Split java integer and get values
Вопрос
I have next problem, I have integer in java and bites from 0 to 29 is timestamp, the bits from 30 to 31 means level (possible values 0, 1, 2, 3). So my question is, how do I get the timestamp as long value from this integer and how do I get the level as byte from this integer.
Решение 3
Here is the right answer:
void extract(int input) {
int level = input >>> 30;
int timestamp = (input & ~0xC0000000);
}
Thanks to previous guys to they answers.
Другие советы
int value = ...;
int level = value & 0x3;
long timestamp = (long) ( (value & ~0x3) >>> 2 );
Assuming the timestamp is unsigned:
void extract(int input) {
int timestamp = input >>> 2; // This takes the entire list of bits and moves drops the right 2.
int level = input & 0x03; // this takes the entire list of bits and masks off the right 2.
}
See http://download.oracle.com/javase/tutorial/java/nutsandbolts/op3.html
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