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SCJP question 2

priyaguptan — Tue, 21 Oct 2008 09:13:20 -0500

Given:

public class Test{
public enum Dogs{collie,harrier,shepherd};
public static void main(String [] args){
Dogs myDog=Dogs.shepherd;
switch(myDog)
{
case collie:
System.out.print("collie");
case default:
System.out.print("retreiver");
case harrier:
System.out.print("harrier");
}
}
}

what would be the output of this program? Would it print retreiver harrier or would it give a compilation error?

SCJP practice question

priyaguptan — Tue, 21 Oct 2008 07:08:52 -0500

I have the following code:

public interface A{
public void doSomething(String string);
}
public class AImpl implements A{
public void doSomething(String msg){}
}
public class B{
public A doit(){
//some code
}
public String execute()
{
//more code
}
}
public class C extends B{
public AImpl doit(){
//more code
}
public Object execute()
{
//more code
}
}

Why does class C not compile here?

Clarification in Jsp

priyaguptan — Fri, 05 Sep 2008 06:22:46 -0500

I have a jsp file say a.jsp . When i click on a button on this jsp file it pops up another jsp say b.jsp which has a textbox and a save button. Now when i enter some details in the text box and click on save , i want the info from the text box in b.jsp to be passed on to a.jsp and then the form in a.jsp needs to be submitted for further action. Kindly let me know how this can be done if possible with an example.

Get context path using JSTL

reena — Sun, 24 Aug 2008 01:38:56 -0500

How can I access the context path using JSTL. I need the equivalant of

<%= application.getContextPath() %> using JSTL

java.lang.RuntimeException: Error parsing XPath '/sqlMapConfig/sqlMap'. with IBATIS

sanjay — Sun, 24 Aug 2008 00:01:17 -0500

I am getting a runtime error message with my IBATIS code.

java.lang.RuntimeException: Error occurred. Cause: com.ibatis.common.xml.NodeletException: Error parsing XML. Cause: java.lang.RuntimeException: Error parsing XPath '/sqlMapConfig/sqlMap'. Cause: com.ibatis.common.xml.NodeletException: Error parsing XML. Cause: java.lang.RuntimeException: Error parsing XPath '/sqlMap/select'. Cause: com.ibatis.sqlmap.client.SqlMapException: Error. Could not set result class. Cause: java.lang.ClassNotFoundException: TestResult
at com.ibatis.sqlmap.engine.builder.xml.SqlMapConfigParser.parse(SqlMapConfigParser.java:89)
at com.ibatis.sqlmap.client.SqlMapClientBuilder.buildSqlMapClient(SqlMapClientBuilder.java:63)
at org.apache.jsp.test_jsp._jspService(test_jsp.java from :79)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:93)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:831)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:373)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:470)

How do I fix this issue?

JSTL String comparison

reena — Sat, 23 Aug 2008 10:08:09 -0500

How can I compare two strings using JSTL?

Checking variable existance using JSTL

reena — Sat, 23 Aug 2008 08:34:44 -0500

How can I check a variable's existance using JSTL? I am expecting an attribute in my session and if that attribute exist I need to display a block of code. How can I do that?

Reading session attributes using JSTL

reena — Sat, 23 Aug 2008 08:28:08 -0500

How can I read a session attribute using JSTL?

JSPG0124E: Custom tag attribute test cannot be runtime expression

reena — Tue, 19 Aug 2008 10:27:02 -0500

I am getting an error message with my JSTL code. The stack trace is

HTTP Error Code: 500

Error Message:JSPG0227E: Exception caught while translating /registration.jsp: /registration.jsp(192,85) --> JSPG0124E: Custom tag attribute value cannot be runtime expression. value: "[${param.txtFirstName}]"

Root Cause:com.ibm.ws.jsp.translator.JspTranslationException: JSPG0227E: Exception caught while translating /registration.jsp: /registration.jsp(192,85) --> JSPG0124E: Custom tag attribute value cannot be runtime expression. value: "[${param.txtFirstName}]" at com.ibm.ws.jsp.translator.visitor.validator.ValidateVisitor.validateCustomTagAttributeValues(ValidateVisitor.java:1442) at com.ibm.ws.jsp.translator.visitor.validator.ValidateVisitor.visitCustomTagStart(ValidateVisitor.java:277) at com.ibm.ws.jsp.translator.visitor.JspVisitor.processJspElement(JspVisitor.java:253) at com.ibm.ws.jsp.translator.visitor.JspVisitor.processChildren(JspVisitor.java:286) at

Whats wrong?

