I need to query single bytes - Pls help

Question

Hi, I have got a method which performs different operations. I would like to update the state of a variable with the different steps occurred in the code execution and, at a later time, to query this variable to check what to do.
Example:
variable = -1;//This is an instance variable
if (cacheCleared) {
  variable &= PageCanvas.CACHE_CLEARED;
if (imagesCleared) {
  variable &= PageCanvas.IMAGES_CLEARED;
if (xmlCleared) {
  variable &= PageCanvas.XML_CLEARED;
//And so on...Then, after the method returns, I'd like to be able to to query 'variable' to check which steps have been performed with something like:
if ((variable == PageCanvas.CACHE_CLEARED & PageCanvas.IMAGES_CLEARED)) {
   //do something;
} else if (variable == PageCanvas.CACHE_CLEARED & PageCanvas.XML_CLEARED) {
  //do something else
}I saw somewhere something like offset concepts, but I don't know how to implement it. Could you keep in mind that we run in a memory constrained environment, therefore I'd like to use, let's say, an int and having the constants as bytes?
Thanks for any help.

Answer 1

Hi, I have tried the following code:
byte b1 = 1;
byte b2 = 2;
byte b3 = 4;
byte b4 = 8;
byte results = 0;
results |= b1;
results |= b3;
results |= b4;
System.out.println(results == (results | b1));
System.out.println(results == (results | b2));
System.out.println(results == (results | b3));
System.out.println(results == (results | b4));And the result is:
true
false
true
true
However, I noticed that it's important to assign the bytes the values of the bits right to left:
0000 0001
0000 0010
0000 0100
0000 1000
The first byte should have value 1
The second should have value 2
The third should have value 4
The fourth should have value 8
So that the | operator works.