How to un:instanceOf
I need to use the java instanceof in one of my jsp, but i'd like to use it by tab library.
I tried to use the unstandard taglib of jakarta but it gets me a strange (in my opinion) error.
I used it in the fllowing way:
<un:instanceOf type="Class value="${instance}">
do something
</un:instanceOf>
The error I got is: "According to TLD, tag un:instanceOf must be empty, but is not"
so.. I don't get how I should use it.. anyone could help me?
thanks!!
I'm afraid the real code isn't helpful... anyway:
<!-- centraline -->
<c:forEach items="${partizione.puntiAutostradali}" var="puntoAutostradale">
<un:instanceOf type="ss.aspi.beans.meteo.centraline.grafica.PuntoRiferimentoBean" value="puntoAutostradale" var="isPuntoRif"/>
<un:instanceOf type="ss.aspi.beans.meteo.centraline.grafica.SingolaCentralinaBean" value="puntoAutostradale" var="isCentralina"/>
<tr><!-- centralina -->
<td class="kilometrica"><c:out value="${puntoAutostradale.kilometricaRel}"/></td>
<td class="tracciato"></td>
<td class="tracciatoRiga"></td>
<td class="tracciato"></td>
<td class="centralinaName" axis="hidable_<c:out value="${partizione.codice}"/>"><c:out value="${puntoAutostradale.descrizione}"/></td>
<td class="campoEl" axis="hidable_<c:out value="${partizione.codice}"/>">
<c:choose>
<c:when test="${isPuntoRif}">PuntoRif</c:when>
<c:when test="${isCentralina}">Centralina</c:when>
<c:otherwise>ERRORE</c:otherwise>
</c:choose>
</td>
<td class="campoEl" axis="hidable_<c:out value="${partizione.codice}"/>">Es.</td>
<td class="campoElMed" axis="hidable_<c:out value="${partizione.codice}"/>">Es.</td>
<td class="campoEl" axis="hidable_<c:out value="${partizione.codice}"/>">Es.</td>
<td class="campoEl" axis="hidable_<c:out value="${partizione.codice}"/>">Es.</td>
<td class="campoEl" axis="hidable_<c:out value="${partizione.codice}"/>">Es.</td>
</tr><!-- fine centralina -->
<tr><!-- separatore -->
<td class="kilometrica"></td>
<td class="tracciato"></td>
<td class="tracciatoRiga"></td>
<td class="tracciato"></td>
<td class="centralinaTotElementsLine" colspan="7" axis="hidable_<c:out value="${partizione.codice}"/>"></td>
</tr><!-- fine separatore -->
</c:forEach>
<!-- fine centraline -->
Similar Messages
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How expensive is an instanceof operation? Is it in the order of simple arithmetic, or of reflection? Does it vary much?
How expensive is an instanceof operation? Is it in
the order of simple arithmetic, or of reflection?
Does it vary much?Between the two, and yes. It's rarely going to be as slow as reflection, but when you get a "hit" it's practically as fast as arithmetic.
So performance is rarely a reason to avoid "sanity tests" in code (remember, instanceof is essentially a check for != null as well as the type of the object).
Try the following code snippet:
import java.util.*;
public class iof
public static void main(String[] argv)
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for(int i = 0; i < c; i++ )
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Iterator i;
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ignoreState = (o instanceof List);
long middle1 = new Date().getTime();
i = content.iterator();
while(i.hasNext())
Object o = i.next();
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ignoreState = (o instanceof String);
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i = content.iterator();
while(i.hasNext())
Object o = i.next();
// Instance of (arithmetic)
ignoreState = ((2 + 2) > 3);
long middle3 = new Date().getTime();
i = content.iterator();
while(i.hasNext())
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ignoreState = ( o.getClass().getName().equals(STRINGNAME) );
long end = new Date().getTime();
System.out.println("Instanceof (Miss) : " + (middle1 - start) + "ms");
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System.out.println("Arithmetic : " + (middle3 - middle2) + "ms");
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private static String STRINGNAME = "java.lang.String";
} -
Hello,
I have a ArrayList.
ArrayList as = new ArrayList();Now i want to allow only string to be added in this arraylist how can i achieve this? Don't want to use generic.
Please guide.Ankur Raiyani wrote:
i have been asked to do not use generic.
In given example where you have seen generics. It is clearly said if you don't want to use generics then use instanceof keyword.
I want such a way that List only allows me to add String if i add other object then it should throw an error.Exactly , i've gave an idea how to use instanceof and allow only string objects in arraylist.
