Movatterモバイル変換

[0]ホーム
URL:

Menu
×
See More 
Sign In
★+1 Get Certified Upgrade For Teachers Spaces Get Certified Upgrade For Teachers Spaces
   ❮     
     ❯   

Java Tutorial

Java HOMEJava IntroJava Get StartedJava SyntaxJava OutputJava CommentsJava VariablesJava Data TypesJava Type CastingJava OperatorsJava StringsJava MathJava BooleansJava If...ElseJava SwitchJava While LoopJava For LoopJava Break/ContinueJava Arrays

Java Methods

Java MethodsJava Method ParametersJava Method OverloadingJava ScopeJava Recursion

Java Classes

Java OOPJava Classes/ObjectsJava Class AttributesJava Class MethodsJava ConstructorsJava this KeywordJava ModifiersJava EncapsulationJava Packages / APIJava InheritanceJava PolymorphismJava super KeywordJava Inner ClassesJava AbstractionJava InterfaceJava AnonymousJava EnumJava User InputJava Date

Java Errors

Java ErrorsJava DebuggingJava ExceptionsJava Multiple ExceptionsJava try-with-resources

Java File Handling

Java FilesJava Create FilesJava Write FilesJava Read FilesJava Delete Files

Java I/O Streams

Java I/O StreamsJava FileInputStreamJava FileOutputStreamJava BufferedReaderJava BufferedWriter

Java Data Structures

Java Data StructuresJava CollectionsJava ListJava ArrayListJava LinkedListJava List SortingJava SetJava HashSetJava TreeSetJava LinkedHashSetJava MapJava HashMapJava TreeMapJava LinkedHashMapJava IteratorJava Algorithms

Java Advanced

Java Wrapper ClassesJava GenericsJava AnnotationsJava RegExJava ThreadsJava LambdaJava Advanced Sorting

Java Projects

Java Projects

Java How To's

Java How Tos

Java Reference

Java ReferenceJava KeywordsJava String MethodsJava Math MethodsJava Output MethodsJava Arrays MethodsJava ArrayList MethodsJava LinkedList MethodsJava HashMap MethodsJava Scanner MethodsJava File MethodsJava FileInputStreamJava FileOutputStreamJava BufferedReaderJava BufferedWriterJava Iterator MethodsJava Collections MethodsJava System MethodsJava Errors & Exceptions

Java Examples

Java ExamplesJava CompilerJava ExercisesJava QuizJava ServerJava SyllabusJava Study PlanJava Interview Q&AJava Certificate


JavaNumbers and Strings

Adding Numbers and Strings

WARNING!

Java uses the+ operator for both addition and concatenation.

Numbers are added. Strings are concatenated.

If you add two numbers, the result will be a number:

Example

int x = 10;int y = 20;int z = x + y;  // z will be 30 (an integer/number)

Try it Yourself »

If you add two strings, the result will be a string concatenation:

Example

String x = "10";String y = "20";String z = x + y;  // z will be 1020 (a String)

Try it Yourself »

If you add a number and a string, the result will be a string concatenation:

Example

String x = "10";int y = 20;String z = x + y;  // z will be 1020 (a String)

Try it Yourself »


×

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

W3Schools is optimized for learning and training. Examples might be simplified to improve reading and learning.
Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness
of all content. While using W3Schools, you agree to have read and accepted ourterms of use,cookies andprivacy policy.

Copyright 1999-2025 by Refsnes Data. All Rights Reserved.W3Schools is Powered by W3.CSS.

[8]ページ先頭
©2009-2025 Movatter.jp