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

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

Serialization

Java Serialization Java transient

Networking

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

AWT

Java AWT

Swing

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

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

Misc

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 File

Java file class implements the concept of file handling. It has several methods, such as deleting, creating, reading, and updating files. This class allows java users to perform various operations on files and directories. It is a representation of file and directory pathnames that is abstract. Instances of the File class are immutable, which means that once generated, a File object's abstract pathname will never change. This class comes under the java.io package, and it implements the following interfaces.

  • Serializable
  • Comparable<File>

File and Directory

A file is a name for a location where relevant data can be saved. And a directory is a part or place in your computer’s memory where you can store files. It is implemented to perform two functions: to store other directories ( known as subdirectories) and helps keep the computer organized.

File Class Constructors

File class provides the following constructors, such as:

1

File(Filepnt, String cld)

This constructor is implemented when there is a need to create a new file instance that must include the following parameters: parent abstract pathname and a child pathname string.

2

File(Stringpathn)

When a new File instance must be created, this constructor is implemented to turn the provided pathname string into an abstract pathname.

3

File(String pnt, String cld)

This constructor is implemented when there is a need to create a new file instance must be created by using three parameters: string, parent pathname, and child pathname.

4

File(URI u)

This constructor is used when a new file instance has to be generated by transforming the following parameters: URI into an abstract pathname.

File Class Methods

File class provides the following methods.

  1. canExecute()

This function is implemented when it is necessary to check whether the application can carry out its function to execute the file represented by this abstract pathname. This method has a boolean return type.

  1. canRead()

This function is implemented when it is necessary to check whether the application can carry out its function to read the file represented by this abstract pathname. This method has a boolean return type.

  1. canWrite()

This function is implemented when it is necessary to check whether the application can carry out its function to update the file represented by this abstract pathname. This method has a boolean return type.

  1. compareTo(Filepname)

This method is implemented when there is a need to differentiate two abstract pathnames lexicographically. This method has an int return type.

  1. createNewFile()

This method is implemented when there is a need to generate a new empty file, represented by this abstract pathname. This method has a boolean return type.

  1. createTempFile(String pf, String sf )

This method is implemented when there is a need to generate a new file that is empty and has a default temporary-file directory. This method has a file return type.

  1. delete()

This method is implemented when there is a need to delete the file or directory represented by this abstract pathname. This method has a boolean return type.

  1. equals(Object o)

This method is implemented when there is a need to examine the abstract pathname for equality with the specified object. This method has a boolean return type.

  1. exists()

This method is implemented when there is a need to examine whether the file or directory denoted by this abstract pathname exists. This method has a boolean return type.

  1. getAbsolutePath()

This function is implemented when the absolute pathname string of this abstract pathname must be returned. This method has a String return type.

  1. list()

As its name implies, this method produces an array of strings naming the files and folders in the directory. This method has a String[ ] return type.

  1. getFreeSpace()

This function is used when the number of unallocated bytes in the partition must be returned. This method has a long return type.

  1. getName()

This method is implemented when there is a need to return the file or directory name denoted by this abstract pathname. This method has a String return type.

  1. getParent()

This method is implemented when there is a need to return the pathname string of this abstract pathname’s parent. This method has a String return type.

  1. getParentFile()

This method is implemented when there is a need to return the abstract pathname of this abstract pathname’s parent. This method has a String return type.

  1. getPath()

This method is implemented when there is a need to convert this abstract pathname into a pathname string. This method has a String return type.

  1. setReadOnly()

This method is implemented when there is a need to mark the file or directory name, ensuring that only read operations can be implemented. This method has a boolean return type.

  1. isDirectory()

This method is implemented when there is a need to examine the file denoted by this pathname as a directory. This method has a String return type.

  1. isFile()

This method is implemented when there is a need to examine the file denoted by this abstract pathname as a normal file. This method has a String return type.

  1. isHidden()

This method is implemented when there is a need to examine whether the file represented by this abstract pathname is hidden. This method has a String return type.

  1. length( )

As the function's name implies, this function returns the length. The length belongs to the file denoted by this abstract pathname. This method has a long return type.

  1. listFiles( )

This function returns an array that belongs to the abstract pathnames, which indicate the particular files in the directory. This method has a file[ ] return type.

  1. mkdir()

This function generates a  directory named by this abstract pathname. This method has a String return type.

  1. renameTo(File dt )

As the name implies, this function renames the file represented by this abstract pathname. This method has a boolean return type.

  1. setExecutable(boolean executable)

This function is a  quick way to change the owner's execute permission. This method has a String return type.

  1. setReadable(boolean readable)

This function is a  quick way to change the owner's read permission. This method has a String return type.

  1. setReadable(boolean rd, boolean only)

This function is a  quick way to change the owner's, or everybody’s read permission. This method has a boolean return type.

  1. setWritable(boolean w)

This function is a  quick way to change the owner's write permissions. This method has a boolean return type.

  1. toString()

This method is implemented when there is a need to return the pathname, which is a string type belonging to this abstract pathname. This method has a String return type.

  1. toURI()

This method is implemented when it's necessary to produce a file URI that indicates this abstract pathname. This method has a URI return type.



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