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Java HOME Java Intro Java Get Started Java Syntax

Syntax Statements Code Challenge

Print Text Print Numbers Code Challenge

Java Comments Java Variables

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Java Data Types

Data Types Numbers Booleans Characters Real-Life Example Non-primitive Types The var Keyword Code Challenge

Java Type Casting Java Operators

Operators Arithmetic Assignment Comparison Logical Precedence Code Challenge

Strings Concatenation Numbers and Strings Special Characters Code Challenge

Java Math Java Booleans

Booleans Real-Life Example Code Challenge

if else else if Short Hand If...Else Nested If Logical Operators Real-Life Examples Code Challenge

Switch Code Challenge

Java While Loop

While Loop Do/While Loop Real-Life Examples Code Challenge

For Loop Nested Loops For-Each Loop Real-Life Examples Code Challenge

Java Break/Continue Java Arrays

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Java Methods

Java Methods Java Method Challenge Java Method Parameters

Parameters Return Values Code Challenge

Java Method Overloading Java Scope Java Recursion

Java Classes

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Java Encapsulation Java Packages / API Java Inheritance Java Polymorphism Java super Keyword Java Inner Classes Java Abstraction Java Interface Java Anonymous Java Enum

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Java Errors

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Java File Handling

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Java I/O Streams

Java I/O Streams Java FileInputStream Java FileOutputStream Java BufferedReader Java BufferedWriter

Java Data Structures

Java Data Structures Java Collections Java List Java ArrayList Java LinkedList Java List Sorting Java Set Java HashSet Java TreeSet Java LinkedHashSet Java Map Java HashMap Java TreeMap Java LinkedHashMap Java Iterator Java Algorithms

Java Advanced

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Java How To's

How Tos Add Two Numbers Swap Two Variables Even or Odd Number Reverse a Number Positive or Negative Square Root Area of Rectangle Celsius to Fahrenheit Sum of Digits Check Armstrong Num Random Number Count Words Count Vowels in a String Remove Vowels Count Digits in a String Reverse a String Palindrome Check Check Anagram Convert String to Array Remove Whitespace Count Character Frequency Sum of Array Elements Find Array Average Sort an Array Find Smallest Element Find Largest Element Second Largest Array Min and Max Array Merge Two Arrays Remove Duplicates Find Duplicates Shuffle an Array Factorial of a Number Fibonacci Sequence Find GCD Check Prime Number ArrayList Loop HashMap Loop Loop Through an Enum

Java Reference

Java Reference Java Keywords

assert abstract boolean break byte case catch char class continue default do double else enum exports extends final finally float for if implements import instanceof int interface long module native new package private protected public return requires short static super switch synchronized this throw throws transient try var void volatile while

Java String Methods

charAt() codePointAt() codePointBefore() codePointCount() compareTo() compareToIgnoreCase() concat() contains() contentEquals() copyValueOf() endsWith() equals() equalsIgnoreCase() format() getBytes() getChars() hashCode() indexOf() isEmpty() join() lastIndexOf() length() matches() offsetByCodePoints() regionMatches() replace() replaceAll() replaceFirst() split() startsWith() subSequence() substring() toCharArray() toLowerCase() toString() toUpperCase() trim() valueOf()

Java Math Methods

abs() acos() addExact() asin() atan() atan2() cbrt() ceil() copySign() cos() cosh() decrementExact() exp() expm1() floor() floorDiv() floorMod() getExponent() hypot() IEEEremainder() incrementExact() log() log10() log1p() max() min() multiplyExact() negateExact() nextAfter() nextDown() nextUp() pow() random() rint() round() scalb() signum() sin() sinh() sqrt() subtractExact() tan() tanh() toDegrees() toIntExact() toRadians() ulp()

Java Output Methods

print() printf() println()

Java Arrays Methods

compare() equals() sort() fill() length

Java ArrayList Methods

add() addAll() clear() clone() contains ensureCapacity() forEach() get() indexOf() isEmpty() iterator() lastIndexOf() listIterator() remove() removeAll() removeIf() replaceAll() retainAll() set() size() sort() spliterator() subList() toArray() trimToSize()

Java LinkedList Methods

add() addAll() clear() clone() contains forEach() get() getFirst() getLast() indexOf() isEmpty() iterator() lastIndexOf() listIterator() remove() removeAll() removeFirst() removeIf() removeLast() replaceAll() retainAll() set() size() sort() spliterator() subList() toArray()

Java HashMap Methods

clear() clone() compute() computeIfAbsent() computeIfPresent() containsKey() containsValue() entrySet() forEach() get() getOrDefault() isEmpty() keySet() merge() put() putAll() putIfAbsent() remove() replace() replaceAll() size() values()

Java Scanner Methods

close() delimiter() findInLine() findWithinHorizon() hasNext() hasNextBoolean() hasNextByte() hasNextDouble() hasNextFloat() hasNextInt() hasNextLine() hasNextLong() hasNextShort() locale() next() nextBoolean() nextByte() nextDouble() nextFloat() nextInt() nextLine() nextLong() nextShort() radix() reset() useDelimiter() useLocale() useRadix()

Java File Methods Java FileInputStream Java FileOutputStream Java BufferedReader Java BufferedWriter Java Iterator Methods Java Collections Methods Java System Methods Java Errors & Exceptions

Java Examples

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Java How To Find the Square Root of a Number

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Square Root of a Number

You can use Math.sqrt() to find the square root of a number:

Example

Find the square root of 64:

Math.sqrt(64);

Try it Yourself »

Related Pages

Java Math Tutorial

Java Math Reference

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