How to call derived class to base class
Hello everybody,
I create a GUi application in java swing. Now i want to navigate between the screen but the timing between the screen is very slow bcoz i imported the class from package to another package. Now i want to extends one package to another package to reduce the navigation time but it saying error bcoz i cant able to call my derived class to base class. if anyone know the answer for this please answer this immediately.
If any other method is there to optimise the navigation time please tell me
by
(kamal)
Sorry, I've got major difficulties understanding your query:
I create a GUi application in java
ication in java swing. ok
Now i want to navigate between
the screenwhat? switch screens? display a different dialog?
but the timing between the screen is very
slowtiming? do you mean the time it takes to display a different dialog?
bcoz i imported the class from package to
another package.how did you come to the conclusion that that is the reason for the slowness? Did you do any profiling or is this just guess-work?
Similar Messages
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How to call a Derived call fucntion with a base class object ?
Hi all
i am working on a JNI interface to Java, and in the process of simulating a C++ behaviour in java
so i need some help form you people, in this regard.
here is a c++ code, i need a equivalent fucntionality in java , to put it one word, the question is
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class Base
public:
Base()
~Base()
virtual void F1()
cout<<"The BASE::F1() is called"<<endl;
virtual void F2()
cout<<"The BASE::F2() is called"<<endl;
class Derived : public Base
public:
Derived()
~Derived()
virtual void F3()
cout<<"The Derived::F3() is called"<<endl;
virtual void F4()
cout<<"The Derived::F4() is called"<<endl;
Base * GetDerived()
return new Derived();
int _tmain(int argc, _TCHAR* argv[])
Base *ptr = NULL;
ptr = GetDerived();
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dPtr->F3();
}regards
pradishJust to clarify a point that I consider important--the distinction between references and objects:
Your subject is: How to call a Derived call fucntion with a base class object ? The answer to that is: You cannot. It is completely impossible in Java. If you have a base class object, the derivced class' methods are not present. On the other hand, if you have a compile-time reference of the parent type, but at runtime it happens to point to an instance of the derived class, then, as pointed out, you can cast the reference. (Note that casting does not apply to objects.) -
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Thanks.
Bruno.Hi Schiller,
The codes are the following:
COMECO
import javax.swing.UIManager;
import java.awt.*;
import java.net.*;
import java.io.*;
import java.awt.event.*;
import javax.swing.*;
//Main method
class comeco {
public static void main(String[] args) {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
catch(Exception e) {
AGORA testeagora=new AGORA();
// Code for socket
int port;
ServerSocket server_socket;
BufferedReader input;
try {
port = Integer.parseInt(args[0]);
catch (Exception e) {
System.out.println("comeco ---> port = 1500 (default)");
port = 1500;
try {
server_socket = new ServerSocket(port);
System.out.println("comeco ---> Server waiting for client on port " +
server_socket.getLocalPort());
// server infinite loop
while(true) {
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System.out.println("comeco ---> New connection accepted " +
socket.getInetAddress() +
":" + socket.getPort());
input = new BufferedReader(new InputStreamReader(socket.getInputStream()));
// print received data
try {
while(true) {
String message = input.readLine();
if (message==null) break;
System.out.println("comeco ---> " + message);
testeagora.teste(message);
catch (IOException e) {
System.out.println(e);
// connection closed by client
try {
socket.close();
System.out.println("Connection closed by client");
catch (IOException e) {
System.out.println(e);
catch (IOException e) {
System.out.println(e);
AGORA
import javax.swing.UIManager;
import java.awt.*;
import java.awt.event.*;
import java.net.*;
import java.io.*;
import javax.swing.*;
import java.net.*;
//public class AGORA {
public class AGORA {
boolean packFrame = false;
//Construct the application
public AGORA() {
try {
Main frame = new Main();
System.out.println("agora ---> Criou o frame");
//Validate frames that have preset sizes
//Pack frames that have useful preferred size info, e.g. from their layout
