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ongodb r go kotlin sass scipy bash rust all our services dark mode services filter input w3schools offers a wide range of services and products for beginners and professionals helping millions of people everyday to learn and master new skills free tutorials enjoy our free tutorials like millions of other internet users since 1999 references explore our selection of references covering all popular coding languages w3schools app new for ios android start a new learning adventure create a website create your own website with w3schools spaces no setup required exercises test your skills with different exercises quizzes test yourself with multiple choice questions code challenges test your skills with interactive code challenges get certified document your knowledge log in sign up create an account to track your progress league earn xp and climb the ranks with different challenges upgrade become a plus user and unlock powerful features ad free hosting support where to start not sure where you want to start follow our guided path code editor try it with our online code editor you can edit code and view the result in your browser templates we have created a bunch of responsive website templates you can use for free web hosting host your own website and share it to the world with w3schools spaces create a server create your own server using python php react js node js java c etc how to s large collection of code snippets for html css and javascript css framework build fast and responsive sites using our free w3 css framework videos learn the basics of html in a fun and engaging video tutorial browser statistics read long term trends of browser usage typing speed test your typing speed color picker use our color picker to find different rgb hex and hsl colors newsletter join our newsletter and get access to exclusive content every month emojis reference check out our refererence page with all the emojis supported in html code game w3schools coding game help the lynx collect pine cones utf 8 reference check out our full utf 8 character reference community chat learn and connect with us on discord academy contact us about w3schools academy for educational institutions for businesses contact us about w3schools academy for your organization contact us about sales sales w3schools com about errors help w3schools com html css javascript sql python java php c c c aws w3 css how to bootstrap react mysql jquery excel xml django numpy pandas nodejs dsa typescript angular angularjs git postgresql mongodb asp ai r go kotlin swift sass vue gen ai scipy cybersecurity data science intro to programming intro to html css bash rust tools java tutorial java home java intro java get started java syntax syntax statements code challenge java output print text print numbers code challenge java comments java variables variables print variables multiple variables identifiers constants final real life examples code challenge 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 java strings strings concatenation numbers and strings special characters code challenge java math java booleans booleans real life example code challenge java if else if else else if short hand if else nested if logical operators real life examples code challenge java switch switch code challenge java while loop while loop do while loop real life examples code challenge java for loop for loop nested loops for each loop real life examples code challenge java break continue java arrays arrays loop through an array real life examples multidimensional arrays code challenge java methods java methods java method challenge java method parameters parameters return values code challenge java method overloading java scope java recursion java classes java oop java classes objects java class attributes java class methods java class challenge java constructors java this keyword java modifiers access modifiers non access modifiers java encapsulation java packages api java inheritance java polymorphism java super keyword java inner classes java abstraction java interface java anonymous java enum enums enum constructor java user input java date java errors java errors java debugging java exceptions java multiple exceptions java try with resources java file handling java files java create files java write files java read files java delete files 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 java wrapper classes java generics java annotations java regex java threads java lambda java advanced sorting java projects java projects java cert java certificate java how to s java how tos 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 java examples java videos java compiler java exercises java quiz java code challenges java practice problems java server java syllabus java study plan java interview q a java examples previous next share link copied java syntax create a simple hello world program syntax explained java comments single line comment before a line of code single line comment at the end of a line of code multi line comment comments explained java variables create a string variable create an integer variable create a variable without assigning the value and assign the value later overwrite an existing variable value create a final variable unchangeable and read only combine text and a variable on display add a variable to another variable declare many variables of the same type with a comma separated list variables explained java data types a demonstration of different data types in java create a byte type create a short type create an int type create a long type create a float type create a double type create a boolean type create a char type create a string type data types explained java type casting widening casting narrowing casting type casting explained java operators addition operator subtraction operator multiplication operator division operator modulus operator increment operator decrement operator assignment operator comparison operator logical operator operators explained java strings create a string quotes inside a string find the length of a string using methods to convert strings to uppercase and lowercase finding a string in a string string concatenation if you add a number and a string the result will be a string concatenation strings explained java math math max x y return the highest value of x and y math min x y return the lowest value of x and y math sqrt x return the square root of x math abs x return the absolute positive value of x math random return a random number between 0 and 1 math explained java booleans create a boolean type find out if an expression is true or false use the equal to operator to evaluate a boolean expression booleans explained java if else conditions the if statement the else statement the else if statement if else explained java switch the switch statement the switch statement with a default keyword switch explained java loops while loop do while loop for loop for each loop break a loop continue a loop loops explained java arrays create and access an array change an array element find the length of an array access an array loop through an array loop through an array with for each multidimensional array loop through a multidimensional array arrays explained java methods create and call a method call a method multiple times method with parameters method with multiple parameters return value a method with if else method overloading recursion recursive function with a halting condition methods explained java classes and objects create a class and an object of a class create multiple objects of a class accessing class attributes variables modify attributes override existing attribute values multiple attributes create a class method method with parameters access class methods with an object create a class constructor constructor with parameters classes and objects explained java modifiers public class default class public attributes private attributes default attributes protected attributes final class abstract class with abstract methods modifiers explained java encapsulation java encapsulation getters and setters encapsulation explained java packages import a class from the java api import a package from the java api create a package packages explained java inheritance java inheritance extends java polymorphism inheritance explained java inner classes inner class private inner class error when trying to access it from an outside class static inner class access outer class from inner class inner classes explained java abstraction interfaces java abstract classes and methods java interface implements multiple interfaces interfaces explained java enums create an enum with a group of constants an enum inside a class an enum in a switch statement loop through an enum enums explained java user input read user input read user input of various types user input explained java dates display current date display current time display current date and time formatting date and time dates explained java arraylist create an arraylist access an item in an arraylist remove an item from an arraylist remove all items from an arraylist get the size of an arraylist loop through an arraylist loop through an arraylist with for each create an arraylist that should store numbers integers arraylist explained java hashmap create a hashmap access an item in a hashmap remove an item from a hashmap remove all items from a hashmap get the size of a hashmap loop through a hashmap create a hashmap that should store string keys and integer values hashmap explained java hashset create a hashset and add items to it check if an item exists in a hashset remove an item from a hashset remove all items from a hashset get the size of a hashset loop through a hashset create a hashset that should store integer values hashset explained java iterator getting an iterator looping throug a collection removing items from a collection iterator explained java wrapper classes create an arraylist that should store numbers integers create wrapper objects using wrapper methods convert wrapper objects to strings wrapper classes explained java exceptions try catch the try catch statement the finally statement the throw statement exceptions explained java regular expressions search for the word w3schools in a sentence regular expressions explained java threads running a thread by extending the thread class running a thread by implementing the runnable interface concurrency problems avoid concurrency problems threads explained java files create a file write to a file read a file get file information delete a file files explained previous next 1 sign in to track progress remove ads learn more about adventure mode free account track your progress xp earned 0 day streak 0 spaces 0 league sign in to track progress new learn in adventure mode w3schools adventure app coding fundamentals as bite sized lessons and challenges download on the app store get it on google play try now in browser plus spaces get certified for teachers practice contact us contact sales if you want to use w3schools services as an educational institution team or enterprise send us an e mail sales w3schools com report error if you want to report an error or if you want to make a suggestion send us an e mail help w3schools com 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