Is a DB cloass acees should be public static or not.
Hiiiiiiiii,
I have a java class which query database or insert or update database.Class have separate method for each functionality and during this design I have something to know. IS the method will be public static or not. If I made the methods public static and after that want to make it a t*hread safe with synchronized* then there will be c*lass level lock,*so it will prevent to access other method. But in opinion of my senior it must be public static.
Please providing me a solution with proper reason which will give me a ground to get into field.
ejp wrote:
Because a class that only has static methods is generally an indication of bad design, especially if it also has static data members. Usually such a class should be converted to the Singleton pattern.Which is bad design, formalized.
Similar Messages
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How to call java with public static void main(String[] args) throws by jsp?
how do i call this from jsp? <%spServicelnd temp = new spServicelnd();%> does not work because the program has a main. can i make another 2nd.java to call this spServiceInd.java then call 2nd.java by jsp? if yes, how??? The code is found below...
import java.net.MalformedURLException;
import java.io.IOException;
import com.openwave.wappush.*;
public class spServiceInd
private final static String ppgAddress = "http://devgate2.openwave.com:9002/pap";
private final static String[] clientAddress = {"1089478279-49372_devgate2.openwave.com/[email protected]"};
// private final static String[] clientAddress = {"+639209063665/[email protected]"};
private final static String SvcIndURI = "http://devgate2.openwave.com/cgi-bin/mailbox.cgi";
private static void printResults(PushResponse pushResponse) throws WapPushException, MalformedURLException, IOException
System.out.println("hello cze, I'm inside printResult");
//Read the response to find out if the Push Submission succeded.
//1001 = "Accepted for processing"
if (pushResponse.getResultCode() == 1001)
try
String pushID = pushResponse.getPushID();
SimplePush sp = new SimplePush(new java.net.URL(ppgAddress), "SampleApp", "/sampleapp");
StatusQueryResponse queryResponse = sp.queryStatus(pushID, null);
StatusQueryResult queryResult = queryResponse.getResult(0);
System.out.println("Message status: " + queryResult.getMessageState());
catch (WapPushException exception)
System.out.println("*** ERROR - WapPushException (" + exception.getMessage() + ")");
catch (MalformedURLException exception)
System.out.println("*** ERROR - MalformedURLException (" + exception.getMessage() + ")");
catch (IOException exception)
System.out.println("*** ERROR - IOException (" + exception.getMessage() + ")");
else
System.out.println("Message failed");
System.out.println(pushResponse.getResultCode());
}//printResults
public void SubmitMsg() throws WapPushException, IOException
System.out.println("hello cze, I'm inside SubmitMsg");
try
System.out.println("hello cze, I'm inside SubmitMsg (inside Try)");
//Instantiate a SimplePush object passing in the PPG URL,
//product name, and PushID suffix, which ensures that the
//PushID is unique.
SimplePush sp = new SimplePush(new java.net.URL(ppgAddress), "SampleApp", "/sampleapp");
//Send the Service Indication.
PushResponse response = sp.pushServiceIndication(clientAddress, "You have a pending Report/Request. Please logIn to IRMS", SvcIndURI, ServiceIndicationAction.signalHigh);
//Print the response from the PPG.
printResults(response);
}//try
catch (WapPushException exception)
System.out.println("*** ERROR - WapPushException (" + exception.getMessage() + ")");
catch (IOException exception)
System.out.println("*** ERROR - IOException (" + exception.getMessage() + ")");
}//SubmitMsg()
public static void main(String[] args) throws WapPushException, IOException
System.out.println("hello cze, I'm inside main");
spServiceInd spsi = new spServiceInd();
spsi.SubmitMsg();
}//main
}//class spServiceIndIn general, classes with main method should be called from command prompt (that's the reason for main method). Remove the main method, put the class in a package and import the apckage in your jsp (java classes should not be in the location as jsps).
When you import the package in jsp, then you can instantiate the class and use any of it's methods or call the statis methods directly:
<%
spServiceInd spsi = new spServiceInd();
spsi.SubmitMsg();
%> -
We just have switched our local server from 32-bit to 64-bit machine and now we have Windows Server 2008 R2 Service
Pack 1 with MS Office 2007. On server we are running an application in ASP.Net 3.5 using visual studio
2008. All users have 32-bit windows 7 and MS Office 2007.
when user tries to import data from Excel to Database (SQL Server 2005), error comes as
"microsoft.ace.oledb.12.0 provider is not registered on local machine".
I have tried a solution by installing Access Database Engine 2007 Office System Driver on the Server, but the error
was same. Now what should I do to resolve this problem??? Should we install Office 2010 64-bit on the Server or is there any other solution???Hi,
Thanks for your posting.
the file can be made in excel 2007, try to install:2007 Office System Driver: Data Connectivity Components
http://www.microsoft.com/en-us/download/details.aspx?id=23734
Regards.
Vivian Wang
TechNet Community Support -
How can i pass the values to method public static void showBoard(boolean[][
I need x and y to pass to the method
public static void showBoard(boolean[][] board
i am very confused as to why its boolean,i know its an array but does that mean values ar true or false only?Thanks
import java.util.Random;
import java.util.Scanner;
public class Life1
public static void main(String[] args)
int x=0;
int y=0;
Scanner keyIn = new Scanner(System.in);
System.out.println("Enter the first dimension of the board : ");
x = keyIn.nextInt();
System.out.println("Enter the second dimension of the board : );
y = keyIn.nextInt();
boolean[][] board = new boolean[x][y];
fillBoard(board);
showBoard(board);
//Ask the user how many generations to show.
board = newBoard(board);
showBoard(board);
//This method randomly populates rows 5-9 of the board
//Rewrite this method to allow the user to populate the board by entering the
//coordinates of the live cells. If the user requests that cell 1, 1 be alive,
//your program should make cell 0,0 alive.
public static void fillBoard(boolean[][] board)
int row, col, isAlive;
Random picker = new Random();
for(row = 4; row < 9; row++)
for(col = 4; col < 9; col++)
if (picker.nextInt(2) == 0)
board[row][col] = false;
else
board[row][col] = true;
//This method displays the board
public static void showBoard(boolean[][] board)
int row, col;
System.out.println();
for(row=0; row < x; row++)
for(col=0; col<y; col++)
if (board[row][col])
System.out.print("X");
else
System.out.print(".");
System.out.println();
System.out.println();
//This method creates the next generation and returns the new population
public static boolean[][] newBoard(boolean[][] board)
int row;
int col;
int neighbors;
boolean[][] newBoard = new boolean[board.length][board[0].length];
makeDead(newBoard);
for(row = 1; row < board.length-1; row++)
for(col = 1; col < board[row].length-1; col++)
neighbors = countNeighbors(row, col, board);
//make this work with one less if
if (neighbors < 2)
newBoard[row][col]=false;
else if (neighbors > 3)
newBoard[row][col] = false;
else if (neighbors == 2)
newBoard[row][col]= board[row][col];
else
newBoard[row][col] = true;
return newBoard;
//This method counts the number of neighbors surrounding a cell.