If not clear, please go through the below program:
import java.util.*;
import java.lang.*;
class ArrayListForOnlyString
public static void main(String st[])
List stringArrayList = new ArrayList(){
public ArrayList ar = new ArrayList();
public boolean add(Object ob) throws UnsupportedOperationException
if(ob instanceof String)
ar.add(ob);
return true;
else
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public void add(int index, Object ob)
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ar.add(index,ob);
else
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public Object[] toArray()
return ar.toArray();
public String toString()
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try
stringArrayList.add(new String("10"));
stringArrayList.add(1,new String("10"));
// Uncomment the below line and run, it 'll give error , as you are trying to add Integer Object to array list.
//stringArrayList.add(new Integer("10"));
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}catch(Exception e)
e.printStackTrace();
}Edited by: 833545 on Aug 31, 2011 3:53 PM -
How to determine the type of the jobject... similar to instanceof
hi,
I would like to know how to determine the jobject reference of an instance is of which class.
this is something similar to instanceof we use in java.
is there any thing like 'instanceof' in JNI. if there how to use it?
i got this as objective question for which answers were(i do not remember exactly)
1.instanceof
2.assignedto
i could nt het much help in googling.
thanks in advanceHi
The JNI provides a native version to the java instanceof operator, this function takes two arguments
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jclass myclass = env->FindClass("your class name");
if(env->IsInstanceOf(obj,myclass) == JNI_TRUE)
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}Regards
pradish -
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Thanks in advance,
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Note that the code is not nice, it's just a quick-n-dirty test case I wrote in a few minutes.
Note also that I use Objects in the set method, rather then a String, an Integer and a Main.
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System.out.println(m.getA());
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begining to think that no-one actually knows.What did you expect? You have posted probably the most
unreadable message I have seen for a long time on this forum.
Do yourself a favor and read the following: http://forum.java.sun.com/thread.jsp?forum=31&thread=271751
Also, read this: http://forum.java.sun.com/features.jsp -
How to make a JPanel transparent? Not able to do it with setOpaque(false)
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pack ();
public void itemStateChanged(ItemEvent ee)
public static void main (String [] args)
MPEGPlayer2 mp = new MPEGPlayer2 ("Media Player 2.0");
System.out.println("111111");
class MyPanel extends JPanel
int i=0,j;
public int xc[]= new int[100];
public int yc[]= new int[100];
int a,b,c,d;
public MyPanel()
setOpaque(false);
setBorder(BorderFactory.createLineBorder(Color.black));
JButton bn = new JButton("DrawLine");
this.add(bn);
bn.addActionListener(actionListener);
setBackground(Color.CYAN);
addMouseListener(new MouseAdapter()
public void mouseClicked(MouseEvent e)
saveCoordinates(e.getX(),e.getY());
ActionListener actionListener = new ActionListener()
public void actionPerformed(ActionEvent aae)
repaint();
public void saveCoordinates(int x, int y)
System.out.println("x-coordinate="+x);
System.out.println("y-coordinate="+y);
xc=x;
yc[i]=y;
System.out.println("i="+i);
i=i+1;
public Dimension getPreferredSize()
return new Dimension(500,500);
public void paintComponent(Graphics g)
super.paintComponent(g);
Graphics2D g2D = (Graphics2D)g;
//g2D.setComposite(AlphaComposite.getInstance(AlphaComposite.CLEAR, 0.0f));
g2D.setColor(Color.GREEN);
for (j=0;j<i;j=j+2)
g2D.drawLine(xc[j],yc[j],xc[j+1],yc[j+1]);camickr wrote:
"How to Use Layered Panes"
http://java.sun.com/docs/books/tutorial/uiswing/components/layeredpane.html
Add your video component to one layer and your non-opaque panel to another layer.Did you try that with JMF? It does not work for me. As I said, the movie seems to draw itself always on top! -
Hi
I have created a JPanel in JDeveloper 10.1.3. It has a main method with (see below) but when opened from my application I must use something else than JUTestFrame but what? How should the JPanel be opened the right way?
public static void main(String [] args) {
try {
UIManager.setLookAndFeel("com.jgoodies.looks.plastic.PlasticXPLookAndFeel");
} catch (ClassNotFoundException cnfe) {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (Exception exemp) {
exemp.printStackTrace();
} catch (Exception exemp) {
exemp.printStackTrace();
CurrencyRateEdit panel = new CurrencyRateEdit();
panel.setBindingContext(JUTestFrame.startTestFrame("mypackage.DataBindings.cpx", "null", panel, panel.getPanelBinding(), new Dimension(400,300)));
panel.revalidate();
}Thanks for the input, unfortunately using the JFrame provided by the JDev wizard is what we are trying to avoid. We do not want a JFrame of any kind.
