Satheesh Kumar

Hai
I have just now finished my Certificate Exam with 75%.
I am really thankful for all the officials, in their effort to answer each and every doubt raised in this site.
I declare it proudly that without JAVARANCH I really could not
have accomplished this Successfully.
Thanks a lot for all the participants too.
satheesh

Thanks bob for ur detail explanation
now I got it..,
satheesh

weigang and carl thanks for ur valuable infomation
Those explanation really helped me a lot
satheesh

Hello
Can somebody show light on these o/ps what is the
ultimate effect when a negative no is used in the
shift operations...?
System.out.println("7 >> -1 = "+ (7 >> -1));
System.out.println("7 << -1 = "+ (7 << -1));<br /> o/p is 7 >> -1 = 0 & 7 << -1 = -2147483648<br /> System.out.println("8 >> -1 = "+ (8 >> -1));
System.out.println("8 << -1 = "+ (8 << -1));<br /> o/p is 8 >> -1 = 0 & 8 << -1 = 0 <br /> System.out.println("2 >> -1 = "+ (2 >> -1));
System.out.println("2 << -1 = "+ (2 << -1));<br /> 0/p is 2 >> -1 = 0 & 2 << -1 = 0<br /> System.out.println("3 >> -1 = "+ (3 >> -1));
System.out.println("3 << -1 = "+ (3 << -1));
o/p is 3 >> -1 = 0 & 3 << -1 = -2147483648
Thanks in advance
satheesh

I reallly could not understand what is given in the book when I read it, could u pls explain to me in brief
Thanks in advance

Check out this example from "sandeep mock exam"
class MyClass
{
public static void main(String []args)
{
final int i = 100;
byte b = i;
System.out.println("i ="+b);
}
}
ans : o/p i =100
BUT
class MyClass
{
public static void main(String []args)
{
int i = 100;
byte b = i;......(1)
System.out.println(b);
}
}
I get a compiler error as Incompatible type declaration, so when I cast line (1) as byte b = (byte)i; it works fine with o/p 100
why is this strange behaviour with " final keyword"?, I am confused.
can somebody clear my doubt?
Thanks in advance
satheesh

Questions from khalid, I am not sure of the answere can somebody
explain to me
1.Given that a static method doIt() in a class Work represents work to be done, what block of code will succeed in starting a new thread that will do the work?
CODE BLOCK A:
Runnable r = new Runnable() {
public void run() {
Work.doIt();
}
};
Thread t = new Thread(r);
t.start();
CODE BLOCK B:
Thread t = new Thread() {
public void start() {
Work.doIt();
}
};
t.start();
CODE BLOCK C:
Runnable r = new Runnable() {
public void run() {
Work.doIt();
}
};
r.start();
CODE BLOCK D:
Thread t = new Thread(new Work());
t.start();
CODE BLOCK E:
Runnable t = new Runnable() {
public void run() {
Work.doIt();
}
};
t.run();
////
2.Which method implementations will write the given string to a file named "file", using UTF8 encoding?
IMPLEMENTATION A:
public void write(String msg) throws IOException {
FileWriter fw = new FileWriter(new File("file"));
fw.write(msg);
fw.close();
}
IMPLEMENTATION B:
public void write(String msg) throws IOException {
OutputStreamWriter osw =
new OutputStreamWriter(new FileOutputStream("file"), "UTF8");
osw.write(msg);
osw.close();
}
IMPLEMENTATION C:
public void write(String msg) throws IOException {
FileWriter fw = new FileWriter(new File("file"));
fw.setEncoding("UTF8");
fw.write(msg);
fw.close();
}
IMPLEMENTATION D:
public void write(String msg) throws IOException {
FilterWriter fw = FilterWriter(new FileWriter("file"), "UTF8");
fw.write(msg);
fw.close();
}
IMPLEMENTATION E:
public void write(String msg) throws IOException {
OutputStreamWriter osw = new OutputStreamWriter(
new OutputStream(new File("file")), "UTF8"
);
osw.write(msg);
osw.close();
}

Thanks Jane for ur explanation, now I understood the way it works
satheesh

public class Test {
public static void main(String args[]) {
StringBuffer a = new StringBuffer("One");
StringBuffer b = new StringBuffer("Two");
Test.swap(a,b);
System.out.println("a = "+ a +" & b = " + b);
}
static void swap (StringBuffer a, StringBuffer b) {
a.append(" more");
b=a;
}
}
///ans is " a = one more & b = two "
can somebody throw light on the strange behaviour of the
"append()"
I expected the answer to be " one and two " but why this res?
Thanks in advance
satheesh

