Vidya Selvaraj

Refer to
http://www.javaranch.com/maha/
http://www.javaranch.com/maha/_Mock_Exams/_mock_exams.html
[This message has been edited by Vidya Selvaraj (edited December 09, 2000).]

It is the " Complete Java 2 Certification Study Guide" by
Simon Roberts
Philip Heller
Michael Ernest
[This message has been edited by Vidya Selvaraj (edited December 09, 2000).]

Milind, buttons are added to the panel(flow layout), then Panel is added to the frame. Hope this is clear
Thanx
Vidya

Amrit, This example was picked from Maha's Collection of Thread!. I added some more scenario's for my own clarification. Scenario 11 & 12 might be what you are looking for!
class PrintUpto5 { static synchronized void staticSyncPrint() { for(int i=0; i<5; i++) { System.out.println("i= "+ i + Thread.currentThread().getName()+" " + "Static Sync print "); } } synchronized void syncPrint() { for(int j=0; j<5; j++) { System.out.println("j= "+ j + Thread.currentThread().getName()+" " + "Sync print "); } } void nonSyncPrint() { for(int k=0; k<5; k++) { System.out.println("k= "+ k + Thread.currentThread().getName()+" " + "Non Sync print "); } } } class ThreadCalling_Sync_Method extends Thread { PrintUpto5 obj=null; ThreadCalling_Sync_Method() { super(); } ThreadCalling_Sync_Method(PrintUpto5 obj) { this.obj = obj; } public void run() { this.obj.syncPrint(); //Call the Synchronized Method } } class ThreadCalling_StaticSync_Method extends Thread { PrintUpto5 obj=null; ThreadCalling_StaticSync_Method() { super(); } ThreadCalling_StaticSync_Method(PrintUpto5 obj) { this.obj = obj; } public void run() { this.obj.staticSyncPrint();//Call the staticSynchronized Method } } class ThreadCalling_NonSync_Method extends Thread { PrintUpto5 obj=null; ThreadCalling_NonSync_Method() { super(); } ThreadCalling_NonSync_Method(PrintUpto5 obj) { this.obj = obj; } public void run() { this.obj.nonSyncPrint(); //Call the Non-Synchronized Method } } class ThreadExamples { public static void main(String[] args) throws Exception { //Create the 2 objects of SAME class which will be bumbarded //by the threads PrintUpto5 printObj = new PrintUpto5(); PrintUpto5 printObj1 = new PrintUpto5(); PrintUpto5 printObj2 = new PrintUpto5(); //Scenario 1 ThreadCalling_Sync_Method t1 = new ThreadCalling_Sync_Method (printObj); ThreadCalling_Sync_Method t2 = new ThreadCalling_Sync_Method (printObj); ThreadCalling_Sync_Method t3 = new ThreadCalling_Sync_Method (printObj); t1.start(); t2.start(); t3.start(); /*-- output Scenario 1------- j= 0Thread-0 Sync print j= 1Thread-0 Sync print j= 2Thread-0 Sync print j= 3Thread-0 Sync print j= 4Thread-0 Sync print j= 0Thread-2 Sync print j= 1Thread-2 Sync print j= 2Thread-2 Sync print j= 3Thread-2 Sync print j= 4Thread-2 Sync print j= 0Thread-1 Sync print j= 1Thread-1 Sync print j= 2Thread-1 Sync print j= 3Thread-1 Sync print j= 4Thread-1 Sync print ------------------------------*/ //Scenario 2 /*ThreadCalling_Sync_Method t1 = new ThreadCalling_Sync_Method (printObj); ThreadCalling_Sync_Method t2 = new ThreadCalling_Sync_Method (printObj1); ThreadCalling_Sync_Method t3 = new ThreadCalling_Sync_Method (printObj2); t1.start(); t2.start(); t3.start();*/ /*-- output Scenario 2------- j= 0Thread-0 Sync print j= 1Thread-0 Sync print j= 0Thread-1 Sync print j= 2Thread-0 Sync print j= 0Thread-2 Sync print j= 1Thread-1 Sync print j= 3Thread-0 Sync print j= 1Thread-2 Sync print j= 2Thread-1 Sync print j= 4Thread-0 Sync print j= 2Thread-2 Sync print j= 3Thread-1 Sync print j= 3Thread-2 Sync print j= 4Thread-1 Sync print j= 4Thread-2 Sync print ------------------------------*/ //Scenario 3 /*ThreadCalling_StaticSync_Method t1 = new ThreadCalling_StaticSync_Method (printObj); ThreadCalling_StaticSync_Method t2 = new ThreadCalling_StaticSync_Method (printObj); ThreadCalling_StaticSync_Method t3 = new ThreadCalling_StaticSync_Method (printObj); t1.start(); t2.start(); t3.start();*/ /*-- output Scenario 3------- i= 0Thread-0 Static Sync print i= 1Thread-0 Static Sync print i= 2Thread-0 Static Sync print i= 3Thread-0 Static Sync print i= 4Thread-0 Static Sync print i= 0Thread-1 Static Sync print i= 1Thread-1 Static Sync print i= 2Thread-1 Static Sync print i= 3Thread-1 Static Sync print i= 4Thread-1 Static Sync print i= 0Thread-2 Static Sync print i= 1Thread-2 Static Sync print i= 2Thread-2 Static Sync print i= 3Thread-2 Static Sync print i= 4Thread-2 Static Sync print ------------------------------*/ //Scenario 4 /*ThreadCalling_StaticSync_Method t1 = new ThreadCalling_StaticSync_Method (printObj); ThreadCalling_StaticSync_Method t2 = new ThreadCalling_StaticSync_Method (printObj1); ThreadCalling_StaticSync_Method t3 = new ThreadCalling_StaticSync_Method (printObj2); t1.start(); t2.start(); t3.start();*/ /*-- output Scenario 4------- i= 0Thread-0 Static Sync print i= 1Thread-0 Static Sync print i= 2Thread-0 Static Sync print i= 3Thread-0 Static Sync print i= 4Thread-0 Static Sync print i= 0Thread-1 Static Sync print i= 1Thread-1 Static Sync print i= 2Thread-1 Static Sync print i= 3Thread-1 Static Sync print i= 4Thread-1 Static Sync print i= 0Thread-2 Static Sync print i= 1Thread-2 Static Sync print i= 2Thread-2 Static Sync print i= 3Thread-2 Static Sync print i= 4Thread-2 Static Sync print ------------------------------*/ //Scenario 5 /*ThreadCalling_NonSync_Method t1 = new ThreadCalling_NonSync_Method (printObj); ThreadCalling_NonSync_Method t2 = new ThreadCalling_NonSync_Method (printObj); ThreadCalling_NonSync_Method t3 = new ThreadCalling_NonSync_Method (printObj); t1.start(); t2.start(); t3.start();*/ /*-- output Scenario 5------- k= 0Thread-0 Non Sync print k= 1Thread-0 Non Sync print k= 0Thread-1 Non Sync print k= 0Thread-2 Non Sync print k= 2Thread-0 Non Sync print k= 1Thread-1 Non Sync print k= 1Thread-2 Non Sync print k= 3Thread-0 Non Sync print k= 2Thread-1 Non Sync print k= 2Thread-2 Non Sync print k= 4Thread-0 Non Sync print k= 3Thread-1 Non Sync print k= 3Thread-2 Non Sync print k= 4Thread-1 Non Sync print k= 4Thread-2 Non Sync print ------------------------------*/ //Scenario 6 /*ThreadCalling_NonSync_Method t1 = new ThreadCalling_NonSync_Method (printObj); ThreadCalling_NonSync_Method t2 = new ThreadCalling_NonSync_Method (printObj1); ThreadCalling_NonSync_Method t3 = new