream.
  • Public void writes ( a[] )throws an exception: As the parameter suggests, it writes an array of bytes to the present output stream.
  • Public void flush() throws an exception: It flushes the present output stream.
  • Public void close() throws an exception: As the name suggests, the above method closes the present output stream.

Features I/O Streams

I/O stream is a powerful idea that significantly simplifies I/O operations. The package consists of all the necessary classes to perform I/O operations. Let's discuss different types and features I/O streams offer a java user.

  • Byte Streams: It is implemented to manage the input-output of raw binary data.
  • Character Streams: It is implemented to manage the input-output of character data.
  • Buffered Stream: It is used for optimizing input and output data.
  • Scanning and formatting: The program can perform two functions: reading and writing.
  • Data streams are implemented to manage binary input-output from primitive and String data types.
  • Object Streams: As the name suggests, it manages the Input-output of objects. Classes

The most important classes are as follows:

  • BufferedInputStream
  • BufferedOutputStream
  • BufferedReader
  • BufferedWriter
  • ByteArrayInputStream
  • ByteArrayOutputStream
  • CharArrayReader
  • CharArrayWriter
  • Console
  • DataInputStream –
  • DataOutputStream
  • File
  • FileDescriptor
  • FileInputStream
  • FileOutputStream
  • FilePermission
  • FileReader and FileWriter
  • FilterInputStream
  • FilterOutputStream
  • FilterReader
  • FilterWriter
  • InputStream
  • InputStreamReader
  • LineNumberInputStream
  • LineNumberReader
  • ObjectInputStream
  • ObjectInputStream.GetField
  • ObjectOutputStream
  • ObjectOutputStream.PutField
  • ObjectStreamClass
  • ObjectStreamField
  • OutputStream
  • OutputStreamWriter
  • PipedInputStream
  • PipedOutputStream
  • PipedReader
  • PipedWriter
  • PrintStream
  • PrintWriter
  • PushbackInputStream
  • PushbackReader
  • RandomAccessFile
  • Reader
  • SequenceInputStream
  • SerializablePermission
  • StreamTokenizer
  • StringBufferInputStream
  • StringReader
  • StringWriter
  • Writer
  • ZipInputStream class in Java
  • ZipEntry class in Java
  • JarEntry class in Java
  • ZipOutputStream class in Java
  • Zip.InflaterInputStream class in Java
  • Zip.DeflaterInputStream class in Java
  • Zip.DeflaterOutputStream class in Java