//It is given the current cell coordinates and the board
public static int countNeighbors(int thisRow, int thisCol, boolean[][] board)
int count = 0;
int row, col;
for (row = thisRow - 1; row < thisRow + 2; row++)
for(col = thisCol - 1; col < thisCol + 2; col++)
if (board[row][col])
count++;
if (board[thisRow][thisCol])
count--;
return count;
//This method makes each cell in a board "dead."
public static void makeDead(boolean[][] board)
int row, col;
for(row = 0; row < board.length; row++)
for(col = 0; col < board[row].length; col++)
board[row][col] = false;
}this is what im workin with mabey you can point me in the right directionimport java.util.Random;
/* This class creates an application to simulate John Conway's Life game.
* Output is sent to the System.out object.
* The rules for the Life game are as follows...
* Your final version of the program should explain the game and its use
* to the user.
public class Life
public static void main(String[] args)
//Allow the user to specify the board size
boolean[][] board = new boolean[10][10];
fillBoard(board);
showBoard(board);
//Ask the user how many generations to show.
board = newBoard(board);
showBoard(board);
//This method randomly populates rows 5-9 of the board
//Rewrite this method to allow the user to populate the board by entering the
//coordinates of the live cells. If the user requests that cell 1, 1 be alive,
//your program should make cell 0,0 alive.
public static void fillBoard(boolean[][] board)
int row, col, isAlive;
Random picker = new Random();
for(row = 4; row < 9; row++)
for(col = 4; col < 9; col++)
if (picker.nextInt(2) == 0)
board[row][col] = false;
else
board[row][col] = true;
//This method displays the board
public static void showBoard(boolean[][] board)
int row, col;
System.out.println();
for(row=0; row < 10; row++)
for(col=0; col<10; col++)
if (board[row][col])
System.out.print("X");
else
System.out.print(".");
System.out.println();
System.out.println();
//This method creates the next generation and returns the new population
public static boolean[][] newBoard(boolean[][] board)
int row;
int col;
int neighbors;
boolean[][] newBoard = new boolean[board.length][board[0].length];
makeDead(newBoard);
for(row = 1; row < board.length-1; row++)
for(col = 1; col < board[row].length-1; col++)
neighbors = countNeighbors(row, col, board);
//make this work with one less if
if (neighbors < 2)
newBoard[row][col]=false;
else if (neighbors > 3)
newBoard[row][col] = false;
else if (neighbors == 2)
newBoard[row][col]= board[row][col];
else
newBoard[row][col] = true;
return newBoard;
//This method counts the number of neighbors surrounding a cell.
//It is given the current cell coordinates and the board
public static int countNeighbors(int thisRow, int thisCol, boolean[][] board)
int count = 0;
int row, col;
for (row = thisRow - 1; row < thisRow + 2; row++)
for(col = thisCol - 1; col < thisCol + 2; col++)
if (board[row][col])
count++;
if (board[thisRow][thisCol])
count--;
return count;
//This method makes each cell in a board "dead."
public static void makeDead(boolean[][] board)
int row, col;
for(row = 0; row < board.length; row++)
for(col = 0; col < board[row].length; col++)
board[row][col] = false;
} -
Declaring public static final variables in jsp?
The question is in the title...
I know this is not a jsp forum, but some people here might know if it's possible or not.
If yes, how to declare them and how to access them from other jsp pages?
ThxIf you need that, you definitely do too much work in your JSPs. You should do all your work in Servlets (or Actions if you're using Struts or something similar).
Your JSPs should only do the presentation.
Remember that JSPs are not classes (they are compiled into classes internally, but you don't have direct access to those).
If you absolutely need such a public static final field that you want to access from several JSPs, just define it in a Class and reference that class from your JSPs. -
Hi
I have 3 classes, A, B & C.
I have one variable, var, that can be used in class B and C; I have declared it in class B, and passed when I create an istance of C in B.
Then I need also to read its value in class A.
Now the ways are two (I think ...):
1. declare it as public static in class A and then use A.var in class B and C;
2. declare it as private in A and then passed to B when I create in A an istance of B and to C then I create in B an istance to C.
Considerations:
a. I don't like to declare public variables, I think is a bad way to program,
isn'it?
b. the second way is a problem when I have 10 variables (the constructors have too many parameters), right?
Could anyone help?The problem is I tryied to find these answer in
Intenrnet, but I don't find anything.That's fine. That's why most of us are here.
My application works as this:
I have a main class (A) that have a main menu in
console style; from this class I create a new client
class (B) that receive commands from a server; if a
command is valid, B create an istance of C that
rappresents a trainer machine. In C I have all
workout variables (time, incline, speed ...).
By menu (in class A) i could pause the trainer and by
A and/or remote server I could ask the state of the
machine (C).
In your explanation above, I draw your attention to "instance". You are making instances of your classes. That being the case, your variables should probably be instance variables
NOT
public static int firstVariable = 0;BUT
protected int firstVariable = 0;You would then provide get and set methods to access the protected variable.
If you find yourself writing B b = new B() then you know you are dealing with an instance and you should avoid all static variables unless you really do mean "this value is the same across all Bs".
I have 8 state variables I could manage in that way.
The only way I have for now found is definite a
public static long vars in C (and use them in A e B
as C.state, C.time, ...) to avoid to pass 8
parameters when I create the istances from A to C.Assuming that C has eight variables and your design isn't done yet you can still pass an instance of C to the other objects. They don't need to have their method/constructor signatures changed when you add a new variable as your C object encapsulates it already.