ThreadCalling_NonSync_Method (printObj2); t1.start(); t2.start(); t3.start();*/ /*-- output Scenario 6------- k= 0Thread-0 Non Sync print k= 1Thread-0 Non Sync print k= 0Thread-1 Non Sync print k= 0Thread-2 Non Sync print k= 2Thread-0 Non Sync print k= 1Thread-1 Non Sync print k= 1Thread-2 Non Sync print k= 3Thread-0 Non Sync print k= 2Thread-1 Non Sync print k= 2Thread-2 Non Sync print k= 4Thread-0 Non Sync print k= 3Thread-1 Non Sync print k= 3Thread-2 Non Sync print k= 4Thread-1 Non Sync print k= 4Thread-2 Non Sync print ------------------------------*/ //Scenario 7 /*ThreadCalling_NonSync_Method t1 = new ThreadCalling_NonSync_Method(printObj); ThreadCalling_Sync_Method t2 = new ThreadCalling_Sync_Method(printObj); ThreadCalling_StaticSync_Method t3 = new ThreadCalling_StaticSync_Method(printObj); t1.start(); t2.start(); t3.start();*/ /*-- output Scenario 7 ------ k= 0Thread-0 Non Sync print k= 1Thread-0 Non Sync print j= 0Thread-1 Sync print i= 0Thread-2 Static Sync print k= 2Thread-0 Non Sync print j= 1Thread-1 Sync print i= 1Thread-2 Static Sync print k= 3Thread-0 Non Sync print j= 2Thread-1 Sync print i= 2Thread-2 Static Sync print k= 4Thread-0 Non Sync print j= 3Thread-1 Sync print i= 3Thread-2 Static Sync print j= 4Thread-1 Sync print i= 4Thread-2 Static Sync print ------------------------------*/ //Scenario 8 /*ThreadCalling_NonSync_Method t1 = new ThreadCalling_NonSync_Method(printObj); ThreadCalling_Sync_Method t2 = new ThreadCalling_Sync_Method(printObj1); ThreadCalling_StaticSync_Method t3 = new ThreadCalling_StaticSync_Method(printObj2); t1.start(); t2.start(); t3.start();*/ /*-- output Scenario 8 ------ k= 0Thread-0 Non Sync print k= 1Thread-0 Non Sync print j= 0Thread-1 Sync print k= 2Thread-0 Non Sync print j= 1Thread-1 Sync print i= 0Thread-2 Static Sync print k= 3Thread-0 Non Sync print j= 2Thread-1 Sync print i= 1Thread-2 Static Sync print k= 4Thread-0 Non Sync print j= 3Thread-1 Sync print i= 2Thread-2 Static Sync print j= 4Thread-1 Sync print i= 3Thread-2 Static Sync print i= 4Thread-2 Static Sync print ------------------------------*/ //Scenario 9 /*ThreadCalling_NonSync_Method t1 = new ThreadCalling_NonSync_Method(printObj); ThreadCalling_Sync_Method t2 = new ThreadCalling_Sync_Method(printObj); ThreadCalling_StaticSync_Method t3 = new ThreadCalling_StaticSync_Method(printObj); t3.start(); t2.start(); t1.start();*/ /*-- output Scenario 9 ------ i= 0Thread-2 Static Sync print i= 1Thread-2 Static Sync print i= 2Thread-2 Static Sync print j= 0Thread-1 Sync print k= 0Thread-0 Non Sync print i= 3Thread-2 Static Sync print j= 1Thread-1 Sync print k= 1Thread-0 Non Sync print i= 4Thread-2 Static Sync print j= 2Thread-1 Sync print k= 2Thread-0 Non Sync print j= 3Thread-1 Sync print k= 3Thread-0 Non Sync print j= 4Thread-1 Sync print k= 4Thread-0 Non Sync print ------------------------------*/ //Scenario 10 /*ThreadCalling_NonSync_Method t1 = new ThreadCalling_NonSync_Method(printObj); ThreadCalling_Sync_Method t2 = new ThreadCalling_Sync_Method(printObj1); ThreadCalling_StaticSync_Method t3 = new ThreadCalling_StaticSync_Method(printObj2); t3.start(); t2.start(); t1.start();*/ /*-- output Scenario 10 ------ i= 0Thread-2 Static Sync print i= 1Thread-2 Static Sync print k= 0Thread-0 Non Sync print i= 2Thread-2 Static Sync print k= 1Thread-0 Non Sync print j= 0Thread-1 Sync print i= 3Thread-2 Static Sync print k= 2Thread-0 Non Sync print j= 1Thread-1 Sync print i= 4Thread-2 Static Sync print k= 3Thread-0 Non Sync print j= 2Thread-1 Sync print k= 4Thread-0 Non Sync print j= 3Thread-1 Sync print j= 4Thread-1 Sync print ------------------------------*/ //Scenario 11 /*ThreadCalling_NonSync_Method t1 = new ThreadCalling_NonSync_Method(printObj); ThreadCalling_StaticSync_Method t2 = new ThreadCalling_StaticSync_Method(printObj); ThreadCalling_Sync_Method t3 = new ThreadCalling_Sync_Method(printObj); ThreadCalling_StaticSync_Method t4 = new ThreadCalling_StaticSync_Method(printObj); ThreadCalling_Sync_Method t5 = new ThreadCalling_Sync_Method(printObj); t3.start(); t1.start(); t5.start(); t2.start(); t4.start();*/ /*-- output Scenario 11 ------ j= 0Thread-2 Sync print j= 1Thread-2 Sync print k= 0Thread-0 Non Sync print i= 0Thread-1 Static Sync print j= 2Thread-2 Sync print k= 1Thread-0 Non Sync print i= 1Thread-1 Static Sync print j= 3Thread-2 Sync print k= 2Thread-0 Non Sync print i= 2Thread-1 Static Sync print j= 4Thread-2 Sync print k= 3Thread-0 Non Sync print i= 3Thread-1 Static Sync print j= 0Thread-4 Sync print k= 4Thread-0 Non Sync print i= 4Thread-1 Static Sync print j= 1Thread-4 Sync print i= 0Thread-3 Static Sync print j= 2Thread-4 Sync print i= 1Thread-3 Static Sync print j= 3Thread-4 Sync print i= 2Thread-3 Static Sync print j= 4Thread-4 Sync print i= 3Thread-3 Static Sync print i= 4Thread-3 Static Sync print ------------------------------*/ //Scenario 12 /*PrintUpto5 printObj3 = new PrintUpto5(); PrintUpto5 printObj4 = new PrintUpto5(); ThreadCalling_NonSync_Method t1 = new ThreadCalling_NonSync_Method(printObj); ThreadCalling_StaticSync_Method t2 = new ThreadCalling_StaticSync_Method(printObj1); ThreadCalling_Sync_Method t3 = new ThreadCalling_Sync_Method(printObj2); ThreadCalling_StaticSync_Method t4 = new ThreadCalling_StaticSync_Method(printObj3); ThreadCalling_Sync_Method t5 = new ThreadCalling_Sync_Method(printObj4); t3.start(); t1.start(); t5.start(); t2.start(); t4.start();*/ /*-- output Scenario 12 ------ j= 0Thread-2 Sync print j= 1Thread-2 Sync print k= 0Thread-0 Non Sync print j= 0Thread-4 Sync print i= 0Thread-1 Static Sync print j= 2Thread-2 Sync print k= 1Thread-0 Non Sync print j= 1Thread-4 Sync print i= 1Thread-1 Static Sync print j= 3Thread-2 Sync print k= 2Thread-0 Non Sync print j= 2Thread-4 Sync print i= 2Thread-1 Static Sync print j= 4Thread-2 Sync print k= 3Thread-0 Non Sync print j= 3Thread-4 Sync print i= 3Thread-1 Static Sync print k= 4Thread-0 Non Sync print j= 4Thread-4 Sync print i= 4Thread-1 Static Sync print i= 0Thread-3 Static Sync print i= 1Thread-3 Static Sync print i= 2Thread-3 Static Sync print i= 3Thread-3 Static Sync print i= 4Thread-3 Static Sync print ------------------------------*/ } }
Correct me if this is wrong!
Thanx
Vidya
[This message has been edited by Vidya Selvaraj (edited December 06, 2000).]

