System.out.println(STX +"HELLO"+ ETX) ; ???

I hava one question I tried to display String which is
begins with a sign "STX - this is a sign 0x02 in Ascii
Table and ended with "ETX - this is a sign 0x03 in
Ascii Table" using System.out.println, and nothing,
console was empty. When I deleted STX and ETX i got
HELLO. I have question where is a problem. If you
know answer on my question please write it.
Thank you and Regards Sebastianhow do you define STX and ETX ?
either of these should be valid
public static final char STX = (char)0x02;
public static final char ETX = (char)0x03;or
public static final char STX = \u0002;
public static final char ETX = \u0003;if they still don't work, it may be because these two characters are unprintable

Similar Messages

System.out.println - Hello World Example

Hi All
I am using Apache Tomcat and trying t produce a simple output to the browser. Cannot get System.out.println to work. See code and out below:
begin code
<HTML>
<HEAD><TITLE>hello jsp</TITLE></HEAD>
<BODY>
<%@ page language='java' contentType='text/html' %>
<%
String message = "Hello World";
message = message + "\nAFTER";
System.out.println("BEFORE");
%>
<%= (message) %>
</BODY>
</HTML>
END code
--begin browser output
Hello World AFTER
end browser ouput
Would be grateful if someone could explain why the System.out.print statement cannot be seen in the browser output.
many thanks
Naresh

System.out prints to System.out. What that is depends:
In applets, (which the OP was not talking about) it is the Java Console.
In JSP, it's the same as any application by default.
You can change in Java what System.out prints to, but you don't often do this. But in JSP it doesn't print to the browser. JSP is not CGI, which does you the standard out as the destination for written data.

32-bit JDK 7 System.out.println not working in IDE

Hi folks,
I have a 64-bit Windows 7 OS.
Due to 3rd party library/jar dependencies, i had to install the 32-bit Java JDK 1.7 and Eclipse IDE.
I also installed NetBeans.
So i have a 64-bit OS and am running 32-bit Java JDK/JRE & IDEs.
The problem I am having is that my program's System.out.println("...") statements are not outputting strings to either IDE debug console.
Executing the compiled program from a command line/prompt produces the expected string output.
The basic "Hello, World" program is enough to cause this behaviour to start occurring.
I have not manually / intentionally changed any IDE-specific Debug Console or Windows environment settings.
One caveat: This same environment has worked successfully in the past ?! Yes, this is one of those "..it worked last week & yesterday and today it isn't and i swear i didn't do anything..." issue.
Thoughts ?

Thanks for the reply.
The 64-bit versions of Java & Eclipse were installed first.
When i discovered I had to use the 32-bit versions, i un-installed the 64-bit ones & installed the 32-bits.
Even after that initial un-install 64-bit/install 32-bit process, it was working.
I have also been installing the Windows 7 64-bit OS updates when i am informed of them.
I'm not sure if any of these would affect how the Eclipse / NetBeans IDEs behave.
Behaviour has been inconsistent.
Initially it was always working.
But over the past several days, it has been working less and less.
I don't have any large data structures.
This isn't a large complicated program, couple hundred lines, so i highly doubt that i'm doing anything to the resources, but something has changed.
The main project I am working on takes command line parameters, does some initial processing, produces output using System.out.printlns [SOP] then depending on the parameters, branches into 2 different processing paths, let's call them A & B. Each of these processing paths also use SOPs. When i run the program in the IDE going thru path A, sometimes the initial SOP statements will work and the SOP statements specific to path A will also work. If i immediately change the parameters to go thru path B & re-run it, not even the initial SOP statements before the branching decision work.
I've tried doing System.flush()s too - no affect.
I haven't tried the re-direction option to a file option you mentioned yet.
It always works from a command prompt - that is telling me that the Java SOPs are working properly, correct ?
Inside an Eclipse or NetBeans IDE, SOP output to the debug console is inconsistent.
Running from a command prompt, the SOPs always work.
It'd help to know if this an IDE issue, a Java issue, a Windows 7 issue so i can narrow down where to try and correct the situation.
I have a Windows XP VM set up, i'll try running the program there and see if there's a difference.
Thanks for your reply.