>
Is right? Any other suggestion?Yes. Don't stick to "C.time" because that's what you've got so far. Instead, you should be using
C c = new C();
c.getTime();That way, the time variable is unique to the instance. -
Trying to acces the value of a public static final int using reflection
-Java 6
-Windows XP
-Signed Applet
doing the following:
Class.forName(classname).getField(code).getInt(null);
is giving me the error:
java.lang.IllegalAccessException: Class com.cc.applet.util.ServiceConfiguration can not access a member of class com.cc.util.error.codes.SendMessageErrorCodes with modifiers "public static final"
at sun.reflect.Reflection.ensureMemberAccess(Unknown Source)
at java.lang.reflect.Field.doSecurityCheck(Unknown Source)
at java.lang.reflect.Field.getFieldAccessor(Unknown Source)
at java.lang.reflect.Field.getInt(Unknown Source)
I'm not understanding why it can't access the value of the field. Any help would be great.
Edited by: zparticle on Oct 17, 2007 11:07 PMstefan.schulz wrote:
oebert, you are right. Good one.
I actually think that, in this case, the message is misleading. The current implementation of sun.reflect.Reflection.ensureMemberAccess() treats any failing access check the same. It should and could inculde better contextual information.Stefan,
That is a good point. Did you file a RFE with Sun yet? I also think they should provide a more contextual error message in this case.
Gili -
Public static final Comparator String CASE_INSENSITIVE_ORDER
in this declaration..
public static final Comparator<String> CASE_INSENSITIVE_ORDER
what does <String> mean?
thanks!what does the Comparator do. Look at the API and you would see the following description about the compare method.
public int compare(Object o1,
Object o2)Compares its two arguments for order. Returns a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second.
The implementor must ensure that sgn(compare(x, y)) == -sgn(compare(y, x)) for all x and y. (This implies that compare(x, y) must throw an exception if and only if compare(y, x) throws an exception.)
The implementor must also ensure that the relation is transitive: ((compare(x, y)>0) && (compare(y, z)>0)) implies compare(x, z)>0.
Finally, the implementer must ensure that compare(x, y)==0 implies that sgn(compare(x, z))==sgn(compare(y, z)) for all z.
It is generally the case, but not strictly required that (compare(x, y)==0) == (x.equals(y)). Generally speaking, any comparator that violates this condition should clearly indicate this fact. The recommended language is "Note: this comparator imposes orderings that are inconsistent with equals."
Now your question is about what <String> is in your declaration. It is the type of the objects which are going to be compared. -
Private construtor, public static method
Hi,
I'm having a problem trying to use a class' method. The class' constructor is private, and the methods are public static....
I created an object that belongs to the class, but then when I try to apply the methods to the object, the do not appear (qhen I write the period). Does anybody know why this happens...
Thanks and regardsOk,
I'll show you the code I'm trying to use. In case you want to see more from it, I downloaded it from http://info.synapse.ru/software/jpitsa/
Just to give you a more clear idea, I unzipped the jar file which contained the code, and I got two classes with the same name on the same folder (one is a read-only file). The class I'm trying to use is called "Methods". The particular method I'm trying to use from that class is the one called hilbert, which does the Hilbert Transform (which is a Mathematical transformartion for signal processing).
Thanks for your help. Here comes my code:
* Spectral Analysis Module
* @author Denis Mishin ([email protected])
package jpitsa.core;
import java.util.LinkedList;
public final class Methods implements Params {
private Methods() { }
* Discrete Fourier Transform. <BR>
* This method can be applied to data with any data points, not only a power of 2,
* but works significantly slower then DFFT algorithm
* @param source the data to transform
* @param direct true if transform is direct, false for inverse
* @param fullSpectrum as fourier transform is symmetrical, it is possible to use only one part of it.\
* then the spectrum is created for 1/2 N points. reverse transform will work pretty well.
* @see jpitsa.core.ComplexVector
public static ComplexVector DFT (ComplexVector source, boolean direct) {
ComplexVector result;
float[] resIm, resRe;
float[] srcIm, srcRe;
float isign = (direct == true) ? 1f : -1f;
srcIm = source.getDataImaginaryPart();
srcRe = source.getDataRealPart();
int N = srcIm.length;
float mf = (direct == true) ? 1f : 1f/(float)N;
resIm = new float[N];
resRe = new float[N];
double fac;
double f1, fCos, fSin;
f1 = isign*2*Math.PI/(float)N;
for (int n=0; n < N/2; n++) {
for (int k=0; k < (N-1); k++) {
fac = (float)(f1*(double)(k*n));
fCos = Math.cos(fac);
fSin = Math.sin(fac);
resRe[n] += srcRe[k]*fCos - srcIm[k]*fSin;
resIm[n] += srcRe[k]*fSin + srcIm[k]*fCos;
resRe[n] *= mf;
resIm[n] *= mf;
resRe[N-1-n] = resRe[n];
resIm[N-1-n] = resIm[n];
return new ComplexVector(resRe, resIm);
* This method computes Discrete Fast Fourier Transform from a given
* complex array. Return type is also a complex array.
* Objectives: only data of 2^n points can be processed. Thus providing number of aliasing effects.
