vineet walia

Strings are reference type in Java, I created a code snippet to validate the same behavior but It doesn't look like working.

Code Snippet:-

public class Main {    public static void main(String[] args) {        String str1 = "Java is fun!";        String str2 = str1;        str1 = "java is not fun ";        System.out.println(str1);        System.out.println(str2);    } }

Output:-

java is not fun
Java is fun!

Expected Output:-

java is not fun
java is not fun

Please suggest book for web service exam certification?

i have to pass this value to jsp variable ..
please suggest how i can do this
i dont know much about struts

<% String [] taskList = null; String tokenid="#session.tokenid"; String strUrl="http://localhost:8080/axis2/services/TaskManagementServices.TaskManagementServicesSOAP/"; String strService="http://localhost:8080/axis2/services/TaskManagementServices.TaskManagementServicesSOAP/"; String SOAPRequest = "<soapenv:Envelope xmlns:soapenv='http://schemas.xmlsoap.org/soap/envelope/' xmlns:q0='http://www.intalio.com/BPMS/Workflow/TaskManagementServices-20051109/' xmlns:xsd='http://www.w3.org/2001/XMLSchema' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'>" +"<soapenv:Body> " +"<q0:getTaskListRequest>" +"<q0:participantToken>"+tokenid+"</q0:participantToken>" +"</q0:getTaskListRequest> " +"</soapenv:Body>" +"</soapenv:Envelope>";


is this a correct way String tokenid="#session.tokenid"; to get value from ongl stack to jsp page ..

one more stupid question..

<% String [] taskList = null; String tokenid="#session.tokenid"; String strUrl="http://localhost:8080/axis2/services/TaskManagementServices.TaskManagementServicesSOAP/"; String strService="http://localhost:8080/axis2/services/TaskManagementServices.TaskManagementServicesSOAP/"; String SOAPRequest = "<soapenv:Envelope xmlns:soapenv='http://schemas.xmlsoap.org/soap/envelope/' xmlns:q0='http://www.intalio.com/BPMS/Workflow/TaskManagementServices-20051109/' xmlns:xsd='http://www.w3.org/2001/XMLSchema' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'>" +"<soapenv:Body> "


is this is correct wayString tokenid="#session.tokenid"; to get that variable inside jsp

thanks a lot man..
its working

from which interface you are implementing action class ..
i am new to struts so dont know that much

my action class is

package intalio; import com.opensymphony.xwork2.ActionContext; import com.opensymphony.xwork2.ActionSupport; import java.io.*; import java.net.MalformedURLException; import java.util.*; import javax.servlet.ServletOutputStream; import javax.servlet.ServletResponse; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import org.apache.struts2.interceptor.RequestAware; import org.apache.struts2.interceptor.ServletRequestAware; import org.apache.struts2.interceptor.SessionAware; import wsdl.ST_01Client; import intalio.soaptoken; public class login extends ActionSupport implements SessionAware { private String userid; private String password; private String tokenid; private String errorid; private int status ; private String errorstatus ; public String getUserid() { return userid; } public void setUserid(String userid) { this.userid = userid; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } Map session = ActionContext.getContext().getSession(); public String execute() { String strUrl="http://localhost:8080/axis2/services/TokenService.Service/"; String strService="http://localhost:8080/axis2/services/TokenService.Service/"; String strUserName =userid; String strPassword = password; String strToken = ""; String strerror=""; String SOAPRequest = "<soapenv:Envelope xmlns:soapenv='http://schemas.xmlsoap.org/soap/envelope/' xmlns:q0='http://tempo.intalio.org/security/tokenService/' xmlns:xsd='http://www.w3.org/2001/XMLSchema' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'> <soapenv:Body> <q0:authenticateUser> <q0:user>"+strUserName+"</q0:user> <q0:password>"+strPassword+"</q0:password> </q0:authenticateUser> </soapenv:Body> </soapenv:Envelope>"; String strFile=SOAPRequest; ST_01Client objClient=new ST_01Client(); objClient.setValue(strFile); objClient.setRequest(strUrl,strService,objClient.getValue()); String obj=""; try { obj=objClient.getRequest(); } catch (MalformedURLException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } // to get token strToken = obj.substring(obj.indexOf("<tokenws:token>")+16,obj.indexOf("</tokenws:token>")); strToken = strToken.trim(); strToken= tokenid; // to get error // strerror = obj.substring(obj.indexOf("<soapenv:Fault>")+16,obj.indexOf("<soapenv:Fault>")); // strerror = strToken.trim(); // strerror= tokenid; // session variable value session.put("tokenid",tokenid); if(obj.equals("")) { status= 0 ; } else { status= 1; } if(status==1) { return "SUCCESS"; } else { return "error"; } } // execute method end public void setSession(Map session) { session= this.session; } }