I have it working now with a JPanel as the top level container for the ADF plumbing. This allows me to place the ADF bindings virtually anywhere without any type of boarders. Here is how I did it. (by the way I am still testing out Erik's recommendation)
1) create a default application with an empty runable panel. (the main() can be moved out later but makes it easy for testing) The code here assumes you are using all the default naming in the wizard. If not you will have to make the appropriate changes.
2) Just under the class definition create an instance of a class named "appPanel". This class will be defined below and is a gutted/modified version of JUTestFrame which extends JPanel instead of JFrame. It should look something like this:
public class Panel1 extends JPanel implements JUPanel {
public appPanel canvas = new appPanel();
3) In the main() function change
panel.setBindingContext(JUTestFrame.startTestFrame( ...
to:
panel.setBindingContext(panel.canvas.startTestFrame( ... //canvas is the name I chose in step 2.
4) If, in this test app, you don't already have a container (JForm or other) for the ADF JPanel you can create one for testing like this:
At the bottom of the main() function put :
JFrame xx = new JFrame();
xx.add(panel);
xx.setVisible(true);
5) Create the class file appPanel (menu: new >simple file > Java Class. and replace all of the contents with: (excuse the formatting. I don't know why they don't make developer forums more code friendly)
package mypackage;
import java.awt.Dimension;
import java.awt.Toolkit;
import java.awt.GridLayout;
import java.awt.event.KeyEvent;
import java.beans.PropertyVetoException;
import javax.swing.JPanel;
import javax.swing.JInternalFrame;
import javax.swing.JScrollPane;
import java.util.HashMap;
import oracle.jbo.uicli.UIMessageBundle;
import oracle.jbo.uicli.jui.JUPanelBinding;
import oracle.jbo.uicli.jui.JUEnvInfoProvider;
import oracle.jbo.uicli.controls.JUErrorHandlerDlg;
import oracle.jbo.uicli.controls.JClientPanel;
import oracle.jbo.uicli.binding.JUApplication;
import oracle.jbo.uicli.mom.JUMetaObjectManager;
import oracle.adf.model.BindingContext;
import oracle.adf.model.DataControlFactory;
import oracle.adf.model.binding.DCDataControl;
import oracle.jbo.uicli.controls.*;
public class appPanel extends JPanel
private JUPanelBinding panelBinding = null;
private DCDataControl dataControl;
private BindingContext mCtx;
appPanel frame;
public appPanel() {
try {
jbInit();
} catch (Exception e) {
e.printStackTrace();
public BindingContext startTestFrame(String cpxName, String dcName, JPanel panel, JUPanelBinding panelBinding, Dimension size)
if (!(panel instanceof JUPanel))
System.err.println(UIMessageBundle.getResString(UIMessageBundle.STR_TUI_ERROR_JCLIENTPANEL));
return null;
frame = new appPanel(cpxName, dcName, panelBinding, panel);
frame.adjustFrameSize(size);
return frame.getBindingContext();
public appPanel(JUPanelBinding designTimePanelBinding, JPanel panel)
this.setLayout(new GridLayout());
JScrollPane scPane = new JScrollPane(panel);
this.add(scPane);
JUMetaObjectManager.setBaseErrorHandler(new JUErrorHandlerDlg());
//mom will pass properties in case it's null
JUApplication app = JUMetaObjectManager.createApplicationObject(designTimePanelBinding.getApplicationName(), null, new JUEnvInfoProvider());
panelBinding = new JUPanelBinding(designTimePanelBinding.getApplicationName(), panel);
panelBinding.setApplication(app);
((JClientPanel)panel).setPanelBinding(panelBinding);
panelBinding.execute();
dataControl = app;
public appPanel(String cpxName, String dcName, JUPanelBinding panelBinding, JPanel panel)
this.setLayout(new GridLayout());
JScrollPane scPane = new JScrollPane(panel);
this.add(scPane);
createBindingCtxAndSetUpMenu(cpxName, dcName, panelBinding);
private void createBindingCtxAndSetUpMenu(String cpxName, String dcName, JUPanelBinding panelBinding)
JUMetaObjectManager.setBaseErrorHandler(new JUErrorHandlerDlg());
JUMetaObjectManager.getJUMom().setJClientDefFactory(null);
mCtx = new BindingContext();
HashMap map = new HashMap(4);
map.put(DataControlFactory.APP_PARAMS_BINDING_CONTEXT, mCtx);
JUMetaObjectManager.loadCpx(cpxName, map);
DCDataControl app = (DCDataControl)mCtx.get(dcName);
if (app != null)
dataControl = app;
app.setClientApp(DCDataControl.JCLIENT);
else
mCtx.setClientAppType(DCDataControl.JCLIENT);
panelBinding = panelBinding.setup(mCtx, null);
public DCDataControl getDataControl()
return dataControl;
public BindingContext getBindingContext()
return mCtx;
void adjustFrameSize(Dimension size)
setSize(size);
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
if (size.height > screenSize.height)
size.height = screenSize.height;
if (size.width > screenSize.width)
size.width = screenSize.width;
setLocation((screenSize.width - size.width) / 2, (screenSize.height - size.height) / 2);
setVisible(true);
private static final char MNEMONICINDICATOR = '&';
public static final int MNEMONIC_INDEX_NONE = -1;
* Returns the key code for the mnemonic in the string. Returns
* VK_UNDEFINED if the string does not contain a mnemonic.