* @see jpitsa.core.ComplexVector
public static ComplexVector DFFT (ComplexVector source, boolean direct) {
ComplexVector result;
float[] data;
int isign, ndat;
isign = (direct == true) ? 1 : -1;
data = source.getPackedData();
ndat = (data.length-1)/2;
four1 (data, ndat, isign);
//System.out.println("ndat="+ndat);
// too big values .... [mar-99]
if(!direct) {
for(int i=0; i < ndat*2-1; i++)
data[i] /= ndat;
result = new ComplexVector();
result.setPackedData(data);
return result;
* Computes a spectrum of TimeSeries
* @return spectrum truncated to Nyquist frequency
public static ComplexVector spectrum(TimeSeries source) {
float sampfreq = source.getSamplingFrequency();
ComplexVector spec = DFFT(new ComplexVector(source.getData(),null), true);
float[] srcReal, srcImag, tgtReal, tgtImag;
srcReal = spec.getDataRealPart();
srcImag = spec.getDataImaginaryPart();
tgtReal = new float[srcReal.length/2];
tgtImag = new float[srcImag.length/2];
System.arraycopy(srcReal, 0, tgtReal, 0, tgtReal.length);
System.arraycopy(srcImag, 0, tgtImag, 0, tgtImag.length);
return new ComplexVector(tgtReal, tgtImag);
* Return given spectrum part of time series object
* @param source source data
* @param part defines which part of transform to extract (AMPLITUDE, PHASE, REAL, IMAGINARY)
* @return spectrum (FrequencySeries) object
public static FrequencySeries spectrum(TimeSeries source, int part) {
ComplexVector spec = spectrum(source);
float sPart[] = extractPart(spec, part);
sPart[0] = sPart[1];
return new FrequencySeries(sPart,source.getSamplingFrequency()/((float)(2*sPart.length)));
public static FrequencySeries spectrum(TimeSeries source, int part, int smooth_win) {
ComplexVector spec = spectrum(source);
float sPart[] = extractPart(spec, part);
sPart[0] = sPart[1];
sPart = smooth(sPart, smooth_win);
return new FrequencySeries(sPart, source.getSamplingFrequency()/((float)(2*sPart.length)));
public static FrequencySeries power_spectrum(TimeSeries src)
float tr_wrk[]; /* pntr to work trace */
float tr_tap[]; /* pntr to taper */
float tr_ans[]; /* pntr to answer */
// float *tr_src[]; /* pntr to source trace */
float t_samp; /* sampling rate of trace */
float delta_f; /* delta f of resulting power spec */
float wss; /* window squared and summed */
float sumsq; /* sum of the input trace squared */
float avesq; /* ave of the input trace squared */
float pow_sum; /* PSD Sum */
int i1, i2; /* index of the zoom in spr_zoom */
int n1, n2, n3, n4; /* taper window size */
int i,j; /* loop vars */
int index; /* index into data from cha_list */
int n_dat; /* size of trace */
int done; /* tells us if we are done with io */
int io_res; /* result of an io operation */
int n_fft; /* number of points in fft window */
int n_chk; /* temp to check that n_fft is pwr of 2 */
int i_st; /* start of window for fft */
int ask_each; /* see if we ask for input each loop */
int io_taper; /* taper method we are going to use */
boolean zero_pad; /* true when we have to zero pad window */
int sc_type; /* type of scale ie lin-lin */
int selection_method; /* selection used for zoom */
int status; /* status of zoom */
int n; /* number of fft's used for answer */
get the size of the trace
float[] tr_src = src.getData();
n_dat = tr_src.length;
i1 = 0; i2 = tr_src.length-1;
n_fft = next2power(n_dat); // check!!!!
dt_copy_header(buffer[0],data[index]);
dt_copy_header(buffer[1],data[index]);
dt_copy_header(buffer[2],data[index]);
dt_head_access(buffer[0],RCD_NDAT,(void *)&n_fft);
dt_head_access(buffer[1],RCD_NDAT,(void *)&n_fft);
n = n_fft/2 + 1;
// dt_head_access(buffer[2],RCD_NDAT,(void *)&n);
tr_wrk = new float[n_fft+1];
System.arraycopy(tr_src, 0, tr_wrk, 0, tr_src.length);
tr_tap = new float[tr_wrk.length];
System.arraycopy(tr_wrk, 0, tr_tap, 0, tr_wrk.length);
//tr_wrk = dt_trace_access(buffer,0, 0);
//tr_tap = dt_trace_access(buffer,1 ,0);
//tr_tap = // taper_it
tr_ans = new float[n];
//tr_ans = dt_trace_access(buffer,2 ,0);
//tr_src = dt_trace_access(data ,index,0);
calculate the mean squared amplitude
sumsq = 0f;
for (j=i1; j<i2; j++) {
sumsq += tr_src[j] * tr_src[j];
avesq = sumsq / (float)(n_dat);
get the taper values. Buffer 0 gets tapered even thought there is nothing there
n1 = 0;
n2 = n3 = n_fft/2 - 1;
n4 = n_fft - 1;
Taper.doTapering(tr_tap, n1, n2, n3, n4, n_fft, WELCH_WINDOW);
init the result
for (j=0; j<n_fft/2; j++) {
tr_ans[j] = 0;
calculate wss (window squared and summed)
wss = 0f;
for (j=0; j<n_fft; j++) {
wss += tr_tap[j] * tr_tap[j];
wss *= (float)n_fft;
calculate fft's until we need to pad with zeros
t_samp = src.getSamplingInterval();
zero_pad = false;
i_st = i1;
n = 0;
while (!zero_pad) {
load work array and taper
for (j=0; j<n_fft; j++) {
if ((i_st + j) > i2) {
tr_wrk[j] = 0f;
zero_pad = true;
} else {
tr_wrk[j] = tr_src[i_st+j] * tr_tap[j];
calculate fft
n++;
realft(tr_wrk,n_fft/2,1);
accum results
tr_ans[0] += tr_wrk[0]*tr_wrk[0];
for (j=2; j<n_fft; j+=2) {
tr_ans[j/2] += 2.0 * (tr_wrk[j]*tr_wrk[j] + tr_wrk[j+1]*tr_wrk[j+1]);
tr_ans[n_fft/2] += tr_wrk[1]*tr_wrk[1];
i_st += n_fft/2;
normalize
for (j=0; j<=n_fft/2; j++) {
tr_ans[j] /= ((float)n*wss);
integrate result
delta_f = t_samp*n_fft;
pow_sum = tr_ans[0];
for (j=1; j<n_fft/2; j++) {
pow_sum += tr_ans[j];
pow_sum += tr_ans[n_fft/2];
convert to units^2/Hz
for (j=0; j<n_fft/2; j++) {
tr_ans[j] = tr_ans[j]/delta_f;
//delta_f = (t_samp*n_fft);
return new FrequencySeries(tr_ans, src.getSamplingFrequency()/ (float) tr_ans.length);
//source.getSamplingFrequency()/((float)(2*sPart.length))
public static FrequencySeries powspec1(TimeSeries src, int m) {
float[] rawdata = src.getData();
float[] res = PowSpec.spctrm(rawdata, m, rawdata.length/2, true);
return new FrequencySeries(res, src.getSamplingFrequency()/2f);
* returns coherence spectrum of two traces
* result is a complex vector truncated to Nyquist frequency
public static ComplexVector coherenceSpectrum (TimeSeries trace1, TimeSeries trace2) {
