I created this silly program to play with wait() public class WaitTest { public static void main(String [] args) { System.out.print("1 "); synchronized(args){ System.out.print("2 "); try { args.wait(); args.notifyAll(); } catch(InterruptedException e){ System.out.pri...
Hi! Question from SCJP test: class A{ A aob; public static void main(String args[]){ A a=new A(); A b=new A(); A c=new A(); a.aob=b; b.aob=a; c.aob=a.aob; A d=new A().aob=new A(); c=b; c.aob=null; System.gc(); ...
While studying for the SCJP 6 exam, I ran into this question in a test exam: class A{ private static String staticProperty = " a "; String getStaticProperty() { return staticProperty; } } class B extends A { private static String staticProperty = " b "; public static void main(String[] args){ new ...
For SCJP most of the time question such as below is asked to find valid example of polymorphic method calls. But what should one exactly look for to find is it polymorphic use or not ? abstract class A { abstract void a1(); void a2() { } } class B extends A { void a1() { } void a2() { } } class C extends B { void ...
Hi All, Just want to know whether SUN is providing any goodies (either free or paid), which can be availed for SCJPs ?? I heard like Microsoft is providing such goodies. Anybody has any idea on this? Cheers, PK ...
The objectives and sections are listed here: http://www.sun.com/training/catalog/courses/CX-310-065.xml I've been using the Sun Certified Programmer for Java 6 Study Guide, which lists objectives as well that are close to those on the Web site, but they also have "sub-objectives" in the book that appear to be somewhat manufactured. Wil...
Does anybody has any experience with Sun training? I wonder if the extra $1000 is justified if I sign up for the classroom training vs. the web-based or cd-rom one? Any advantages / disadvantages for both trainings? -Goe ...
I want to take the SCJP. But now Oracle has taken over Sun. So is SCJP stopped? Or it is continuing? ...
I'm practising for the SCJP exam using cram notes from the internet. According to my notes the ">>" operator is supposed to be signed right shift, with the sign bit being brought in from the left. While the left shift operator "<<" is supposed to preserve the sign bit. Playing around however, I'm able to shift the sign with the "<<" o...
Why does the following program throw an exception? public class MainClass{ public static void main(String[] argv){ callMethod(2); } public static void callMethod(Integer... i){ System.out.println("Wrapper"); } public static void callMethod(int... i){ System.out.println("Primitive"); } } The method cal...
It's actually from SCJP 6 StudyGuide Exam310-065(MGH,2008) The call to super() in Kinder class constructor seems to be redundant because of: quote from the book: i.e. that there is no need to type super() explicitly, as this can be done by compiler the compiler accepts very well version without call to super() The question i...
I know that we cant use assignment operator in if statements in java as we use in any other few languages. that is int a; if(a = 1) { } will give a compilation error. but the following code works fine, how? boolean b; if(b = true) { } EDIT : Is this the exception to rule that a...
Take a look at this code: public class Test { public static void main(String... args) { flipFlop("hello", new Integer(4), 2004); // flipFlop("hello", 10, 2004); // this works! } private static void flipFlop(String str, int i, Integer iRef) { System.out.println(str + " (String, int, Integer)"); } private static void flipFlo...
Is this the right time to go for a scjp certification?With Oracle being the authority won't SCJP lose its value as and when OCJP gets announced instead of the former? my worry is will one be able to go for the next level like SCWCD, once the change is brought about by oracle? ...
I'm currently preparing for the SCJP, which I plan to take in 6 months time. I was wondering weather you could give me any Java Project Ideas which ONLY involves Java (NOT JEE), which includes manipulating Object or includes certain concepts which'd appear in the SCJP Exam, to further strengthen my understanding of basic Java. Better be...
My question is about line (edit: 19), where the new PrintWriter is created with the constructor taking the FileWriter fw as a parameter. I don't understand the use of chaining the BufferedWriter bw to FileWriter if it isn't used later on in the actual writing. Can Java apply chaining in a way that bw still somehow affects the rest of the...
I want to take an SCJP exam, but I am unable to decide which one should I take - SCJP 5(Java 1.5) or SCJP 6(Java 1.6). It would be great if anyone could help me in this regard. Thanks, Rakesh. ...
While preparing for the SCJP-6 exam I faced with a difficult issue. I can’t find answer by myself. Please, answer for the question and give short comments: abstract class A<K extends Number> { // insert code here } public abstract <K> A<? extends Number> useMe(A<? super K> k); public abstract <K> A<? super Number> useMe(A<? ex...
I'm preparing the SCJP exam with the almost official study book ("SCJP Sun Certified Programmer for Java 6 Exam 310-065") I understand that Java programming is writting code that fulfills a certain high-level contract; So that Java can stay platform-independent. However, I have trouble understanding and remembering things when it comes...
I am passing the SCJP 6 exam in a month. I have the "SCJP Sun Certified Programmer for Java 6 Exam 310-065" book. It seems great for the exam. But I want your advice on this. Getting the closest possible to 100% would be great. I have found a site that answered some of the questions you ask yourself when you go trough the book. Here is ...