Java number question

If result is initially equal to 5, what would its value be after the following statement has executed:
result *=3;

(a *= b) is a short way of writing (a = a*b). You multiply the left side by the right side, then assign the result to the left side.
http://java.sun.com/docs/books/tutorial/java/nutsandbolts/operators.html

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One more java random number question

which of the following codes are correct to generate a random number between start and end inclusively. Both methods seem to be working for me but im pretty sure one would be incorrect
int num = (int)(start + (Math.random() * (end-start)));
int num = (int)(start+1 + (Math.random() * (end-start)));

I say neither of them work. Let's use 5 and 8 as our start and end. In the Math class, random() is said to generate a random number, x, where 0 <= x < 1.
The first one:
First, multiply by 8 - 5 (3).
0 <= x < 3
Then, add 5.
5 <= x < 8
Then, casting to an int, we get a number 5 - 7.
The second one:
First, multiply by 8 - 5 (3).
0 <= x < 3
Then, add 6.
6 <= x < 9
Then, casting to an int, we get a number 6 - 8.
The "correct" way:
int num = (int) (Math.random() * (end - start + 1) + start);First, multiply by 8 - 5 + 1 (4).
0 <= x < 4
Then, add 5.
5 <= x < 9
Then, casting to an int, we get a number 5 - 8.

Simple Java Sound Question...

Can I draw waveforms while capturing data? If yes, how. If no, why.
Thanks. I need the answer ASAP, please help.

Hi nfactorial,
Can I draw waveforms while capturing data?If you would like to do that in Java you would need to know about how to use the Java language in general and especially about the Java Sound and Java2D APIs.
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Related readings:
Java Tutorial
http://java.sun.com/docs/books/tutorial/
Java Sound Documentation
http://java.sun.com/j2se/1.5.0/docs/guide/sound/index.html
Java Sound API Programmer's Guide
http://java.sun.com/j2se/1.5.0/docs/guide/sound/programmer_guide/contents.html
Java Sound Resources
http.//www.jsresources.org
Java 2D Graphics Tutorial
http://java.sun.com/docs/books/tutorial/2d/index.html
Wikipedia on fast fourier transformation
http://en.wikipedia.org/wiki/Fast_fourier_transform
HTH
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Hallo,
to the following pgm I had question:
static void printPrimes (int max) (= wavy bracket;
boolean(should be angular brackets) sieve = new booolean (angular br max+1
angular br)
int i,j;
for (i=2; i = max;i++)sieve(angluarbr i angular br)= true
i= 2
while (i= <= max;) (=wavy bracket Out.println (i+ " "); // is prime
for (j=i; j <= j+i) sieve(angular br j angularb.) = false;
while (i <= maxAmpersandAmpersand !sieve (angular br angular br)I++;
) wavy br ) wavy br.
I hope this is still kind of readable.
Q's are:
after the first "for" there is a new i=2, which seems to staty at 2 all the time; the following while does not change this value ( the beginning for i++ does not change this) and so seems to print 2 at all times (??)
then the inner loop seems to count up all the doubbles of the new prime number and thrwoes it out as false at the end of it;
the i values (increased with i++ seemsto refere at all times to the unit numbers and only indirect to the un it values, which are written/ assigned to it (??)
I seem to wonder how the pgm can print out anythings else the 2's.
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I hope this is still kind of readable.No, it's not. http://forum.java.sun.com/help.jspa?sec=formatting
Why are you omitting the braces and brackets? And why don't you type "program"? Aren't we worth the additional time it takes?
Q's are:
after the first "for" there is a new i=2, which
seems to staty at 2 all the time; the following
while does not change this value Why should it? You don't tell it to.
( the beginning for
i++ does not change this)It does. It just gets re-set to 2 after the for loop-
and so seems to print 2 at
all times (??)Yeah. What else?
then the inner loop seems to count up all the
doubbles of the new prime number and thrwoes it out
as false at the end of it; That part is definitely unreadable.

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Sorry, my English is not good...
my situation like this:
"List1" defined in a session bean, "shoppingCart.java", like this:
List<cell> List1 = new ArrayList();
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public class cell {
private String id;
private String type;
private Number quantity;
private String remarks;
public cell() {}
public cell(Number id) {
this.Id = id;
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public String copy_to_new(){
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during a recent job interview I was given a java assessment test and asked to write a code fragment to calculate factorials.
The tech lead then walked through the code with me and questioned how I would write the fragment
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He mentioned the phrase 'max value' somewhere, but I don't understand the solution he was looking for.
do any java gurus understand the question? can you provide a code fragment that meets this requirement?
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user13537476 wrote:
during a recent job interview I was given a java assessment test and asked to write a code fragment to calculate factorials.
The tech lead then walked through the code with me and questioned how I would write the fragment
'unbounded' by an int, long or double type.
He mentioned the phrase 'max value' somewhere, but I don't understand the solution he was looking for.He was probably asking what you would do if the result were bigger than Integer.MAX_VALUE, Long.MAX_VALUE, etc. Factorial grows very fast, so even a modest input can have a result that's too large to fit in those types.
do any java gurus understand the question? can you provide a code fragment that meets this requirement?I can't speak to what the interviewer was looking for, but if it were me, I'd use BigInteger.
I've seen the typical code samples using an int type as the input number.That would be sufficient to show the general approach, whether iterative or recursive, but it will only work for small values. If I recall, 12! is the largest factorial value that will fit into an int. You can use the same approach with BigInteger.