public int getMnemonicKeyCode(String string)
if (string == null)
return KeyEvent.VK_UNDEFINED;
// Minus one, because a trailing ampersand doesn't count
int lengthMinusOne = string.length() - 1;
int i = 0; // Index in the source sting
while (i < lengthMinusOne)
int index = string.indexOf(_MNEMONIC_INDICATOR, i);
// Are we at the end of the string?
if ((index == -1) || (index >= lengthMinusOne))
break;
char ch = string.charAt(index + 1);
// if this isn't a double ampersand, return
if (ch != MNEMONICINDICATOR)
// VK_* constants are all for upper case characters
return(int) Character.toUpperCase(ch);
// Skip over the double ampersand
i = index + 2;
return KeyEvent.VK_UNDEFINED;
* Removes non-displayable inline mnemonic characters.
* In order to specify a mnemonic character in a translatable string
* (eg. in a resource file), a special character is used to indicate which
* character in the string should be treated as the mnemonic. This method
* assumes that an ampersand ('&') character is used as the mnemonic
* indicator, and removes (single) ampersands from the input string. A
* double ampersand sequence is used to indicate that an ampersand should
* actually appear in the output stream, in which case one of the ampersands
* is removed.
* Clients should call this method after calling
* StringUtils.getMnemonicIndex() and before displaying the string. The
* returned string should be used in place of the input string when
* displaying the string to the end user. The returned string may be the
* same as the input string if no mnemonic indicator characters are found,
* but this is not guaranteed.
* @see #getMnemonicIndex
public String stripMnemonic(String string)
if (string == null)
return null;
int length = string.length();
// Single character (or empty) strings can't have a mnemonic
if (length <= 1)
return string;
StringBuffer buffer = null;
int i = 0;
while (i < length)
int index = string.indexOf(_MNEMONIC_INDICATOR, i);
// We've reached the append. Append the rest of the
// string to the buffer, if one exists, then exit
if ((index < 0) || (index >= length - 1))
if (buffer != null)
buffer.append(string.substring(i));
break;
if (buffer == null)
// If the string starts with an ampersand, but not a double
// ampersand, then we just want to return
// stripMnemonic(string.substring(1)). This is basically
// what we do here, only I've optimized the tail recursion away.
if ((index == 0) && (string.charAt(1) != MNEMONICINDICATOR))
string = string.substring(1);
length--;
continue;
else
// Allocate the buffer. We can reserve only space
// (length - 1), because, by now, we know there's at least
// 1 ampersand
buffer = new StringBuffer(length - 1);
// Append the bits of the string before the ampersand
buffer.append(string.substring(i, index));
// And append the character after the ampersand
buffer.append(string.charAt(index + 1));
// And skip to after that character
i = index + 2;
// If we never allocated a buffer, then there's no mnemonic
// at all, and we can just return the whole string
if (buffer == null)
return string;
return new String(buffer);
private void jbInit() throws Exception {
And now you have an ADF implementation that exists purely in a JPanel to be placed anywhere.
Again I am still testing Erik's recomendation which may prove to be a better implementation; but I wanted to share what I have working.
I hope this helps someone out. Good luck.
SMartel
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