Your browser does not seem to support CSS. If images appear below, please disregard them.
It appears that you're running an Ad-Blocker. This site is monetized by Advertising and by ">User Donations; we ask that if you find this site helpful that you whitelist us in your Ad-Blocker, or make a ">Donation to help aid in operating costs.
Previous Thread
Next Thread
Print Thread
Rate This Thread
#19066 - 01/03/04 08:22 AM Java question, Pergesu where are you!!!  
Joined: Dec 2002
Posts: 3,255
§intå× Offline
§intå×  Offline

Joined: Dec 2002
Posts: 3,255
Likes: 3
I am studying java, actually I am taking a CBT course through work. I am studying shift opperators and do not understand quite how I would use this in code. Now this sounds most handy for something like encryption, but how to I get access to the acctual stream of 1's and 0's in the data stream?

<< and >> and >>>

Please give an example of when I would use this.

Sponsored Links
#19067 - 01/03/04 08:23 AM Re: Java question, Pergesu where are you!!!  
Joined: Dec 2002
Posts: 3,255
§intå× Offline
§intå×  Offline

Joined: Dec 2002
Posts: 3,255
Likes: 3
Also The course is saying the << is use for when doing multiplication by 2 and >> is useful when doing division by 2. why not just int*2 and int/2

#19068 - 01/03/04 10:25 PM Re: Java question, Pergesu where are you!!!  
Joined: Jan 2004
Posts: 6
vooduhal Offline
Junior Member
vooduhal  Offline
Junior Member

Joined: Jan 2004
Posts: 6
Let me give you an example of how this could be useful. I wrote this a while back for a goofy little programming language. The language is c but it still applies.
#define CHAR_LENGTH 8

// char *CharToBinary(char a_chChar)
// Accepts:  A single character
// Returns:  The binary string equivalent of the the input character
// Purpose:  Converts the given char to its binary string format
char *char2binary(char a_chChar) {
	char 	 *p_chBuffer = (char *)malloc(CHAR_LENGTH); 	// This will hold our converted buffer
	int	 intCtr=0; 		// You can figure this one out
	// Now let's just loop through each bit
	for(intCtr=0; intCtr<CHAR_LENGTH; intCtr++) 
		// We are just going to use a binary & to determine the value of each bit
		p_chBuffer[7 - intCtr] = (((a_chChar & (1 << intCtr)) == ( 1 << intCtr)) ? 0x31 : 0x30);
	// Ok we're done
	return p_chBuffer;
Hope that helps. Basically, realizes that each bit can be seperated by using powers of 2, ie. 00000010 = 2, 00000100 = 4 etc. I use that fact to create a quick little loop to break the byte down. Let me know if you need any explanation.

#19069 - 01/04/04 02:38 PM Re: Java question, Pergesu where are you!!!  
Joined: Mar 2002
Posts: 1,136
pergesu Offline
UGN Elite Poster
pergesu  Offline
UGN Elite Poster

Joined: Mar 2002
Posts: 1,136
Pimpin the Colorizzle
Alright, here's a quick example.

public class test {
        public static void main(String args[]) {
                int i = 5 << 4;
The << operator in this case is used to multiply 5 by 2^4, which is 16. Thus the output is 80.

5 * [2^4]

Likewise, the >> operator would be used to multiply the left value by 2^rvalue.

You very rarely use either of these. They're useful if you need to multiply or divide by a power of 2. Otherwise, you don't use them.

To be honest, I've never used the >>> operator, and don't know what it does off the top of my head.

Using bitshift operators on data streams is pointless, as well as bad practice. You should use the methods provided by the stream classes to access data.

In five years of doing Java coding, I don't believe I've ever used any of these operators. So I really don't know too much about them, except that basic example I gave above. Just goes to show how useful they really are *wink* since for some reason I can't use a parentheses

Member Spotlight
Portland, OR; USA
Posts: 7,198
Joined: February 2002
Show All Member Profiles 
Forum Statistics
Average Daily Posts2
Most Online1,567
Apr 25th, 2010
Latest Postings
by Gremelin on 01/14/17 07:03 PM
Top Posters(All Time)
UGN Security 40,989
Gremelin 7,198
§intå× 3,255
SilentRage 1,273
Ice 1,146
pergesu 1,136
Infinite 1,041
jonconley 955
Girlie 908
unreal 860
Top Liked Users (All Time)
§intå× Likes: 3
Black Beard Likes: 1
Cold Sunn Likes: 1
Crime Likes: 1
Cyrez Likes: 1
fleshwound Likes: 1
Ghost Likes: 2
Gremelin Likes: 12
Ice Likes: 1
ninjaneo Likes: 1
Top Liked Users (30 Days)
No Data Found
Powered by UBB.threads™ PHP Forum Software 7.6.0
(Snapshot build 20170206)