if (packFrame)
frame.pack();
else
frame.validate();
//Center the window
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
Dimension frameSize = frame.getSize();
if (frameSize.height > screenSize.height)
frameSize.height = screenSize.height;
if (frameSize.width > screenSize.width)
frameSize.width = screenSize.width;
frame.setLocation((screenSize.width - frameSize.width) / 2, (screenSize.height - frameSize.height) / 2);
frame.setVisible(true);
catch(Exception e)
{ System.out.println("agora ---> " +e);
// Tem que criar a THREAD e ver se funciona
public void remontar (final String msg) {
try {
System.out.println("agora ---> Passou pelo Runnable");
System.out.println("agora --> Mensagem que veio do comeco para agora: "+ msg);
Main.acao(msg);
catch(Exception x) {
x.printStackTrace();
MAIN
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import com.borland.jbcl.layout.*;
import javax.swing.border.*;
import java.net.*;
import java.io.*;
public class Main extends JFrame {
// ALL THE CODE OF THE INTERFACE
//Construct the frame
public Main() {
enableEvents(AWTEvent.WINDOW_EVENT_MASK);
try {
jbInit();
catch(Exception e) {
e.printStackTrace();
public void acao() {
// C�digo para mudar a interface
Runnable setTextRun=new Runnable() {
public void run() {
try {
System.out.println("main ---> Passou pelo Runnable");
TStatus.setText("main ---> Funcionou");
catch(Exception x) {
x.printStackTrace();
System.out.println("main ---> About to invokelater");
SwingUtilities.invokeLater(setTextRun);
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// Aqui vai entrar o m�todo para ouvir as portas sockets.
// Ele deve ouvir e caso haja alguma nova mensagem, trat�-la para
// alterar as vari�veis e redesenhar os pain�is
// Al�m disso, o bot�o de refresh deve aparecer ativo em vermelho
//Component initialization
private void jbInit() throws Exception {
// Initialize the interface
//Setting | Host action performed
public void SetHost_actionPerformed(ActionEvent e) {
int port;
ServerSocket server_socket;
BufferedReader input;
System.out.println("main ---> port = 1500 (default)");
port = 1500;
try {
server_socket = new ServerSocket(port);
System.out.println("main ---> Server waiting for client on port " +
server_socket.getLocalPort());
// server infinite loop
while(true) {
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System.out.println("main ---> New connection accepted " +
socket.getInetAddress() +
":" + socket.getPort());
input = new BufferedReader(new InputStreamReader(socket.getInputStream()));
String espaco=new String(": ");
JLabel teste2=new JLabel(new ImageIcon("host.gif"));
PHost.add(teste2);
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repaint();
System.out.println("main ---> Redesenhou a interface");
setVisible(true);
// print received data
try {
while(true) {
String message = input.readLine();
if (message==null) break;
System.out.println("main ---> " + message);
catch (IOException e2) {
System.out.println(e2);
// connection closed by client
try {
socket.close();
System.out.println("main ---> Connection closed by client");
catch (IOException e3) {
System.out.println(e3);
catch (IOException e1) {
System.out.println(e1);
public void OutHost_actionPerformed(ActionEvent e) {
repaint();
setVisible(true);
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public void helpAbout_actionPerformed(ActionEvent e) {
Main_AboutBox dlg = new Main_AboutBox(this);
Dimension dlgSize = dlg.getPreferredSize();
Dimension frmSize = getSize();
Point loc = getLocation();
dlg.setLocation((frmSize.width - dlgSize.width) / 2 + loc.x, (frmSize.height - dlgSize.height) / 2 + loc.y);
dlg.setModal(true);
dlg.show();
//Overridden so we can exit on System Close
protected void processWindowEvent(WindowEvent e) {
super.processWindowEvent(e);
if(e.getID() == WindowEvent.WINDOW_CLOSING) {
fileExit_actionPerformed(null);
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public void run() {
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System.out.println("main --> Mensagem que veio do agora para main: "+ msg);
TStatus.setText(msg);
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x.printStackTrace();
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SwingUtilities.invokeLater(setTextRun);
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[]�s. -
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Accessing private field of Derived object in Base class
Hi,
I have this piece of code I wrote a while ago to test something. The issue is accessing a private field of Base class in Base but of a Derived object.