if (trace1.getSamplingFrequency() != trace2.getSamplingFrequency())
throw new IllegalArgumentException("Sampling freqs do not match");
if (trace1.getDataLength() != trace2.getDataLength())
throw new IllegalArgumentException("vectors length do not match");
ComplexVector spec1, spec2, cohSpec;
spec1 = spectrum(trace1);
spec2 = spectrum(trace2);
return (ComplexVector)spec1.mul(spec2.conjugate());
* returns a given part of coherence spectrum of two traces
public static FrequencySeries coherenceSpectrum (TimeSeries trace1, TimeSeries trace2, int part) {
float[] res = extractPart(coherenceSpectrum(trace1,trace2), part);
return new FrequencySeries(res, trace1.getSamplingFrequency()/(float)(2*res.length));
* XCorellation of two vectors
* @param v1 first vector
* @param v2 second vector
public static Vector1D corellation(Vector1D v1, Vector1D v2) {
if (v1.getDataLength() != v2.getDataLength())
throw new IllegalArgumentException("vectors length do not match");
ComplexVector sp1, sp2, res;
sp1 = DFFT(new ComplexVector(v1.getData(),null), true);
sp2 = DFFT(new ComplexVector(v2.getData(),null), true);
res = DFFT((ComplexVector)sp1.mul(sp2.conjugate()), false);
float[] data = res.getDataAmplitudePart();
float[] data2 = new float[data.length/2];
System.arraycopy(data,0, data2, 0, data2.length); data2[0] = data2[1];
return new Vector1D(data2);
* Computes a sonogram for a trace
* This is an optimized algorithm,
public static Matrix sonogram(TimeSeries data, float stepSec, float window, int taperType, float taperFraction) {
LinkedList frq = new LinkedList();
float sampling = data.getSamplingFrequency();
int step = Math.round(sampling*stepSec);
DataWindow currentWindow = data.getWindow();
data.setMessagesAllowed(false);
DataWindow win = new DataWindow();
win.startOffset = currentWindow.startOffset;
win.length = Math.round(window*sampling);
boolean computing = true;
float[] tgt = null;
int leng = 0;
if (step < 1)
step = 1;
System.err.println("COMPUTING SONOGRAM: step="+stepSec+" ("+step+") length="+window+" ("+win.length+")");
while (computing) {
data.setWindow(win);
ComplexVector spec;
float[] src = taper(data, taperFraction, taperType).getTotalData();
spec = DFFT(new ComplexVector(src,null), DIRECT);
leng = spec.getDataPointsNumber() / 2;
tgt = new float[leng];
spec.getDataAmplitudePart(tgt);
src = extractPart(spec, AMPLITUDE, tgt);
tgt = new float[ftlen];
System.arraycopy(src,0,tgt,0,tgt.length);
tgt = src;
// --- THIS CODE SHOULD BE REMOVED
for (int i=0; i < tgt.length; i++)
tgt[i] = (tgt[i] > 0) ? (float)Math.log(tgt) : tgt[i];
//tgt = smooth(tgt, Math.round(.05f*tgt.length));
// --- THIS CODE SHOULD BE REMOVED
//System.err.println("Step: "+win.startOffset+":"+win.length);
frq.add(tgt);
win.startOffset += step;
if (win.getEnd() > currentWindow.getEnd())
computing = false;
data.setWindow(currentWindow);
data.setMessagesAllowed(true);
Matrix m;
m = new Matrix(frq.size(), leng);
for (int i=0; i < frq.size(); i++)
m.setColumn(i,(float[])frq.get(i));
m.setBounds(data.getActiveRegionOffsetSeconds(), data.getActiveRegionOffsetSeconds()+data.getDuration(),
0f, data.getSamplingFrequency()/2f);
return m;
public static double[] toDouble(float[] data) {
double[] ret = new double[data.length];
for (int i=0; i < data.length; i++)
ret[i] = data[i];
return ret;
* Differentiate a trace
public static TimeSeries differentiate (TimeSeries src) {
int ndat;
float t_samp;
int i;
float[] tr;
float buff;
float buff0;
ndat = src.getDataLength();
t_samp = 1f/src.getSamplingFrequency();
tr = src.getData();
buff0 = tr[0];
tr[0] *= 2f/t_samp;
for(i=1;i<ndat;i++)
buff = tr[i];
tr[i] = (tr[i] - buff0)/t_samp;
buff0 = buff;
return (TimeSeries)src.newInstance(tr);
* Integrate a trace
* @param source source trace
* @param method method to use: Trapezoid or Tick rule
* @return integrated trace
public static TimeSeries integrate(TimeSeries source, int method) {
if (method == Params.TRAPEZOID)
return Integrate.trapRule(source);
else if (method == Params.TICK)
return Integrate.tickRule(source);
else
throw new IllegalArgumentException("Invalid method "+method);
* Integrates a trace using Tick's rule
* @param source source trace
* @return integrated trace
public static TimeSeries integrate(TimeSeries source) {
return integrate(source, Params.TICK);
* Trace resampling
* @param data source trace
* @param newSampFreq new sampling frequency
* @return new resampled trace
public static TimeSeries resample(TimeSeries data, float newSampFreq) {
float sampFreq = data.getSamplingFrequency();
float[] newdata = interpolate(data.getData(), sampFreq, newSampFreq);
TimeSeries res = (TimeSeries)data.newInstance(newdata);
res.samplingFrequency = newSampFreq;
return res;
* Generic moving average window smoothing. <BR>
* @param src source array
* @param nx2 half window length
public static Vector1D smooth(Vector1D src, int nx2) {
return src.newInstance( smooth(src.getData(), nx2) );
* Generic moving average window smoothing
* @param src source array
* @param nx2 half window length
public static float[] smooth(float[] src, int nx2) {
int ndat = src.length;
float[] res = new float[ndat];
//System.arraycopy(src, 0, res, 0, ndat);
float sum1, sum2;
int i, j, k;
//System.err.println("NX2 = "+nx2);
jpitsa.Out.cerr.println("data = "+src.length+"NX2 = "+nx2);
for(i=nx2;i<=ndat-(nx2+1);i++) {
sum1=0f; sum2=0f;
for(j=1;j<=nx2;j++) {
sum1 = sum1 + src[i-j];
sum2 = sum2 + src[i+j];
res[i] = (sum1+sum2+src[i])/(float)(2*nx2+1);
for(i=1;i<=nx2-1;i++) {
sum1=0f;
sum2=0f;
k = 0;
for(j=1;j<=i;j++) {
sum1 = sum1+ src[i-j];
sum2 = sum2+ src[i+j];
k = j;
res[i] = (sum1+sum2+src[i])/(float)(2*k+1);
for(i=1;i<=nx2-1;i++) {
sum1 = sum2 = 0f;
k = 0;
for(j=1;j<=i;j++) {
sum1 = sum1+ src[ndat-1-i-j];
sum2 = sum2+ src[ndat-1-i+j];
k = j;
res[ndat-1-i] = (sum1+sum2+src[ndat-1-i])/(float)(2*k+1);
res[ndat-1] = src[ndat-1];
res[0] = src[0];
return res;
* Generic 4-point spline interpolation method.
