sweety sinha

thanks guys.

What should I do next?

I cleared my SCJP5.0 with 88%.
Thanks each & everyone who helped me in my preparations & especially Deevaka Coorey for the examlab.

Thanks
Sweety

thanks Ankit & Joshua Ebarvia for quick response

Map s = new HashMap(); s.put("ram","1"); s.put("ram","2"); s.put("ram2","3"); s.put("ram","4"); s.put("ram2","5"); System.out.println(s); System.out.println(s.size());

when this code runs print
ram2=5 ram=4
and size 2 but here no hashCode is used so it should print size 5

please help

thanks in advance

public static void main(String args[]) throws Throwable { try{ getMe(); }catch(ArithmeticException ae){ System.out.print(1); }catch(ArrayIndexOutOfBoundsException ae){ System.out.print(2); }catch(NullPointerException ae){ System.out.print(3); }catch(RuntimeException ae){ System.out.print(4); }catch(Exception ae){ System.out.print(5); } } public static void getMe()throws ArithmeticException{ if(true) throw new NullPointerException(); // System.out.println("hello"); say line 1 throw new ArrayIndexOutOfBoundsException(); System.out.println("hello"); //1 } }

if line 1 is sifted to new position then it gives compilation error. But when it is at its original position why it is not giving error?

thanks in advance

i didn't get it. please explain.

thanks in advance

this question is from examlab

public class Fractal{ public static void main(String args[]){ Fractal ft=new SubFractal(); String s=(Fractal)ft.getOb().getMsg(); System.out.print(s); } public Object getOb(){ return new Fractal(); } public String getMsg(){ return "SuperStar"; } } class SubFractal extends Fractal{ public Fractal getOb(){ return new Fractal(); } public String getMsg(){ return "SubStar"; } }why it is giving compilation fail. please give me a detail explanation

thanks in advance

thanks both of you for the answer.
now i got it

class ThreadA extends Thread{ public synchronized void run(){ for(int i=0;i<2;i++){ try{ sleep(5*1000); }catch(InterruptedException e){ } System.out.println("thread name :" +Thread.currentThread().getName()); } } ThreadA(String s){ } ThreadA(){ } public static void main(String [] args) { Thread t2 = new Thread();//1 t2.start(); //1 ThreadA tha = new ThreadA();//2 tha.start();//2 System.out.println("thread main name :" +tha.currentThread().getName()); } }

when this code is run it gives answer as
thread main name :main
thread name :Thread-0
thread name :Thread-0


When i put 2 i place of 1 then the answer becomes

thread main name :main
thread name :Thread-1
thread name :Thread-1

So my question is why it is not showing both thread name i.e thread name :Thread-0 & thread name :Thread-1
i have also made run method synchronized.

thanks in advance

class checkdate { boolean b; checkdate(boolean a){ b = a; } public static void main(String[] args) { System.out.printf("%b",new checkdate(false)); } }

why this is giving true when it should give false as answer.

thanks guys for quick response

it SCJP book by K Siera & Berts Bates it is written that "hash map can have one null key & multiple null values" null values is alright but how can it has null key. then can values be retrieved from it.

please explain

Hello Ankit!!

Many Many Congrats & Good Wishes!!

still not very much clear
why length is 7 why not 11

thanks in advance

class H
{
public static void main(String []args)
{
String s1 = "this is token";
String []token = s1.split("\\w");
System.out.println(token.length);
for(String s : token)
System.out.println(s);

}
}
why this is printing length:7
and
nothing when System.out.println(s); is reached

thanks in advance