Hi,
Here are some questions from ibm mock exam can somebody help me to find the answers
Thanks in advance
1. An applet is more restrictive than an application in the following ways: (2 choices)

a) An applet may not perform local disk I/O.
b) An applet may not connect with any server except the
server where the applet was loaded from
c) An applet can change the CODEBASE
d) An applet cannot call the update() method directly
2) ThreadGroup class instances: (2 choices)
a) Allow threads to be manipulated as a group
b) Provide support for ThreadDeath listeners
c) May contain other ThreadGroups
d) Must contain threads of the same type
3) Primitive type wrapper classes: (3 choices)
a) Allow primitive types to behave as reference types
b) Allow operator overloading to be implemented for
primitive numeric types
c) Provide string parsing and conversion methods
d) Provide arithmetic operators such as plus and minus
e) Are provided for all primitive types, including void

4) The following are true of Java character-oriented streams:
(2 choices).
a) They provide support for character conversion between
Unicode and ASCII
b) They all implement the CharacterStream Interface
c) They inherit from either the Reader or Writer abstract
classes
d) They are restricted to 2^16 (2 raised to power of 16) in
length
5) Which of the following method pairs are best used for controlling thread communication?
a) stop() and resume()
b) wait() and notify()
c) threadWait() and threadNotify()
d) run() and destroy()
6)if(a) {x=y;} else{x=z;} can otherwise be writtern as
a) a=x?x=y:x=z;
b) x=a?x=y:x=z;
c) x=a?y:z;
d) a=x?y:z;

Thanks Bill and Rajiv
I did not mean to confuse people, but my question was to get an answer for "is a" relation
If I had done so.., I am extremely sorry..,
Thanks for the explanation, now I am clear with the ans

Originally posted by Satheesh Kumar:
Hai
I found this question in "sun site " for "has a " relationship..,
now can anyody help me out in this question

Which two demonstrate a "is a" relationship?
a. public interface Person{ }
public class Employee extends Person{ }
b. public interface Shape{ }
public interface Rectangle extends Shape{ }
c. public interface Colorable{ }
public class Shape implements Colorable{ }
d. public class Species{ }
public class Animal{private Species species;}
e. interface Component{ }
class Container implements Component{
private Component[] children;
}

Hai
I found this question in "sun site " for "has a " relationship..,
now can anyody help me out in this question

Which two demonstrate a "is a" relationship?
a. public interface Person{ }
public class Employee extends Person{ }
b. public interface Shape{ }
public interface Rectangle extends Shape{ }
c. public interface Colorable{ }
public class Shape implements Colorable{ }
d. public class Species{ }
public class Animal{private Species species;}
e. interface Component{ }
class Container implements Component{
private Component[] children;
}

Sivram
All the other answers except d given by Aruna will be applicable even if "class C extends A "
d) z= (C)y;
// gives a Compiler error "Invalid Cast from B to C"
This is because any two Subclass (from a Single Parent) cannot communicate, We cannot "Cast" them.
I think now ur doubt is cleared
satheesh

Originally posted by Sivaram Ghorakavi:
Q20) Which statements, when inserted at the indicated position in the following code, will cause a runtime exception when attempting to run the program??
class A {}
class B extends A{}
class C extends C{}
public class Q3ae4
{
public static void main(String args[])
{
A x = new A();
B y = new B();
C z = new C();
// insert statment here
}
}
Select all valid answers.
a) x = y;
b) z = x;
c) y = (B)x;
d) z = (C)y;
e) y = (A)y;
BOL

Hi,
I am new to java , I have some basic doubts can somebody clear it for me..., I am studying java by my own that is I am streching my hand for help..., I found this site to be the apt place where people are ready to help me out.., ( I am sorry though I knew this is basic for u people who are preparing for programmer certification..,
1. How will u DEBUG java programs.., I meant line by line debuging as we do in c/c++..,(detailed pls..,).., this is to see the flow of the pgm, and the corresponding values in each line
2. how will u run this code in the
import java.awt.*;
public class Butt extends Frame{
public static void main(String argv[]){
Butt MyBut=new Butt();
}
Butt(){
Button HelloBut=new Button("Hello");
Button ByeBut=new Button("Bye");
add(HelloBut);
add(ByeBut);
setSize(300,300);
setVisible(true);
}
}
thanks in advance...,
can I expect an reply
satheesh