* @param data source data
* @param oldSampFreq source sampling frequency (1/sampling interval)
* @param newSampFreq target sampling frequency
public static float[] interpolate(float[] data, // source data
float oldSampFreq, // old sampling freq. [Hz]
float newSampFreq) // new samp. freq. [Hz]
int n_int = 4; /* degree of polynomial for interpoltion */
float xa[]= new float[n_int+1]; /* interpolation buffer */
float ya[]= new float[n_int+1]; /* interpolation buffer */
int closest_sample=-1, int_start_sample=-1;
float delta_value = 0f; /* error estimate for interpolated value */
// this is because PITSA and JPITSA use different schemes for sampling freq. storing
float t_samp_old = 1f / oldSampFreq;
float t_samp_new = 1f / newSampFreq;
int ndat = data.length;
float x1=t_samp_old/t_samp_new;
x1 *= (float)ndat;
int ndat2 = Math.round(x1+5e-1f); // Number of data in new arrary
float[] tr1 = data;
float[] b1 = new float[ndat2];
float[] prom_res= new float[2]; // temp. buffer for polint() procedure
// 4-point Spline interpolation procedure
float new_x;
for (int j = 0; j < ndat2;j++){
new_x = (float)j*t_samp_new;
/* determine index of closest sample in trace */
closest_sample = (int)(new_x/t_samp_old);
if ((closest_sample >= (int)((float)n_int/2.)) &&
(closest_sample <= ndat - (int)((float)n_int/2.) - 1))
int_start_sample = closest_sample - (int)((float)n_int/2.) - 1;
}else if (closest_sample < (int)((float)n_int/2.)) {
int_start_sample = -1;
}else if (closest_sample > ndat - (int)((float)n_int/2.) - 1) {
int_start_sample = ndat -1 - n_int;
for (int jj = 1;jj <= n_int; jj++) {
ya[jj] = tr1[int_start_sample + jj];
xa[jj] = (int_start_sample + jj)*t_samp_old;
prom_res[0] = x1; prom_res[1] = delta_value;
polint(xa,ya,n_int,new_x, prom_res);
b1[j] = x1 = prom_res[0]; delta_value = prom_res[1];
return b1;
* Generic 4-point spline interpolation method.
* @param data source data
* @param newLength number of points in a new array
public static float[] interpolate(float[] data, int newLength) {
int n_int = 4; /* degree of polynomial for interpoltion */
float xa[]= new float[n_int+1]; /* interpolation buffer */
float ya[]= new float[n_int+1]; /* interpolation buffer */
int closest_sample=-1, int_start_sample=-1;
float delta_value = 0f; /* error estimate for interpolated value */
// this is because PITSA and JPITSA use different schemes for sampling freq. storing
float t_samp_old = 1f / oldSampFreq;
float t_samp_new = 1f / newSampFreq;
int ndat = data.length;
float x1=t_samp_old/t_samp_new;
x1 *= (float)ndat;
int ndat2 = Math.round(x1+5e-1f); // Number of data in new arrary
int ndat = data.length;
int ndat2 = newLength;
float t_samp_old = 1f;
float t_samp_new = ((float)ndat)/((float)ndat2);
float x1 = (float)ndat2;
float[] tr1 = data;
float[] b1 = new float[ndat2];
float[] prom_res= new float[2]; // temp. buffer for polint() procedure
// 4-point Spline interpolation procedure
float new_x;
for (int j = 0; j < ndat2;j++){
new_x = (float)j*t_samp_new;
/* determine index of closest sample in trace */
closest_sample = (int)(new_x/t_samp_old);
if ((closest_sample >= (int)((float)n_int/2.)) &&
(closest_sample <= ndat - (int)((float)n_int/2.) - 1))
int_start_sample = closest_sample - (int)((float)n_int/2.) - 1;
}else if (closest_sample < (int)((float)n_int/2.)) {
int_start_sample = -1;
}else if (closest_sample > ndat - (int)((float)n_int/2.) - 1) {
int_start_sample = ndat -1 - n_int;
for (int jj = 1;jj <= n_int; jj++) {
ya[jj] = tr1[int_start_sample + jj];
xa[jj] = (int_start_sample + jj)*t_samp_old;
prom_res[0] = x1; prom_res[1] = delta_value;
polint(xa,ya,n_int,new_x, prom_res);
b1[j] = x1 = prom_res[0]; delta_value = prom_res[1];
return b1;
* Butterworth Band Pass Filter
* implements Band, Low and High Pass filters
* All three Butterworth filters are recursive time domain filters
* using the bilinear z-transform design after Stearns (1984)
* They are applied in section of 30 dB/decade or 12 Db/octave for
* the slope of the transition band. They may be given zero phase
* characteristic by filterin the reversed filtered time seris
* again (forwards-backwards filtering)
* Finally, the trace is reversed to its original orientation
* based on spr_bp_bworth (spr/spr_bpbt.c)
* @author Denis Mishin ([email protected]) - Java code
* @author PITSA team - original C code
* @param trace input trace
* @param flo low cut corner frequency [Hz]
* @param fhi high cut corner frequency [Hz]
* @param ns number of filter passes [Hz]
* @param is_zph TRUE -> zero phase filter
* @return new filtered trace
public static TimeSeries bandpassFilter(TimeSeries trace,
float flo,
float fhi,
int ns,
boolean is_zph)
final int MAX_SEC = 10;
int i, k; /* index */
int n,m,mm;
int ndat; /* number of points in trace */
double tsa;
double a[] = new double[MAX_SEC+1];
double b[] = new double[MAX_SEC+1];
double c[] = new double[MAX_SEC+1];
double d[] = new double[MAX_SEC+1];
double e[] = new double[MAX_SEC+1];
double f[][] = new double[MAX_SEC+1][6];
double temp;
double c1,c2,c3;