Refer
http://www.javaranch.com/ubb/Forum24/HTML/005125.html
Vidya

Jason,
Refer to this!
http://suned.sun.com/USA/certification/progdetails.html
& the passing score is 61%
All the best
Vidya

Hi Srinivasan,
Ok I am assuming that you are referring to K = 0 after i = new int[10];
After the line i = new int[10], the value of K is 6. if you remove k =0, The i[K] in
for(int j = 1000; j < 1010; j++)
{
i[k] = j;
k++; //Line in question.
}
will start with i[6], the for loop is performed 9 times, which will cause k value or i[k] go upto i[14]. Here is the problem. i is defined only as i[10], hope you got the point now!
Thanx
Vidya
[This message has been edited by Vidya Selvaraj (edited December 04, 2000).]

I do not get any exception if I remove k++; It compiles fine & the o/p is 1000 to 1005, 1009, & 9 zeroes

Here's the link!
http://www.javaranch.com/maha

Answer to your first question:
http://www.javaranch.com/ubb/Forum24/HTML/001464.html
[This message has been edited by Vidya Selvaraj (edited December 03, 2000).]

Hi Dipali,
I am not sure whether you are asking about -N >>> S or -N >> S. -N >> S has a clear explanation given by Santhosh & Rajani.
-N >>> S : The calculation can be done this way : ((2 ^ 32) - 1 )/(2 (s % 32)) Step by Step: ------------- Eg: -5 >>> 2 Numerator: 2 ^ 32 = 4294967296 (2 ^ 32) - 1 = 4294967296 - 1 = 4294967295 Denominator: s % 32 = 2 % 2 = 2 2 ^ (s % 32) = 2 ^ 2 = 2 * 2 = 4 Numerator/Denominator = 4294967295 / 4 = 1073741923 is your answer
Remember if S = 32 or 64 for int or long,
whatever you do for +/- N >>, <<, >>> S, the shift will not be performed, For eg: -5 >>> 32 = -5; -6 << 32 = -6; 6 >> 32 = 6

Thanx Amond, now its perfectly clear
- Vidya
[This message has been edited by Vidya Selvaraj (edited December 02, 2000).]

" can't shift further than the number of bits in the left-hand argument (int or long). Only the five (six) low-order bits of the right-hand argument will be used to shift an int (long) "
Can someone explain this clearly??
Thanx
Vidya

With SuperClass sup = new SuperClass();, O/P is
C:\jdk1.3\bin>java SuperClass
Super Constructor
SuperClass
super class a method
SuperClass
With SuperClass sup = new SubClass();, O/P is
C:\jdk1.3\bin>java SuperClass
Super Constructor
SubClass
super class a method
SubClass
Subclass amethod
SubClass
Subclass Constructor
SubClass

I modified the code a little bit for clear understanding:
class SuperClass {
public SuperClass(){
System.out.println("Super Constructor");
System.out.println(getClass().getName());
amethod();
}
public void amethod() {
System.out.println("super class a method");
System.out.println(getClass().getName());
}
public static void main(String[] args) {
SubClass sub = new SubClass();
}
}
class SubClass extends SuperClass {
public SubClass() {
System.out.println("Subclass Constructor");
System.out.println(getClass().getName());
}
public void amethod() {
super.amethod();
System.out.println("Subclass amethod");
System.out.println(super.getClass().getName());
}
}
/* Ouptut is:
C:\jdk1.3\bin>java SuperClass
Super Constructor
SubClass
super class a method
SubClass
Subclass amethod
SubClass
Subclass Constructor
SubClass
*/
Thanx
Vidya
Correct answer is "C"