my jsp is
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%> <%@taglib uri="/struts-tags" prefix="s"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>Task List Page</title> </head> <body> <s:property value="#session.tokenid"/> <s:property value="%{#session.tokenid}"/> <s:property value="session.get(tokenid)"/> <h3>Task list page</h3> </body> </html>


i am using session.put("tokenid",tokenid); to set tokenid variable in session
but its showing null point exception error while executing

i am using netbean so i guess i need to put this file under package..
i tried this also not working

can you please post detail structure for netbean or eclipse ide

<%-- Document : index Created on : Jun 7, 2011, 10:30:57 AM --%> <%@taglib uri="/struts-tags" prefix="s" %> <html> <head> <title>Index page </title> </head> <body> <%--redirect to login page --%> <%--<%response.sendRedirect("login.jsp");%>--%> <s:form action="hello" namespace="/"> <s:textfield name="username" label="username"/> <s:submit/> </s:form> </body> </html>
this is my main file.. and struts config file is

<?xml version="1.0" encoding="UTF-8"?> <struts> <constant name="struts.devMode" value="true" /> <package name= "default" namespace="/" extends="struts-default" > <action name="hello" class="/hello.test" > <result name="SUCCESS">success.jsp</result> </action> </package> </struts>


i am using netebean 7 and i am putting struts file under web-inf

i am new in struts 2. can you please help me out in setup struts2.0 framework in netbeans. i have 6.9 and 7.0 version of neatbeans

or any plugin for eclipse will also work 4 me

Henry Wong wrote:

vineet walia wrote:
why it is returning true.
in this obj is Object type. so obj reference type is object.if i will test this reference type with UsableVNO it should return false. but it is not returning

The instanceof operator is use to test whether an object is of a particular class type. It is *not* used to test whether the reference pointing to the object is a particular reference type... the later case can be done at compile time, and quite frankly, has very limited usefulness.

Henry

ok fine
so obj is object type of Object.
why it is returning true in instancsof operator.
what i think
obj instanceof UsableVNO should return false.
and vice-versa should return true
like:

Object (obj)
|
|
UsableVNO (uno)
uno instanceof Object-----.true
obj insyanceof UsableVNO---false

package com.my; class UsableVNO{ private int release; private int revision; private int patch; public UsableVNO(int release, int revision, int patch) { this.release=release; this.revision=revision; this.patch=patch; } // equal method override public boolean equal(Object obj) { if(obj==this) return true; System.out.println((obj instanceof UsableVNO)); if(!(obj instanceof UsableVNO)) return false; UsableVNO vno = (UsableVNO)obj; return vno.patch == this.patch && vno.revision== this.revision && vno.release== this.release; } // toString method override public String toString() { return("("+release+"."+revision+"."+patch+")"); } } public class testUsableVNO { public static void main(String str []) { // main method UsableVNO t1= new UsableVNO(1,0,2); UsableVNO t2= new UsableVNO(2,2,2); // System.out.println("testing case"); // System.out.println(t1==t2); // System.out.println("testing equal"); System.out.println(t1.equal(t2)); } }

i got confused in System.out.println((obj instanceof UsableVNO));
why it is returning true.
in this obj is Object type. so obj reference type is object.if i will test this reference type with UsableVNO it should return false. but it is not returning please explain why.

Object (obj)
^
|
|
UsableVNO

thanks a lot

interface f1 { int i=15; } interface f2 { int i =5; } public class inter implements f1,f2 { public static void main(String str []) { System.out.println("testing"+i);// i have to print f1 i variable } }


i have to print f1 interface variable