double w1,w2,wc,q,p,r,s,cs,x;
float tr[];
ndat = trace.getDataLength();
tsa = 1f / trace.getSamplingFrequency();
tr = trace.getData();
// remove mean
float mean = mean(tr);
for (i=0; i < tr.length; i++)
tr[i] -= mean;
/* design filter weights */
/* bandpass */
w1 = java.lang.Math.sin(flo*java.lang.Math.PI*tsa)/java.lang.Math.cos(flo*java.lang.Math.PI*tsa);
w2 = java.lang.Math.sin(fhi*java.lang.Math.PI*tsa)/java.lang.Math.cos(fhi*java.lang.Math.PI*tsa);
wc=w2-w1;
q=wc*wc +2.0*w1*w2;
s=w1*w1*w2*w2;
for (k=1;k<=ns;k++)
c1 = (float)(k+ns);
c2 = (float)(4*ns);
c3 = (2.0*c1-1.0)*java.lang.Math.PI/c2;
cs = java.lang.Math.cos(c3);
p = -2.0*wc*cs;
r = p*w1*w2;
x = 1.0+p+q+r+s;
a[k]= wc*wc/x;
b[k]= (-4.0 -2.0*p+ 2.0*r+4.0*s)/x;
c[k]= (6.0 - 2.0*q +6.0*s)/x;
d[k]= (-4.0 +2.0*p -2.0*r +4.0*s)/x;
e[k]= (1.0 - p q-r s)/x;
/* set initial values to 0 */
for(n=0;n<=MAX_SEC;n++)
for(m=0;m<=5;m++)
f[n][m]=0.0;
/* filtering */
for (m=1;m<=ndat;m++) {
f[1][5]= tr[m-1];
/* go thru ns filter sections */
for(n=1;n<=ns;n++)
temp=a[n]*(f[n][5]-2.0*f[n][3] +f[n][1]);
temp=temp-b[n]*f[n+1][4]-c[n]*f[n+1][3];
f[n+1][5]=temp-d[n]*f[n+1][2]-e[n]*f[n+1][1];
/* update past values */
for(n=1;n<=ns+1;n++)
for(mm=1;mm<=4;mm++)
f[n][mm]=f[n][mm+1];
/* set present data value and continue */
tr[m-1] = (float)f[ns+1][5];
// System.out.println("tr ["+(m-1)+"] = "+tr[m-1]);
if (is_zph == true) {
/* filtering reverse signal*/
for (m=ndat;m>=1;m--) {
f[1][5]= (double)tr[m-1];
/* go thru ns filter sections */
for(n=1;n<=ns;n++)
temp=a[n]*(f[n][5]-2.0*f[n][3] +f[n][1]);
temp=temp-b[n]*f[n+1][4]-c[n]*f[n+1][3];
f[n+1][5]=temp-d[n]*f[n+1][2]-e[n]*f[n+1][1];
/* update past values */
for(n=1;n<=ns+1;n++)
for(mm=1;mm<=4;mm++)
f[n][mm]=f[n][mm+1];
/* set present data value and continue */
tr[m-1] = (float)f[ns+1][5];
// restore mean
for (i=0; i < tr.length; i++)
tr[i] += mean;
return (TimeSeries)trace.newInstance(tr);
* Gaussian filter. <BR>
* Removes mean by default
public static TimeSeries gaussianFilter(TimeSeries src, float fCent, float alpha) {
return gaussianFilter(src, fCent, alpha, true);
* Gaussian bandpass filter
* @param src source trace
* @param fCent central frequency value
* @param alpha bandwidth
* @param rmean remove mean first flag
* @return new filtered vector
public static TimeSeries gaussianFilter(TimeSeries src, float fCent, float alpha, boolean rmean) {
float[] fc = new float[1]; fc[0] = fCent;
float[] al = new float[1]; al[0] = alpha;
return gaussianFilter(src, fc, al, rmean);
* Gaussian bandpass filter
* @param src source trace
* @param fCent central frequency values
* @param alpha bandwidths
public static TimeSeries gaussianFilter(TimeSeries src, float fCent[], float alpha[], boolean rmean) {
float[] sourceData = src.getData();
float mean = 0f;
int i;
if (rmean) {
mean = mean(sourceData);
for (i=0; i < sourceData.length; i++)
sourceData[i] -= mean;
ComplexVector spec = DFFT(new ComplexVector(src.getData(),null), true);
int npoints = spec.getDataPointsNumber();
float nyq = src.getSamplingFrequency()/2f;
// ---- computing the Gaussian distribution function
float[] gaus = new float[npoints];
float freqIncrement = (2f*nyq)/((float)npoints);
int cp = 0; float f = 0f;
while (f <= nyq && cp < (npoints/2) ) {
gaus[cp] = Filter.gaussianWindow(f,fCent,alpha);
cp++; f += freqIncrement;
int last_index = gaus.length-1;
for (cp=0; cp < (npoints/2); cp++)
gaus[last_index - 1] = gaus[cp];
float[] real = extractPart(spec,Params.REAL);
float[] imag = extractPart(spec,Params.IMAGINARY);
//System.out.println("Gaus: real.length="+real.length+" spec.length="+npoints+
// " stop at "+f+" nyq="+nyq);
real = multiplicate(real,gaus);
imag = multiplicate(imag,gaus);
//real = glue(real, invert(real));
//imag = glue(imag, invert(imag));
ComplexVector inv = DFFT(new ComplexVector(real,imag), Params.INVERSE);
real = extractPart(inv, Params.REAL);
float[] data = new float[real.length/2];
System.arraycopy(real,0,data,0,data.length);
TimeSeries result = new TimeSeries(data, nyq*2f);
float[] data = sourceData;
System.arraycopy(real,0,data,0,data.length);
if (rmean) {
for (i=0; i < data.length; i++)
data[i] += mean;
TimeSeries result = (TimeSeries)src.newInstance(data);
return result;
* Discretisation of source trace data
* Discretization will treat the input trace as a pseudo-continuous trace from which -
Why can't created an object in the "public static void main(String args[])"
Example:
public Class Exp {
public static void main(String args[])
new Exp2();-------------> To Occur Error
Class Exp2 {
public Exp2()You can't create an inner class within main, because
it is a static method. Inner classes can only be
created by true class methods.This is not correct. You can create an inner class object in a static method. You just have to specify an outer class object that the inner class object should be created within:
Exp2 exp2 = new Exp().new Exp2(); -
hi everybody,
I am attending data structure and alogrithms class ...i wanna know about all, so which book can I read to understand.
