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Java Basics
Java Tutorial
Java Installation
Java HelloWorld Program
Java Program Structure
Java Data Types
- byte
- short
- int
- long
- float
- double
- boolean
- char
Java Variables
- Java Variable Types
Java Access Modifiers
Java Operators
- Arithmetic Operators
- Assignment Operators
- Relational Operators
- Logical Operators
- Bitwise Operators
Java Decision Making
- If statement
- If-Else statement
- If-Else-If statement
- Switch statement
Java Loops
- Java While Loop
- Java Do-while Loop
- Java For Loop
- Java ForEach
- Java Break
- Java Continue
- Nested While Loop
- Nested For Loop
- Infinite While Loop
- Infinite For Loop
Java Array
- Java Array
- Print array
- Initialize array
- Array of integers
- Array of strings
- Array of objects
- Array of arrays
- Iterate over array
- Array For loop
- Array while loop
- Append element to array
- Check if array is empty
- Array average
- Check if array contains
- Array ForEach
- Array - Find Index of Item
- Array sum
- Concatenate arrays
- Find smallest number in array
- Find largest number in array
- Array reverse
Java OOPs
- Classes and Objects
- Inheritance
- Polymorphism
- Method Overloading
- Method Overriding/
- Abstraction
- Abstract methods and classes
- Interfaces
- Encapsulation
- Polymorphism
Java String
- Basics
- Print string
- Read string from console
- Create string from Char array
- Create string from Byte array
- Concatenate two strings
- Get index of the first Occurrence of substring
- Get index of nth occurrence of substring
- Checks
- Check if two strings are equal
- Check if string ends with specific suffix
- Check if string starts with specific prefix
- Check if string is blank
- Check if string is empty
- Check if string contains search substring
- Validate if string is a Phone Number
- Character Level
- Get character at specific index in string
- Get first character in string
- Get last character from string
- Transformations
- Replace first occurrence of string
- Replace all occurrences of a string
- Join strings
- Join strings in string array
- Join strings in ArrayList
- Reverse a string
- Trim string
- Split string
- Remove whitespaces in string
- Replace multiple spaces with single space
- Comparisons
- Compare strings lexicographically
- Compare String and CharSequence
- Compare String and StringBuffer
Java Exception Handling
Java Type Conversions
- Convert string to int
- Convert string to float
- Convert string to double
- Convert string to long
- Convert string to boolean
- Convert int to string
- Convert int to float
- Convert int to double
- Convert int to long
- Convert int to char
- Convert float to string
- Convert float to int
- Convert long to string
- Convert double to string
- Convert boolean to string
Java File Operations
- Create a file
- Read file as string
- Write string to file
- Copy File
- Delete File
- Rename File
- Download File from URL
- Replace a String in File
- Filter list of files or directories
- Check if file is readable
- Check if file is writable
- Check if file is executable
- Read contents of a file line by line using BufferedReader
- Read contents of a File line by line using Stream
Java Programs
- Check if n is positive or negative
- Read integer from console
- Add two integers
- Count digits in number
- Largest of three numbers
- Smallest of three numbers
- Even numbers
- Odd numbers
- Reverse a number
- Prime Number
- Factorial
- Print All Prime Numbers
- Factors of a Number
- Check Palindrome number
- Check Palindrome string
- Swap two numbers
- Even or Odd number
Java Classes
Java ArrayList
- ArrayList add()
- ArrayList addAll()
- ArrayList clear()
- ArrayList clone()
- ArrayList contains()
- ArrayList ensureCapacity()
- ArrayList forEach()
- ArrayList get()
- ArrayList indexOf()
- ArrayList isEmpty()
- ArrayList iterator()
- ArrayList lastIndexOf()
- ArrayList listIterator()
- ArrayList remove()
- ArrayList removeAll()
- ArrayList removeIf()
- ArrayList removeRange()
- ArrayList retainAll()
- ArrayList set()
- ArrayList size()
- ArrayList spliterator()
- ArrayList subList()
- ArrayList toArray()
- ArrayList trimToSize()
Java HashMap
- HashMap clear()
- HashMap clone()
- HashMap compute()
- HashMap computeIfAbsent()
- HashMap computeIfPresent()
- HashMap containsKey()
- HashMap containsValue()
- HashMap entrySet()
- HashMap get()
- HashMap isEmpty()
- HashMap keySet()
- HashMap merge()
- HashMap put()
- HashMap putAll()
- HashMap remove()
- HashMap size()
- HashMap values()
Java HashSet
- HashSet add()
- HashSet clear()
- HashSet clone()
- HashSet contains()
- HashSet isEmpty()
- HashSet iterator()
- HashSet remove()
- HashSet size()
- HashSet spliterator()
Java Integer
- Integer bitCount()
- Integer byteValue()
- Integer compare()
- Integer compareTo()
- Integer doubleValue()
- Integer equals()
- Integer floatValue()
- Integer getInteger()
- Integer intValue()
- Integer longValue()
- Integer max()
- Integer min()
- Integer reverse()
- Integer reverseBytes()
- Integer rotateLeft()
- Integer rotateRight()
- Integer shortValue()
- Integer signum()
- Integer sum()
- Integer toBinaryString()
- Integer toHexString()
- Integer toOctalString()
- Integer toString()
Java StringBuilder
- StringBuilder append()
- StringBuilder appendCodePoint()
- StringBuilder capacity()
- StringBuilder charAt()
- StringBuilder chars()
- StringBuilder codePointAt()
- StringBuilder codePointBefore()
- StringBuilder codePointCount()
- StringBuilder codePoints()
- StringBuilder delete()
- StringBuilder deleteCharAt()
- StringBuilder ensureCapacity()
- StringBuilder getChars()
- StringBuilder indexOf()
- StringBuilder insert()
- StringBuilder lastIndexOf()
- StringBuilder length()
- StringBuilder offsetByCodePoints()
- StringBuilder replace()
- StringBuilder reverse()
- StringBuilder setCharAt()
- StringBuilder setLength()
- StringBuilder subSequence()
- StringBuilder substring()
- StringBuilder toString()
- StringBuilder trimToSize()
Java java.util.Arrays
- Arrays.asList()
- Arrays.copyOf()
- Arrays.sort()
Java Random
- Random doubles()
- Random ints()
- Random longs()
- Random next()
- Random nextBoolean()
- Random nextBytes()
- Random nextDouble()
- Random nextFloat()
- Random nextGaussian()
- Random nextInt()
- Random nextLong()
- Random setSeed()
Java Math
- Math abs
- Math acos
- Math asin
- Math atan
- Math cbrt
- Math ceil
- Math cos
- Math cosh
- Math exp
- Math floor
- Math hypot
- Math log
- Math max
- Math min
- Math pow
- Math random
- Math round
- Math rint
- Math signum
- Math sin
- Math sinh
- Math sqrt
- Math tan
- Math tanh
- Math toDegrees
- Math toRadians
Advanced
Java Date & Time
Java MySQL

Java – Get File Size

In this tutorial, you will learn how to get the size of a file in Java, using size() method of java.nio.file.Files class.

Java – Get file size

To get the size of a file given by a path in Java, prepare Path object for the given file, call size() method of the java.nio.file.Files class and pass the file path object as argument to the method. The size() method returns a number (of long type) representing the size of the given file.

If filePath is the given file path, then use the following expression to get the size of file.

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Copy

Files.size(filePath)

1. Get the size of file “data.txt” in Java

In the following program, we take a file path "/Users/tutorialkart/data.txt", get the size of this file, and print the size to standard output.