NetBeans IDE 6.5 Beta Now Available

albinjoseph — Mon, 18 Aug 2008 06:21:18 -0500

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NetBeans IDE 6.5 Beta also includes all the great features introduced in NetBeans 6.1 like the powerful and intuitive JavaScript Editor, support for Spring Framework, ClearCase (via Update Center), and RESTful Web Services.

Read the complete release information here. http://www.netbeans.org/community/releas...index.html

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Delete the last character from a string

moonlight — Mon, 18 Aug 2008 06:08:08 -0500

How do I remove the last character from a string? Assume that I have a String named str

str="Hello World";

I want to remove the last 'd' from str.

Java 6 documentation

moonlight — Mon, 18 Aug 2008 06:04:36 -0500

Where can I download the documentation for Java 1.6?

Exception Handling

abhinav — Wed, 13 Aug 2008 03:20:25 -0500

Hi Everyone...

I am confused with one example of try..catch..finally..
so plz help me out in getting it correctly

class Test_Exception
{
static void test() throws IOException
{
try
{
throw new IOException();
}
finally
{
System.out.println("In Finally");///line 1
}
}
public static void main(String []arg)
{
try
{
test();
}catch(Exception e)
{
System.out.println("In Catch");
}
System.out.println("End Main");
}
}

the output is
In Finally
In Catch
End Main

why after finally this catch block executed??

and if line is replaced by catch block like this
catch(IOException ioe)
{
System.out.println("In Catch_test");
}
then what o/p is different now??
Thanks in Advance.

DevWeek India 2008- No Marketing Bushwah, Only Real Information

ashwini — Fri, 01 Aug 2008 06:22:09 -0500

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DevWeek India 2008 gives you a rare chance to meet your peers in a productive and social environment and get passionate about Software programming. By the end of DevWeek India 2008, you will learn how to increase your productivity dramatically and save cost, and how to enhance the quality of your software applications.

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How to convert a String to date

moonlight — Thu, 10 Jul 2008 04:55:14 -0500

How do I convert a String to date?

inner class in an interface

priyaguptan — Tue, 01 Jul 2008 02:29:30 -0500

Is it possible to have a class within an interface?

If it is possible , then is it possible to create an object of that class?

Map object

priyaguptan — Thu, 26 Jun 2008 22:13:24 -0500

I learnt that Map is an interface that maps unique keys to values. A key is an object that we use to retrieve a value at a later date. Give a key and a value, we can store the value in a Map object..Now my confusion is if Map is an Interface how come it can be instantiated i.e.,how can we have Map as an object. Kindly clarify me.

Collections and Map interface

priyaguptan — Thu, 26 Jun 2008 22:07:16 -0500

What are Collections and what is a Map interface? Can u pls explain with an example.

Clarification with interfaces.

priyaguptan — Wed, 25 Jun 2008 05:27:26 -0500

Hi,

Suppose i have a prog like this:

interface Content
{
int i=9;
void publish();
}
class Article implements Content
{
void publish(){
/*Some code*/
}
}
class Blogs implements Content
{
void publish()
{
/* Some code*/
}
.
.
.
.
.
.
.

now if there are n number of classes which implement the interface Content and among these classes i want the implementation of publish() method only in n/2 number of classes then it is not possible to declare all the rest of the n/2 classes as abstract as the number of classes is huge but at the same time i want to make use of 'i' also...what is the solution for this?

Store multiple objects in a single array

priyaguptan — Wed, 25 Jun 2008 03:13:44 -0500

Pls let me know how I can store multiple objects in a single array. If possible kindly give me a code snippet to show how it is done.