ushma agarwal

hello Himanshu,

well i need to use both in this project. jsp for view purpose and servlet for business logic. see so far i have designed html pages using MS FrontPage with validation�.actually this my first project so I need lots of guidance�

I will be grateful for your help.

thanks

Hello all,

I need to develop a project on Online examination system. I have installed netbeans 5.5 and oracle 10g. my problem is this I have no idea how to use netbeans, I read Netbeans help and NetBeans Tutorial for Web Applications but still things are not clear.please somebody tell me what all steps I need to take or some resource/website where I can find help.

Thank you all in advance

I was going through a DD there were few elements, which I don�t know, please explain their purpose.
1.<realm-name> under <login-config> like this

<login-config>
<auth-method> BASIC</auth-method>
<realm-name> LDAP REALM </reaml-name>
</login-config>

2.there are few related with EJB/JNDI configuration but I don�t know their purpose
<env-entry>
<env-entry-name></env-entry-name>
<env-entry-type></env-entry-type>
<env-entry-value></env-entry-value>
<env-entry>

<resource-env-ref>
<recource-env-ref-name>jms/stockQueue</resource-env-ref-name>
<resource-env-ref-type>javax.jms.Queue</resource-env-ref-type>
</resource-env-ref>

<resource-ref>
<res-ref-name>jdbc/EmpDB</res-ref-name>
<res-type>javax.sql.Datasource</res-type>
<res-auth>Container</res-auth>
<res-sharing-scope>Shareable</res-sharing-scope>
</rersource-ref>

3.this one in TLD <variable> and <dynamic-attributes> under <tag> element:

<tag>
<name>custom</name>
<tag-class>com.example.TagHandler</tag-class>
<body-content>empty</body-content>

<attribute>
<name>age></name>
<required>true</required>
<type>java.lang.String</type>
<rtexprvalue>true</rtexprvalue>
</attribute>

<variable>
<name-from-attribute>var</name-from-attribute>
<scope>AT_BEGIN</scope>
<variable>

<dynamic-attributes>true<dynamic-attributes>
</tag>

i want to thank javaranch. this forum helped me a lot in my preprations. you know i have suggested my friends to join this forum. good luck everybody.

Kelvin, please explain in detail why the following code is illegal:

class Foo { final Integer foo; Foo() { foo = 5; } Foo(String s) { } }

is it because we are not initializing final instance variable in the overloaded constructor?

And in the following code is it just because we are initializing final instance variable in a method and not within a constructor?
class Foo { final Integer foo; Foo() { initFoo(); } void initFoo() { foo = 5; } }

Thanks a lot Kelvin and nico for explaining it so nicely

please tell me why the output of the following code is T1T1T3.

class A implements Runnable { public void run() {System.out.print(Thread.currentThread().getName());} } class B implements Runnable { public void run() { new A().run(); new Thread(new A(),"T2").run(); new Thread(new A(),"T3").start(); }} class C { public static void main (String[] args) { new Thread(new B(),"T1").start(); }}

why not T1T2T3.

new Thread(new A(),"T2").run();
here we are creating a new thread "T2" and on this thread we are invoking run() method directly.

somebody please tell me what are correct options and why?

class A { private String name; private A otherA; public A(String name) {this.name = name;} public void other(A otherA) {this.otherA = otherA;} public A other() {return otherA;} public String toString() {return name;} protected void finalize() {System.out.print(name);} } class B { public static void m1() { A a1 = new A("A1"), a2 = new A("A2"), a3 = new A("A3"), a0 = a3; a1.other(a2); a2.other(a3); a3.other(a1); for(int i = 0; i<4; i++){System.out.print(a0 = a0.other());} } public static void main(String[] args) {m1(); System.gc();} } Which of the following could be a result of attempting to compile and run the program? a. A1A2A3A1 b. A0A0A0A0A1A2A3 c. A1A2A3A1A2A3 d. A1A2A3A1A1A2A3 e. A1A2A3A1A3A2A1 f. A0A1A2A3A1A2A3

thank you in advance!

thanks deepak
now i got the point.

somebody please tell me why //line 2 is giving compiler error?
class M { public static void main(String[] args) { int[] a1[],a2[]; // 1 int []a3,[]a4; // 2 int []a5,a6[]; // 3 int[] a7,a8[]; // 4 } }

programmer has written the following class to prevent garbage collection of the objects of this class. Is he mistaken?

class SelfReferencingClassToPreventGC { private SelfReferencingClassToPreventGC a; Object obj = new Vector(); public SelfReferencingClassToPreventGC() { a = this; //reference itself to make sure that this is not garbage collected. } public void finalize() { System.out.println("Object GCed"); } }

and the answer is TRUE.
but i m unable to underttand why its ture. somebody please explain how can we prevent garbage collection.

Hi nikunj,

thanks. i wish you good luck the exam.

hello all,
i am new in this forum. i got to know that javaranch is the best forum for those who are into java. well i need to clear SCJP in one month time that to with good grades ceriously.
i have one book THE COMPLETE REFERENCE JAVA 2 fifth edition --by H.Schildt
and
online documentation of SCJP SUN CERTIFIED PROGRAMMER FOR JAVA 5 SYUTD GUID (EXAM 310-055)--- by Katherine Sierra and Bert Bates
please tell what else i need and how i should proceed.
i am not in a position to buy any mock exam kit so kindly suggest some free links also.