Rohan Kayan

How to read a '\n; new line character from Sybase DB ? In the table we have some string "\Device\newpath" while reading it using plain prepare statement on the output it is showing "\Deviceewpath" . Is there any way by which we can get the output "\Device\newpath" ?


TIA

Hi,
I was bit curious that , can we unload any Java class explicitly from Memory ?



Thanks in advance.

Hi,

I am bit confused regarding the Garbage Collection of object instance which reference is hold by some static member. When will that object be collected by GC ?


Thanks in advance.

Thanks to Javaranch forum for all the support during preparation.

Only object pointed by a1 is eligible to GC.


a2.b1 -> b1
a2.b2 ->b2

In Javadocs , I read this line for getInteger() method , "Determines the integer value of the system property with the specified name. " Which makes it clear that if there is no property with the name as "9" it will return null.

Oh got that , I thought second Qs is asking "Q2.How can a thread own the lock of this object? , that is why I thought it should provide more information about the Synchronization block. But now I am clear.


Thanks

Q1.A java class can be:

1 strictfp and final
2 abstract and final
3 public and abstract
4 protected
5 private




Q2.How can a thread own the lock of an object?

1 When the thread executes a synchronized instance method of that object
2 When the thread executes a synchronized statement block
3 When the thread calls wait() on this object


I wanted to ask , when the Question 1 refers to Java class , do we need to consider inner class too ?
In Question 2 - option 2 don't provide the complete information , so is that a correct ans or not ?

Following is the question from http://www.javacertifications.net
public class Test extends Thread{ static String sName = "good"; public static void main(String argv[]){ Test t = new Test(); t.nameTest(sName); System.out.println(sName); } public void nameTest(String sName){ sName = sName + " idea "; start(); } public void run(){ for(int i=0;i < 4; i++){ sName = sName + " " + i; } } }


options
A)good
B)good idea
C)good idea good idea
D)good 0 good 0 1

Correct answer is : A




My doubt is that , as the time/sequence of execution of threads are dependent of the actual JVM and platform , the ans for above question could be any of these five

1. good
2. good 0
3. good 0 1
4. good 0 1 2
5. good 0 1 2 3


Am I correct in my interpretation ??

# class Test2<String> { # java.lang.String my = "Hello!"; # }

If I am not wrong. the generic type "String" is creating confusion , we generally use <T> or some other character for generic types , in above code we are using "String" to represent generic type.

Neha , what do you mean by "most closely associated class" ???

Hi, I am trying to run following code from Eclipse

public static void main(String[] args) { Console console = System.console(); String name = console.readLine("%s", "input?: "); }

Every time I am getting NullPointerException , what could be the issue ??

I think this one is a better example to understand that Interfaces are compiled as .class files and every classes are itself an Object in Java , that is why Interfaces "IS-A" java.lang.Object

It is still not clear to me ,

java.io.Serializable sb = new String(); Object o = sb;

In above example String "is-a" an Object that is why the assignment in second line worked. But how can we say that Interface "IS-A" java.lang.Object ?

Integer i = 5000; Integer j = 5000; System.out.println(i==j); Integer k = 120; Integer l = 120; System.out.println(k==l);

Why I am getting the output as , false and true ??