Here is the code:
class Base
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}The commented code does not work but casting d to Base does.
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Forgot to mention that the compilation error is that x has private access in Base.
Thank you.
Edited by: 953012 on Apr 1, 2013 8:42 AM>
As I understand the explanation says that you can access any private member within the code of the class that encloses the private member. So in this case x is the private member and the line of code (return d.x) is in Base which encloses the private member. Does it have to do with the fact that the Derived class does not in fact inherit the private members of Base?
>
It has to do with the entire quote from the spec
>
A private class member or constructor is accessible only within the body of the top level class (§7.6) that encloses the declaration of the member or constructor. It is not inherited by subclasses
>
Your code is
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}The 'Derived' class is NOT 'the top level class that encloses the declaration of the member'. It does NOT inherit 'x' which is a private member of 'Base'. As far as the 'Derived' class is concerned 'x' does not exist.
>
If outside Base code I have Derived d = new Derived() and I call d.getX() then isn't that like calling d.x in myX()?
>
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try {
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RE:How to call a constructor or a .class file using jsp?
try like this:
<%@page import="folder_name.*%>
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<%info.method_name()%>But my GetInfo class reside in this following folder!!!
GetInfo.class location:
D:/jakarta-tomcat-4.1.24/webapps/chart/WEB-INF/classes/GetInfo.class
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<jsp:useBean id="info" class="GetInfo" />
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org.apache.jasper.JasperException: Unable to compile class for JSP
An error occurred at line: -1 in the jsp file: null
Generated servlet error:
[javac] Since fork is true, ignoring compiler setting.
[javac] Compiling 1 source file
[javac] Since fork is true, ignoring compiler setting.
[javac] D:\steve\jakarta-tomcat-4.1.24\work\Standalone\localhost\chart\Configuration_jsp.java:60: cannot resolve symbol
[javac] symbol : class GetInfo
[javac] location: class org.apache.jsp.Configuration_jsp
[javac] GetInfo info = null;
[javac] ^
[javac] D:\steve\jakarta-tomcat-4.1.24\work\Standalone\localhost\chart\Configuration_jsp.java:62: cannot resolve symbol
[javac] symbol : class GetInfo
[javac] location: class org.apache.jsp.Configuration_jsp
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[javac] ^
[javac] D:\steve\jakarta-tomcat-4.1.24\work\Standalone\localhost\chart\Configuration_jsp.java:65: cannot resolve symbol
[javac] symbol : class GetInfo
[javac] location: class org.apache.jsp.Configuration_jsp
[javac] info = (GetInfo) java.beans.Beans.instantiate(this.getClass().getClassLoader(), "GetInfo");
[javac] ^
[javac] 3 errors
at org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:130)
at org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:293)
at org.apache.jasper.compiler.Compiler.generateClass(Compiler.java:353)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:370)
at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:473)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:190)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:295)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:684)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:432)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:356)
at ConfigurationServlet.service(ConfigurationServlet.java:80)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:256)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2415)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:171)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:172)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:223)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:594)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:392)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:565)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:619)
at java.lang.Thread.run(Thread.java:536)
then I put in this code:
<%@page import="GetInfo.*"%>
<jsp:useBean id="info" class="GetInfo" />
<%info.SetElement("VISUAL");
info.startXML();
String Visual = info.ReturnVISUAL();%>
and get the following error:
org.apache.jasper.JasperException: /Configuration.jsp(19,21) equal symbol expected
at org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:94)
at org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:428)
at org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:126)
at org.apache.jasper.compiler.Parser.parseAttribute(Parser.java:169)
at org.apache.jasper.compiler.Parser.parseAttributes(Parser.java:136)
at org.apache.jasper.compiler.Parser.parseAttributes(Parser.java:149)
at org.apache.jasper.compiler.ParserController.figureOutJspDocument(ParserController.java:254)
at org.apache.jasper.compiler.ParserController.parse(ParserController.java:173)
at org.apache.jasper.compiler.ParserController.parse(ParserController.java:153)
at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:227)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:369)
at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:473)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:190)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:295)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:684)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:432)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:356)
at ConfigurationServlet.service(ConfigurationServlet.java:114)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:256)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2415)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:171)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:172)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:223)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:594)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:392)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:565)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:619)
at java.lang.Thread.run(Thread.java:536)Okay, Tomcat doesn't like it when you don't use packages in the WEB-INF/classes folder, don't ask me why, it's just the way it is.