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muiajc wrote:
I know this is a simple question, but I can't search for the answer to this because it involves syntax that Google and the like don't seem to search for..
I am trying to figure out some Java code that I have found. I would like to know what:
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muiajc wrote:
I know this is a simple question, but I can't search for the answer to this because it involves syntax that Google and the like don't seem to search for..
I am trying to figure out some Java code that I have found. I would like to know what:
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Sorry for such a newbie question and such a long post, I did remember how to do this before but now I can't for the life of me remember. Anyhow, I have a simple question about importing custom-made java classes, from another directory in the windows operating system. I have the classpath set, and also I realize that because the two files below are in the same directory theres no need for an import statement as Java will look for the class in the same directory.
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c:\school\csc365\narcus.java
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import java.io.*;
class narcus implements Comparable
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c:\school\csc365\test.java
//test.java
//import statement? maybe import "c:\\school\\csc365\\*"; ?
import java.io.*;
class test
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I've tried the following import statements.
import "c:\\school\csc365\\narcus.java";
import "narcus.java";
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Hi Folks,
I am new to this forum, heard that interesting discussions always happens on this forum so immediately registered,don't want to miss any oppurtunity to participate in discussions.
I have pretty much basic question regarding compiling and exceuting files in different packages.I have the following directory structure
C:\Projects\WDPROEast\Development\CommonService\Code\Java from where java files stored in different packages as follows:
com\wdpro\commerce\common\crm\dae\nautilus\adapter directory has java files in com.wdpro.commerce.coomon.crm.dae.nautilus.adapter package.
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com\wdpro\commerce\common\dls\exception has java files with corresponding package name.
com\wdpro\commerce\common\dto has java files under proper package name.
com\wdpro\commerce\common\exception has java files with appropriate package name.
com\wdpro\commerce\common\util has java files with package name. I am starting at Java Directory,want to compile and run file named a.java in com.wdpro.commerce.coomon.crm.dae.nautilus.adapter package with having all other java files on classpath as follows
so I issued command for compilation as follows C:\Projects\WDPROEast\Development\CommonService\Code\Java>javac com/wdpro/commerce/common/crm/dae/nautilus/ada
pter/a.java com/wdpro/commerce/common/crm/dae/nautilus/adapter/NautilusServiceUtility.java com/wdp
ro/commerce/common/crm/dae/nautilus/adapter/URLReader.java com/wdpro/commerce/common/crm/dae/nautilus/adapter/
b.java com/wdpro/commerce/common/dae/exception/*.java com/wdpro/commerce/common/dto/*.java
com/wdpro/commerce/common/exception/*.java com/wdpro/commerce/common/util/*.java com/wdpro/commerce/common/dl
s/exception/*.java It compiled greatly but when I issue command to run a.class file as
C:\Projects\WDPROEast\Development\CommonService\Code\Java>java com/wdpro/commerce/common/crm/dae/nautilus/adap
ter/UtilityAccesssit's giving following exception
Exception in thread "main" java.lang.NoClassDefFoundError: com/wdpro/commerce/common/crm/dae/nautilus/adapter/
UtilityAccesssbut when I run a.java with the following command
C:\Projects\WDPROEast\Development\CommonService\Code\Java>java com/wdpro/commerce/common/crm/dae/nautilus/adap
ter/UtilityAccess com/wdpro/commerce/common/crm/dae/nautilus/adapter/NautilusServiceUtility.java com/wdpro/com
merce/common/crm/dae/nautilus/adapter/URLReader.java com/wdpro/commerce/common/crm/dae/nautilus/adapter/Nautil
usAccessUtility.java com/wdpro/commerce/common/dae/exception/*.java com/wdpro/commerce/common/dto/*.java com/w
dpro/commerce/common/exception/*.java com/wdpro/commerce/common/util/*.java com/wdpro/commerce/common/dls/exce
ption/*.javaSo my question do I need to add all required java files to path when required class files are under different packages?is it manadatory.
I hope you understand my question,pass me any comments you may have.
Thanks alot,
Anu

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