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Java Tutorial

Java HOME Java Intro Java Get Started Java Syntax

Syntax Statements Code Challenge

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

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

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 Cert

Java Certificate

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

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 int Keyword

❮ Java Keywords

Example

int myNum = 100000;
System.out.println(myNum);

Try it Yourself »

Definition and Usage

The int keyword is a data type that can store whole numbers from -2147483648 to 2147483647.

Related Pages

Read more about data types in our Java Data Types Tutorial.

❮ Java Keywords

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