What does mean pipe equal operator

Question

I tried searching using Google Search and Stack nbsp Overflow  but it didn t show up any results  I have seen this in opensource library code   Notification notification   new Notification icon  tickerText  when   notification defaults    Notification DEFAULT SOUND  notification defaults    Notification DEFAULT VIBRATE    What does        pipe equal operator   mean

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I was looking for an answer on what    does in Groovy and although answers above are right on they did not help me understand a particular piece of code I was looking at   In particular  when applied to a boolean variable      will set it to TRUE the first time it encounters a truthy expression on the right side and will HOLD its TRUE value for all    subsequent calls  Like a latch   Here a simplified example of this   groovy gt  boolean result   groovy gt    ------------  groovy gt  println result              lt -- False by default groovy gt  println result    false  groovy gt  println result    true      lt -- set to True and latched on to it groovy gt  println result    false    Output   false false true true   Edit  Why is this useful   Consider a situation where you want to know if anything has changed on a variety of objects and if so notify some one of the changes  So  you would setup a hasChanges boolean and set it to     diff  a b  and then    dif b c  etc  Here is a brief example   groovy gt  boolean hasChanges  a  b  c  d  groovy gt  diff    x y - gt  x  y    groovy gt  hasChanges    diff a b   groovy gt  hasChanges    diff b c   groovy gt  hasChanges    diff true false   groovy gt  hasChanges    diff c d   groovy gt  hasChanges   Result  true

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You have already got sufficient answer for your question  But may be my answer help you more about    kind of binary operators       I am writing table for bitwise operators  Following are valid     ---------------------------------------------------------------------------------------- Operator   Description                                   Example ----------------------------------------------------------------------------------------           bitwise inclusive OR and assignment operator   C    2 is same as C   C   2           bitwise exclusive OR and assignment operator   C    2 is same as C   C   2  amp          Bitwise AND assignment operator                C  amp   2 is same as C   C  amp  2  lt  lt         Left shift AND assignment operator             C  lt  lt   2 is same as C   C  lt  lt  2  gt  gt         Right shift AND assignment operator            C  gt  gt   2 is same as C   C  gt  gt  2   ----------------------------------------------------------------------------------------   note all operators are binary operators       Also Note   for below points I wanted to add my answer       gt  gt  gt  is bitwise operator in Java that is called Unsigned shift but   gt  gt  gt   not an operator in Java       operator     is bitwise complement bits  0 to 1 and 1 to 0  Unary operator  but    not an operator    Additionally     Called Logical NOT Operator  but    Checks if the value of two operands are equal or not  if values are not equal then condition becomes true  e g   A    B  is true  where as A  B means if B is true then A become false  and if B is false then A become true       side note    is not called pipe  instead its called OR  pipe is shell terminology transfer one process out to next

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reads the same way as      notification defaults    Notification DEFAULT SOUND    is the same as  notification defaults   notification defaults   Notification DEFAULT SOUND    where   is the bit-wise OR operator   All operators are referenced here   A bit-wise operator is used because  as is frequent  those constants enable an int to carry flags   If you look at those constants  you ll see that they re in powers of two    public static final int DEFAULT SOUND   1  public static final int DEFAULT VIBRATE   2     is the same than 1 lt  lt 1 or 10 in binary public static final int DEFAULT LIGHTS   4     is the same than 1 lt  lt 2 or 100 in binary   So you can use bit-wise OR to add flags  int myFlags   DEFAULT SOUND   DEFAULT VIBRATE     same as 001   010  producing 011   so  myFlags    DEFAULT LIGHTS    simply means we add a flag   And symmetrically  we test a flag is set using  amp     boolean hasVibrate    DEFAULT VIBRATE  amp  myFlags     0

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is the bitwise-or operator  and it is being applied like

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Note      does not exist   logical or  You can use   y  y    expr     expr is NOT evaluated if y  true   or  y   expr   true   y      expr is always evaluated

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It s a shortening for this   notification defaults   notification defaults   Notification DEFAULT SOUND    And   is a bit-wise OR

[java] What does "|=" mean? (pipe equal operator)

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