What does this operatoer |= mean?

Question

in the following code in java :

Notification noti = nBuilder.build();
NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
noti.flags |= Notification.FLAG_AUTO_CANCEL;

what is the this operator (|=) for ?

Answer 1

noti.flags |= Notification.FLAG_AUTO_CANCEL;

means

noti.flags = noti.flags | Notification.FLAG_AUTO_CANCEL;

where | is the Bit wise OR operator

Answer 2

• | is the bit a bit or operator

• |= is noti.flags = noti.flags | Notification.FLAG_AUTO_CANCEL;

  noti.flags |= Notification.FLAG_AUTO_CANCEL;

  calculates the bitwise OR of the noti.flags and Notification.FLAG_AUTO_CANCEL, and assigns the result to noti.flagsd.

Answer 3

bitwise or, is the same as:

noti.flags = noti.flags | Notification.FLAG_AUTO_CANCEL;

it executes an "or" operation with the bits of the operands. Say that you have

// noti.flags =                      0001011    (11 decimal)
// Notification.FLAG_AUTO_CANCEL =   1000001    (65 decimal)

// The result would be:              1001011    (75 decimal)

Answer 4

It's the bitwise OR with the assignment operator included. Expanded it would be noti.flags = noti.flags | Notification.FLAG_AUTO_CANCEL; Similarly you have &= for bitwise AND, ^= for bitwise XOR and ~= for bitwise NOT.