m Sabale

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since Mar 22, 2005
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Recent posts by m Sabale

the answer should be 4.
since class A is Public, JVM will implicitly assign public access modifier to constructor of A.
class maybe{
public static void main(String []args)
{boolean b1=true;
boolean b2=false;
System.out.print(!false ^ false);
System.out.print(" " + (!b1 & (b2=true)));
System.out.println(" " + (b2 ^ b1));
}}

doubt::: in the 3rd println how can the output be false?in fact what the ^ operator does is check for only one true in the expression and it gets it from the b1 variable...?

question 2::::also im still not at clear with the & and | operators.


& and | always executes both conditions whatever is the output of 1st conditions. In & operation, eventhough 1st condition is false it 'll execute 2nd condition and in | operation, eventhough 1st condition is true it 'll execute 2nd condition. Exactly opposite is in Short-circuit &&, ||.

in 2nd print true is assigned to b2 =>> (!b1 & (b2=true))
so in 3rd println b1 and b2 both are true so true ^ true output is false


question 3:::could you please explain me the following code

class titanic{
public static void main(String []args){
Boolean b1=true;
Boolean b2=false;
Boolean b3=true;
if((b1 & b2) | (b2 & b3) & b3)
System.out.println("alpha");
if((b1=false) | (b1 & b3) | (b1 | b2))
System.out.println("beta");
}}
the output comes out to be nothing at all. please explain it step by step?

in 1st if condition
(b1 & b2) = false (b2 & b3) = false
so if( false | false & true) gives you false and so it 'll nt print "alpha"


in 2nd if condition
it assigns false to b1 so now b1 = false
(b1 & b3) = true
(b1 | b2) = false | false = false (since b1=false)
so final condition is if( false | true & false) gives false and it doesn't print "beta"

So no output for 2nd example
please go thru tutorials for if condition and how if handles boolean values.
for Eg:
boolean b = true;
if(b=false).... here it assigns false value to be..
but same is not true for int values like :
int b=0;
if(b=1)... compiler will gv error for this since it expects boolean value...
Hi Chandra,

I have gone thru assertion test. But I need some clarification and corrections::
Q 1) a,b should be static to use in static methods evaluateFirst(),evaluateSecond()
Q 7) how answer is C also?
Q 9) answer A,C are confusing. A says assert has been used inappropriately at Line 1 and C says assert has been used legally??
Q 10)answer A,D are confusing again. A says it's inappropriate use of assert in doStuff() and C says legal use of assert in doStuff()??
Hi
If you are not clear about assertion preconditions and postconditions, go thru the sun tutorial

http://java.sun.com/j2se/1.4.2/docs/guide/lang/assert.html

ther is a clear explaination with easy examples
I am reating new xml fime using DOM.

TransformerFactory tf=TransformerFactory.newInstance();
Transformer serializer = tf.newTransformer();
serializer.transform(new DOMSource(xmlDocument),new StreamResult(oswWriter));

Is ther any way to check whether DOM transformer has Finished generating xml file?