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To'sJava How TosHow TosAdd Two NumbersSwap Two VariablesEven or Odd NumberReverse a NumberPositive or NegativeSquare RootArea of RectangleCelsius to FahrenheitSum of DigitsCheck Armstrong NumRandom NumberCount WordsCount Vowels in a StringRemove VowelsCount Digits in a StringReverse a StringPalindrome CheckCheck AnagramConvert String to ArrayRemove WhitespaceCount Character FrequencySum of Array ElementsFind Array AverageSort an ArrayFind Smallest ElementFind Largest ElementSecond Largest ArrayMin and Max ArrayMerge Two ArraysRemove DuplicatesFind DuplicatesShuffle an ArrayFactorial of a NumberFibonacci SequenceFind GCDCheck Prime NumberArrayList LoopHashMap LoopLoop Through an EnumJava ReferenceJava ReferenceJava 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 whileJava 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() lengthJava 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 MethodsJava FileInputStreamJava FileOutputStreamJava BufferedReaderJava BufferedWriterJava Iterator MethodsJava Collections MethodsJava System MethodsJava Errors & ExceptionsJava ExamplesJava ExamplesJava VideosJava CompilerJava ExercisesJava QuizJava Code ChallengesJava Practice ProblemsJava ServerJava SyllabusJava Study PlanJava Interview Q&A Java Tutorial❮ HomeNext ❯ Learn Java Java is one of the world's most widely used programming languages. 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You can edit Java code and view the result in your browser.Examplepublic class Main { public static void main(String[] args) { System.out.println("Hello World"); }}Try it Yourself »ExercisesMany chapters in this tutorial end with an exercise where you can check your level of knowledge.See all Java ExercisesWhat You'll LearnThis tutorial will guide you step by step, with examples and exercises along the way: Java syntax and basic structure Variables, data types, and operators Conditions and loops Methods and parameters Arrays and strings Object-oriented programming Classes, objects, inheritance, and polymorphism Exception handling File handling Collections and useful built-in classes Java Quiz Check your understanding with a short quiz and see how well you know Java. Start Java Quiz Learn by Examples Learn by examples! This tutorial supplements all explanations with clarifying examples. 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You can study at W3Schools without creating an account.Java ReferenceYou will also find complete keyword and method references: Reference Overview Java Keywords String Methods Math Methods Output Methods Arrays Methods ArrayList Methods LinkedList Methods HashMap Methods Scanner Methods File Methods FileInputStream FileOutputStream BufferedReader BufferedWriter Iterator Methods Collections Methods System Methods Errors & Exceptions Course Certification Get Certified in coding Complete the W3Schools coding course, strengthen your knowledge, and earn a certificate you can add to your CV, portfolio, and LinkedIn profile. Get Certified Today W3Schools Certificate Coding Learn it. Practice it. Prove it. w 3 s c h o o l s C E R T I F I E D . 2 0 2 6 ❮ HomeNext ❯ ★ +1 Sign in to track progress REMOVE ADS New W3Schools Adventure App Coding fundamentals as a game. Bite-sized lessons and challenges. Download on the App Store GET IT ON Google Play Learn more » Ready to start your journey? 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Java Tutorial

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