December 2009
Intermediate to advanced
1170 pages
28h 4m
English
Content preview from Big Java, 4th Edition
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
Appendix J. Bit and Shift Operations
There are four bit operations in Java: the unary negation (~) and the binary and (&), or (|), and exclusive or (^), often called xor.
Tables 1 and 2 show the truth tables for the bit operations in Java. When a bit operation is applied to integer values, the operation is carried out on corresponding bits.
Table J.1. The Unary Negation Operation
|
|
0 | 1 |
1 | 0 |
Table J.2. The Binary And, Or, and Xor Operations
|
|
|
|
|
0 | 0 | 0 | 0 | 0 |
0 | 1 | 0 | 1 | 1 |
1 | 0 | 0 | 1 | 1 |
1 | 1 | 1 | 1 | 0 |
For example, suppose we want to compute 46 & 13. First convert both values to binary. 46decimal = 101110binary (actually 00000000000000000000000000101110 as a 32-bit integer), and 13decimal = 1101binary. Now combine corresponding bits:
The answer is 1100binary = 12decimal.
You sometimes see the | operator being used to combine two bit patterns. For example, Font.BOLD is the value 1, Font.ITALIC is 2. The binary or combination Font.BOLD | Font.ITALIC has both the bold and the italic bit set:
Don't confuse the & and | bit operators with the && and || operators. The latter work only on boolean values, not on bits of numbers.
Besides the operations that work on individual bits, there are three shift operations that take the bit pattern of a number and shift it to the left or right by a given number of positions. There are three ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.