Operator overloading in Java

Question

Please can you tell me if it is possible to overload operators in Java  If it is used anywhere in Java could you please tell me about it

User · Accepted Answer

No  Java doesn t support user-defined operator overloading  The only aspect of Java which comes close to  custom  operator overloading is the handling of   for strings  which either results in compile-time concatenation of constants or execution-time concatenation using StringBuilder StringBuffer  You can t define your own operators which act in the same way though   For a Java-like  and JVM-based  language which does support operator overloading  you could look at Kotlin or Groovy  Alternatively  you might find luck with a Java compiler plugin solution

User · Answer

Operator overloading is used in Java for the concatenation of the String type   String concat    one     two     However  you cannot define your own operator overloads

User · Answer

In addition to all the people pointing out that   is overloaded for Strings  - is also overloaded for both floating point and integer operations  as are   and       edit    is also overloaded for floating point  which can be a bit of a surprise for those with a C or C   background

User · Answer

You can t do this yourself since Java doesn t permit operator overloading    With one exception  however    and    are overloaded for String objects

User · Answer

Just use Xtend along with your Java code  It supports Operator Overloading       package com example    SuppressWarnings  all   public class Test     protected int wrapped     public Test final int value        this wrapped   value         public int operator plus final Test e2        return  this wrapped   e2 wrapped          package com example  class Test2        new             val t1   new Test 3          val t2   new Test 5          val t3   t1   t2            On the official website  there is a list of the methods to implement for each operator

User · Answer

Or  you can make Java Groovy and just overload these functions to achieve what you want    plus     gt  for the   operator   multiply     gt  for the   operator   leftShift     for the  lt  lt  operator        and so on      class Fish       def leftShift Fish fish            print  You just  lt  lt   left shifted  some fish             def fish   new Fish   def fish2   new Fish    fish  lt  lt  fish2   Who doesnt want to be use groovy   D  No you cannot use the compiled groovy JARs in Java the same way  It still is a compiler error for Java

User · Answer

One can try Java Operator Overloading  It has its own limitations  but it worth trying if you really want to use operator overloading

User · Answer

Java does not allow operator overloading  The preferred approach is to define a method on your class to perform the action  a add b  instead of a   b  You can see a summary of the other bits Java left out from C like languages here  Features Removed from C and C

User · Answer

Unlike C    Java does not support user defined operator overloading  The overloading is done internally in java   We can take   plus  for example   int a   2   4  string    hello     world     Here  plus adds two integer numbers and concatenates two strings  So we can say that Java supports internal operator overloading but not user defined

User · Answer

As many others have answered  Java doesn t support user-defined operator overloading  Maybe this is off-topic  but I want to comment on some things I read in some answers  About readability  Compare   c   a   b c   a add b   Look again  Which one is more readable  A programming language that allows the creation of user-defined types  should allow them to act in the same way as the built-in types  or primitive types   So Java breaks a fundamental principle of Generic Programming  We should be able to interchange objects of built-in types with objects of user-defined types   You may be wondering   quot Did he say  objects of built-in   quot   Yes  see here   About String concatenation  Mathematicians use the symbol   for commutative operations on sets  So we can be sure that a   b   b   a  String concatenation  in most programming languages  doesn t respect this common mathematical notation   a     quot hello quot   b     quot world quot   c     a   b   b   a     or in Java   String a    quot hello quot   String b    quot world quot   boolean c    a   b  equals b   a     Extra  Notice how in Java equality and identity are confused  The     equality  symbol means  a  Equality for primitive types  b  Identity-check for user-defined types  therefore  we are forced to use the function equals   for equality  But    What has this to do with operator overloading  If the language allows the operator overloading the user could give the proper meaning to the equality operator

[java] Operator overloading in Java

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