Difference between Message View and Console Output view on JDeveloper 3.0

Question

Hello,
My name is Vani Bansoodeb and I have just started learning Java.
I am using Oracle JDeveloper 3.0 as IDE.
I was trying the Synch.java(see below) program to learn how to
use the "synchronized" key word.
However, I got 2 diffent outputs, depending on the output medium.
With the MESSAGE VIEW, I got the following output:
[Hello
[Synch
[World
With the CONSOLE WINDOW (i.e.DOS Prompt), I got the following output:
[Hello]
[Synch]
[World]
Could anyone please tell me why the right square bracket is printing on
a new line in the first case?
Thanx,
Vani
------------Synch.java--------------------------------------------------
class Callme {
synchronized void call(String msg) {
System.out.print("[" + msg);
try{
Thread.sleep(1000);
}catch(InterruptedException e){
System.out.println("Interrupted");
System.out.println("]");
class Caller implements Runnable{
String msg;
Callme target;
Thread t;
public Caller(Callme targ, String s){
target = targ;
msg = s;
t = new Thread(this);
t.start();
public void run(){
target.call(msg);
class Synch{
public static void main(String args[]){
Callme target = new Callme();
Caller ob1 = new Caller(target, "Hello");
Caller ob2 = new Caller(target, "Synch");
Caller ob3 = new Caller(target, "World");
try{
ob1.t.join();
ob2.t.join();
ob3.t.join();
}catch(InterruptedException e){
System.out.println("Exception Interrupted");
}

Answer 1

Thanks for your feedback,
What I was wondering is: Why has the db to look for distinct values? There is a unique ocnstraint on this column so the DB should in advance know that there will be no dublicate.
It would be intressting to check in the Oracle Optimizer does it the same way on a 10g DB.