Creating a logical exclusive or operator in Java

Question

Observations   Java has a logical AND operator  Java has a logical OR operator  Java has a logical NOT operator    Problem   Java has no logical XOR operator  according to sun   I would like to define one    Method Definition   As a method it is simply defined as follows   public static boolean logicalXOR boolean x  boolean y        return     x    y    amp  amp      x  amp  amp  y            Method Call   This method is called in the following way   boolean myVal   logicalXOR x  y       Operator Usage   I would much rather have an operator  used as follows   boolean myVal   x    y      Question   I can t find anything on how to go about defining a new operator in Java   Where should I start

User · Answer

A and B would have to be boolean values to make    the same as xor so that the truth table would look the same  You could also use   A  B  lol

User · Answer

I am using the very popular class  org apache commons lang BooleanUtils   This method is tested by many users and safe  Have fun  Usage   boolean result  BooleanUtils xor new boolean   true false

User · Answer

Because boolean data type is stored like an integer  bit operator   functions like a XOR operation if used with boolean values       Mfpl - XOR Test java      public class XOR Test           public static void main  String args                  boolean a b               a false  b false              System out println  a false  b false   - gt        a b                 a false  b true              System out println  a false  b true   - gt        a b                 a true   b false              System out println  a true   b false   - gt        a b                 a true  b true              System out println  a true  b true   - gt        a b                     output of this program                      a false  b false   - gt   false                     a false  b true   - gt   true                     a true   b false   - gt   true                     a true  b true   - gt   false

User · Answer

This is an example of using XOR     from this answer byte   array 1   new byte     1  0  1  0  1  1    byte   array 2   new byte     1  0  0  1  0  1     byte   array 3   new byte 6    int i   0  for  byte b   array 1      array 3 i    b   array 2 i      Output 0 0 1 1 1 0

User · Answer

you ll need to switch to Scala to implement your own operators  pipe example

User · Answer

Here s an example   Given 2 int values  return true if one is negative and one is positive  Except if the parameter  negative  is true  then return true only if both are negative        public boolean posNeg int a  int b  boolean negative          if  negative           return  a gt 0  amp  amp  b lt 0   b gt 0  amp  amp  a lt 0                 else return  a lt 0  amp  amp  b lt 0

User · Answer

You can use Xtend  Infix Operators and Operator Overloading  to overload operators and  stay  on Java

User · Answer

You can just write  a  b    This would work the same as way as a   b

User · Answer

Java has a logical AND operator    Java has a logical OR operator    Wrong   Java has   two logical AND operators  normal AND is  amp  and short-circuit AND is  amp  amp   and two logical OR operators  normal OR is   and short-circuit OR is       XOR exists only as    because short-circuit evaluation is not possible

User · Answer

Logical exclusive-or in Java is called      You can also use   if you want to confuse your friends

User · Answer

Perhaps you misunderstood the difference between  amp  and  amp  amp     and    The purpose of the shortcut operators  amp  amp  and    is that the value of the first operand can determine the result and so the second operand doesn t need to be evaluated   This is especially useful if the second operand would results in an error  e g   if  set    null    set isEmpty       or if  list    null  amp  amp  list size    gt  0    However with XOR  you always have to evaluate the second operand to get the result so the only meaningful operation is

User · Answer

Here is a var arg XOR method for java     public static boolean XOR boolean    args      boolean r   false    for  boolean b   args        r   r   b        return r      Enjoy

User · Answer

The following your code   public static boolean logicalXOR boolean x  boolean y        return     x    y    amp  amp      x  amp  amp  y          is superfluous   Why not to write   public static boolean logicalXOR boolean x  boolean y        return x    y         Also  as javashlook said  there already is   operator      and   work identically  for boolean operands  your case   but differently for integer operands     Notes  1  They work identically for boolean  primitive type   but not Boolean  object type  operands  As Boolean  object type  values can have value null  And    will return false or true when one or both of its operands are null  while   will throw NullPointerException in this case  2  Although they work identically  they have different precedence  e g  when used with  amp   a  amp  b    c  amp  d will be treated as a  amp   b    c   amp  d  while a  amp  b   c  amp  d will be treated as  a  amp  b     c  amp  d   offtopic  ouch  C-style precedence table sucks

User · Answer

The only operator overloading in Java is   on Strings  JLS 15 18 1 String Concatenation Operator        The community has been divided in 3 for years  1 3 doesn t want it  1 3 want it  and 1 3 doesn t care   You can use unicode to create method names that are symbols    so if you have a symbol you want to use you could do myVal   x   y   where   is the symbol and x is not a primitive    but that is going to be dodgy in some editors and is limiting since you cannot do it on a primitive

User · Answer

That s because operator overloading is something they specifically left out of the language deliberately   They  cheated  a bit with string concatenation  but beyond that  such functionality doesn t exist    disclaimer  I haven t worked with the last 2 major releases of java  so if it s in now  I ll be very surprised

User · Answer

Java does have a logical XOR operator  it is    as in a   b    Apart from that  you can t define new operators in Java    Edit  Here s an example   public static void main String   args        boolean   all     false  true        for  boolean a   all            for  boolean b  all                boolean c   a   b              System out println a           b           c                       Output    false   false   false false   true   true true   false   true true   true   false

User · Answer

What you re asking for wouldn t make much sense  Unless I m incorrect you re suggesting that you want to use XOR to perform Logical operations the same way AND and OR do  Your provided code actually shows what I m reffering to   public static boolean logicalXOR boolean x  boolean y        return     x    y    amp  amp      x  amp  amp  y          Your function has boolean inputs  and when bitwise XOR is used on booleans the result is the same as the code you ve provided  In other words  bitwise XOR is already efficient when comparing individual bits booleans  or comparing the individual bits in larger values  To put this into context  in terms of binary values any non-zero value is TRUE and only ZERO is false   So for XOR to be applied the same way Logical AND is applied  you would either only use binary values with just one bit giving the same result and efficiency  or the binary value would have to be evaluated as a whole instead of per bit  In other words the expression   010    110     FALSE instead of   010    110     100  This would remove most of the semantic meaning from the operation  and represents a logical test you shouldn t be using anyway

User · Answer

Isn t it x    y

[java] Creating a "logical exclusive or" operator in Java

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