Also in java what is the meaning of
"public static int"....
it have got "return" what is the meaning it ??
best regards
blazerPerhaps you should try the Java forums and not the Sun Ray forum :)
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!! help using: public static Boolean valueOf(String s)
I am trying to use this simple function to convert a string value to a boolean. According to the documentation for this Boolean method (public static Boolean valueOf(String s)), this should work:
Example: Boolean.valueOf("True") returns true.
As a test, I tried to run this line of code:
tmp_bool = Boolean.valueOf("True");
I get this compilation error:
test_file.java:10: incompatible types
found : java.lang.Boolean
required: boolean
tmp_bool = Boolean.valueOf("True");
.....................................^
According to the documentation for SDK 1.4, there is a new function:
public static Boolean valueOf(boolean b)
It seems like the commpiler is focusing on this new version of the valueOf() method, and ignoring the case where a String is the parameter. Why won't it use the version that takes a String? What confuses me even more is that I am running version 1.3.1, and the new valueOf(boolean b) function is not mentioned in its documentation.
Am I somehow using the method wrong?
Thanks!OK, I think I understand now. Thanks.
Let me make sure i have this right...
So basically, if you use variable types of Boolean and need to pass them to methods that take booleans, would you have to call the booleanValue method first?
ex:
Boolean bool_obj;
//example method that takes a boolean
//test_method(boolean b);
test_method ( bool_obj.booleanValue() );
is that right? -
Proper setup for a network with Public Static IPs and Private IPs
hello all-
i am trying to setup a network with public static IP addresses and local (internal) IP addresses with 192.168.xxx.xxx format. i will try to explain as best i can how i have it set up and what my issues are.
i have COX business services in my home and 8 static public IPs assigned to me. i have tried setting this up and everything internally (192.168.xxx.xxx) works fine and all the devices can get to the outside world fine but when i try to access ANY of the devices on the public IPs from outside the network i get absolutely nothing. the browser just times out and i cannot ping the devices even though COX can see and says the devices are bridging over. COX is unable to get a response when they ping the devices either.
one of the devices is a Synology NAS with one Ethernet port that is using a public IP and the other using a 192.168.xxx.xxx address. when the Ethernet port is setup using a static public IP COX can see it but they get no response from a ping and when they go to the address to get the login page the browser times out. when i reconfigure the port for DHCP it grabs a public DHCP address and when COX pings that they get a response AND they are able to type the DHCP adress in their browser and get to the login page no problem. when i switch back to the static IP they can see it but again are unable to get a response from a ping and are unable to go to the login page.
my setup is:
COX Modem (only has 1 Ethernet port) ====>> 8 port NETGEAR Gigabit switch (all devices with Public IPs are plugged into the NETGEAR switch)
NETGEAR switch ====>> WAN Port on Airport Extreme (latest version w/all software updates)
LAN Port Airport Extreme ====>> CISCO 2960 48 port Gigabit Switch (all internal devices are plugged into the CISCO switch)
like i said everything with the 192.168.xxx.xxx connects and i can connect to just fine but none of the devices with public static IPs can be pinged even though COX can see them bridging over. i have tried all new cables on the devices and that didn't work so it has to be something with my setup.
do i need to add another router to this configuration because i have extra airport extremes lying around i can use if someone could just tell me how the setup should be. i also have a few ports open on the CISCO switch; is there a way i can use it for the 4-5 devices that have public IPs? or will that cause a problem with all the other devices plugged into it with the 192.168.xxx.xxx IP addresses?
i'm not a networking guru (obviously) so if you are able to help me get this setup properly can you try not to use Doctoral Level syntax in your response? i would greatly appreciate it!
i appreciate any and all help... thx in advance!Duplicate posts.
Go HERE. -
What should I do I do not want chrome
What should I do I do not want chrome
Settings-apps-all-chrome,disable.Download other browser from google play.
All we have to decide is what to do with the time that is given to us - J.R.R. Tolkien -
Public Holiday calendar not to be taken into account for Sick Leave
Dear All,
I need help.
Public Holiday calendar not to be taken into account for Sick Leave.
Eg -When I employee applies for sick leave, the public holiday in between the dates shouldnt be considered. How can I configure this requirement.
Please help.
Regards,
PoornimaFor that group, you need 2 counting rules:
- one for Holiday Class 0 (not a public holiday) and Day Work Schedule Class 0 (not a working day)
- one for Holiday Class 0 (not a public holiday) and Day Work Schedule Class 1 to 9 (a working day)
If you want, you can add an other one or two for Holiday Class 1 to 9 (public holiday)
extract from our T556C
2 1 10 Q 10 Sick leave deduct from quotas (incl personal/spec) XXXXX X X XXXXXXXXXX XXXXXXXXX X X XX XX 100.00 100.00 1 1 10
2 1 10 Q 11 Sick leave deduct from quotas (incl personal/spec) XXXXX X X XXXXXXXXXX X X X XX XX 0.00 0.00 1 1 10
2 1 30 Q 10 Special leave with pay (with quotas deduction) XXXXX X X XXXXXXXXXX XXXXXXXXX X X XX XX 100.00 100.00 1 1 30
2 1 30 Q 11 Special leave with pay (with quotas deduction) XXXXX X X XXXXXXXXXX X X X XX XX 0.00 0.00 1 1 30
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Hi, I am getting following error with oracle IIS plug in. Thanks you for your help. Let me know if further information is required. Here is my proxy config file: oproxy.serverlist=v3appec2 oproxy.v3appec2.hostname=vsgnyweblogic1.vitech.com oproxy.v3a
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Lightroom paste settings not working
I have noticed this problem in every edition of LR4. About 50% of the time right-click paste settings in develop module does not appear work.Typically this will happen when I have quickly selected a new image in the filmstrip and tried to paste setti