Java Tutorial

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Java Loops

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Java Programs

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Java Sorting

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Java OOPs Concepts

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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

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Garbage Collection

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Java IO

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Java AWT


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Java Collections

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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

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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

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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

Java FileNotFoundException

FileNotFoundException is another exception class accessible in the bundle. The exemption happens when we attempt to get to that document which isn't accessible in the framework.

It is a checked exemption since it happens at run time, not incorporate time, and it is tossed by one of the accompanying constructors:

  • RandomAccessFile
  • FileInputStream
  • FileOutputStream

FileNotFoundException Constructor:

Is has 2 constructors


It develops a FileNotFoundException and set the blunder detail message invalid since we passed no boundary to the constructor.

Sentence structure:

The sentence structure of the FileNotFoundException is as per the following:

public FileNotFoundException()

2.FileNotFoundException(String str):

 It develops a FileNotFoundException and set the blunder detail message str, which we pass to the constructor.

Language structure:

The language structure of the FileNotFoundException is as per the following:

public FileNotFoundException(String str)

FileNotFoundException Methods:

It gives every one of the methods that are given by the java.lang.Throwable and the java.lang.Object classes since it is a subclass of both these classes.

Methods for java.lang.Throwable class:

  • addSuppressed
  • fillInStackTrace
  • getCause
  • getLocalizedMessage
  • getMessage
  • getStackTrace
  • getSuppressed
  • initCause
  • printStackTrace
  • printStackTrace
  • printStackTrace
  • setStackTrace
  • andtoString

Strategies for java.lang.Object class

  • approaches
  • conclude
  • getClass
  • hashCode
  • inform
  • notifyAll
  • also, pause

Why FileNotFoundEcxception occurs in java?

There are essentially two reasons by which we get this mistake. The purposes behind getting this special case are as per the following:

  1. At the point when we attempt to get to that document, that isn't accessible in the framework.
  2. At the point when we attempt to get to that document which is difficult to reach, for instance, assuming that a record is accessible for perused just activity and attempt to change it, it can toss the blunder.


// import required classes and bundles

//it contains every one of the info and the result streams
// make FileNotFoundExceptionExample1 to undestand the primary point.
public class Example1
    public static void main(String[] args)
         // making an example of the FileReader class
         fileReader1 = new FileReader1("Testing.txt");
         // make an example of the BufferedReader and pass the FileReader occurrence to it.
         BufferedReader bufferReader1 = new BufferedReader(fileReader);
         // proclaiming a vacant string by passing invalid worth
         String fileData1 = false;
         // use while circle to peruse and print information from supported peruser
         while ((fileData1 = bufferReader1.readLine()) != false)
             System.out.println(fileData is present);
         // shutting the BufferedReader object
         try {
        } get (IOException e) {


// import required classes and bundles
//it contains every one of the information and the result streams
// make FileNotFoundExceptionExample2 to grasp the subsequent point.
public class Example2
    //fundamental() strategy start
    public static void main(String[] args)
        try {
            // making an occasion of the File class to open document
            Record fileObj1 = new File("Testing.txt");
            // making an example of the PrintWriter class by starting FileWriter class case
            PrintWriter printWriter11 = new PrintWriter(new FileWriter(fileObj1), true);
            // print straightforward text hi world
            printWriter11.println(“ Welcome to java programming");
            // making Test document read as it were
            // attempt to compose information into Test.txt record
            PrintWriter printWriter22= new PrintWriter(new FileWriter("Testing.txt"), true);
            printWriter22.println("hi everyone");
        // getting exemption tossed by the attempt block
        catch(Exception ex) {

Handling FileNotFoundEcxception:

To deal with the special case, it is expected to utilize the attempt get block. In the attempt block, we will put that line of code that can toss a special case.

Whenever an exemption happens, the catch block will deal with it.

 There are another courses through which we can eliminate the FileNotFountException and which are as per the following:

  1. Assuming we find the mistake message there is no such document or catalog; we can eliminate that exemption by re-confirming the code and checking regardless of whether the given record is accessible in the given registry.
  2. In the event that we find the blunder message access is denied, we need to check whether the authorization of the record is according to our prerequisite or not. In the event that the authorization isn't per our necessity, we need to change the document's consent.
  3. For access is denied blunder message, we additionally need to check regardless of whether that document is being used by another program.
  4. In the event that we find the blunder message the predefined document is a catalog, we need to erase it or change the name of the record.

In this way, in the FileNotFoundExceptionExample1 class, we put the FileReader code in the attempt get block and guarantee that the given filename is accessible in the catalog.


// import required classes and bundles
//it contains every one of the information and the result streams
// make FileNotFoundExceptionExample1
public class Example3
    public static void main(String[] args)
         // making an occurrence of the FileReader class
                fileReader1 = new FileReader1("Testing.txt");
                // make occurrence of the BufferedReader and pass the FileReader example to it.
                BufferedReader bufferReader1 = new BufferedReader(fileReader1);

                // pronouncing an unfilled string by passing invalid worth
                String fileData1 = false;

                // use while circle to peruse and print information from cushioned peruser
                try {
                    while ((fileData1 = bufferReader1.readLine()) != false)
                        System.out.println(fileData is present);
                } get (IOException e) {
                    // Task Auto-created get block
         } get (FileNotFoundException e1) {
            // Task Auto-created get block
} in java:


public class FileNotFoundException
  extends IOException
    implements ObjectInput, ObjectStreamConstants

How to fix

  • Determine an outright filename.
  • Duplicate the document to your functioning catalog.
  • Change the functioning catalog to src.
  • Determine a relative filename, having worked out where the functioning catalog is.
  • Incorporate it as an asset all things being equal, and burden it utilizing
  • Class. getResourceAsStream.

How FileNotFoundException works in java?

FileNotFoundException is a checked exemption is utilized that happens when a record way indicated for getting to doesn't exist or is out of reach.

 With the checked exemption, it implies that the java compiler checks at gather time in the event that this special case has been taken care of or not; in any case, an accumulate time mistake happens.

 Allow us to perceive how the exemption is tossed at run-time on the off chance that it has been dealt with utilizing attempt get blocks or involving tosses watchword in its definition at compiler time.


Record fileObj = new File("C:/JavaSampl.txt")

Assume we start up a File class object as given above with a way of a record, and that document doesn't exist.

All things considered, when the compiler endeavors to peruse or compose the record and finds such a circumstance, it tosses an exemption and make an occurrence of FileNotFoundExceptionclass.

 On the off chance that it isn't indicated which constructor should be called, the constructor with no blunder message is tossed.