Rewrite your class so it exists in a package:package myclasses;
public class GetInfo { ... }Compile it and put it in the WEB-INF/classes directory so you should have:
WEB-INF/classes/myclasses/GetInfo.class
Your import statement should be:<%@ page import="myclasses.GetInfo" %>and continue coding as before.
Let me know how it goes.
Anthony -
How to call JCS in simple java class
I want to make a atsratup class and this class will have to communicate with a
java controls.But i am not able to create an instance of java control in simple
startup class.
IF any body has called java control in simple java class pls. let me knowHi Surinder,
you can use (some types of) controls with the following code:
Class controlClass = Class.forName("mypackage.MyControl");
MyControl control = (MyControl)WlwProxy.create(controlClass, request);
control.callMethod();
Unfortunatelly it requires a request (or an URL), so you will need some
tricks to use it in a startup class.
This is an internal, undocumneted... call and does not set any
parameters of the control, so use it with care.
Let me know if you can solve your problem, pls
BR,
don
surinder wrote:
I want to make a startup class and this class will have to communicate with a java
controls.But i am not able to create an instance of java control in simple startup
class.
IF any body has called java control in simple java class pls. let me know
"surinder" <[email protected]> wrote:
I want to make a atsratup class and this class will have to communicate
with a
java controls.But i am not able to create an instance of java control
in simple
startup class.
IF any body has called java control in simple java class pls. let me
know -
How to call a method from another class
I have a problem were i have to call a method from another class. What is the command line that i have to use. Thanks.
Here's one I wipped up in 10 minutes... Cool!
package forums;
import javax.swing.JFrame;
import javax.swing.JTextArea;
import krc.utilz.io.Filez;
import java.io.FileNotFoundException;
class FileDisplayer extends JFrame
private static final long serialVersionUID = 0L;
FileDisplayer(String filename) {
super(filename);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
this.setSize(600, 800);
JTextArea text = new JTextArea();
try {
text.setText(Filez.read(filename));
} catch (FileNotFoundException e) {
text.setText(e.toString());
this.add(text);
public static void main(String args[]) {
final String filename = (args.length>0 ? args[0] : "C:/Java/home/src/forums/FileDisplayer.java");
try {
java.awt.EventQueue.invokeLater(
new Runnable() {
public void run() {
new FileDisplayer(filename).setVisible(true);
} catch (Exception e) {
e.printStackTrace();
Filez.read
* reads the given file into one big string
* @param String filename - the name of the file to read
* @return the contents filename
public static String read(String filename) throws FileNotFoundException {
return Filez.read(new FileReader(filename));
* Reads the contents of the given reader into one big string, and closes the reader.
* @param java.io.Reader reader - a subclass of Reader to read from.
* @return the whole contents of the given reader.
public static String read(Reader in) {
try {
StringBuffer out = new StringBuffer();
try {
char[] bfr = new char[BFRSIZE];
int n = 0;
while( (n=in.read(bfr,0,BFRSIZE)) > 0 ) {
out.append(bfr,0,n);
} finally {
if(in!=null)in.close();
return out.toString();
} catch (IOException e) {
throw new RuntimeIOException(e.getMessage(), e);
}Edited by: corlettk on Dec 16, 2007 1:01 PM - dang [code [/tags][
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