Functionality of System.out.println()

Hello,
can some one please explain me what happens
an System.out.println(); is called
for example when we are pass an Object reference of some class
it prints the address
what functionality is taking place internally.
which methods are called.

You can look for yourself. The source code for the classes in the core API is in src.zip in the JDK download.

System.out.println not showing up in the console

Hi,
I've some System.out.println statements in a static block in a Stateless
Session Bean. I could not see these outputs in the Weblogic console. I'm
using Weblogic 5.1 Any one faced this problem before? any help is
appreciated.
Thanks & Regards,
Nithi.

Take a look in the weblogic log files they might be redirecting std out.
"Ryan LeCompte" <[email protected]> wrote:
>
Hello Nithi,
I'm all out of ideas, unfortunately! However, check out the following
links for
some possible insight into the problem:
http://groups.google.com/groups?q=System.out.println+5.1+WebLogic&start=60&hl=en&lr=&ie=UTF-8&oe=UTF-8&selm=3d3df18e%40newsgroups.bea.com&rnum=69
http://groups.google.com/groups?q=System.out.println+5.1+WebLogic&start=70&hl=en&lr=&ie=UTF-8&oe=UTF-8&selm=3977417b%40newsgroups.bea.com&rnum=71
http://groups.google.com/groups?q=System.out.println+5.1+WebLogic&start=200&hl=en&lr=&ie=UTF-8&oe=UTF-8&selm=3bc20346%241%40newsgroups.bea.com&rnum=209
Best regards,
Ryan LeCompte
[email protected]
http://www.louisiana.edu/~rml7669
"Nithi Rajan" <[email protected]> wrote:
Hi Ryan,
Thanks for your reply and sorry for the long silence. I was on vocation.
Thre problem still remains.I'm very sure that the EJB
is deployed by WebLogic as I'm able to call some methods.
and I'm also calling EJB methods from Servlet. But my
System.out.println statments work fine in the Servlet and
not inside EJB (or anyother classes used by EJB).
Any one has faced similar problems? BTW am using WebLogic 5.1
Thanks in advance,
Regards,
Nithi.
"Ryan LeCompte" <[email protected]> wrote in message
news:[email protected]...
Hello Nithi,
I find it strange that your System.out.println statements are beingexecuted from
within your servlets, but not in your stateless session bean. Are
you
positive
that your EJB is being located and deployed by WebLogic? The statementsin
your
static { } block should be executed as soon as the WebLogic class
loader
finds
the class and loads it into the JVM. I would suggest examining theconsole
and
try to determine if your EJB is in fact being deployed. Are you invokingmethods
on the EJB inside of your servlets? Are you using any logging frameworkfrom within
the EJBs which would redirect output to a file?
Best regards,
Ryan LeCompte
[email protected]
http://www.louisiana.edu/~rml7669
"Nithi Rajan" <[email protected]> wrote:
Hi Ryan,
Thanks for your reply. The setting in the weblogic.properties is
as
follows.
weblogic.system.enableConsole=true
So, that tells me that I should see all the System.out.printlns right?
(Pleasecorrect me if I'm wrong). I can see all the System.out.println
from
my
servletand not from the Session Bean (even if the System.out.println
is
outside
static block).
Please let me know your thoughts.
Thanks & Regards,
Nithi.
"Ryan LeCompte" <[email protected]> wrote in message
news:[email protected]...
Hello Nithi,
Are you sure that you don't have WebLogic configured to redirect
all
messages
to a file instead of the console? Are you able to see yourSystem.out.println
statements when placed within other methods of your stateless sessionbean? Please
be a bit more specific.
Thank you,
Ryan LeCompte
[email protected]
http://www.louisiana.edu/~rml7669
"Nithi Rajan" <[email protected]> wrote:
Hi,
I've some System.out.println statements in a static block in a
Stateless
Session Bean. I could not see these outputs in the Weblogic console.
I'm
using Weblogic 5.1 Any one faced this problem before? any helpis
appreciated.
Thanks & Regards,
Nithi.

How does System.out.println(). Work inside src.zip file !

Hello guyz,
I was just wondering how System.out.println() worked so i opened up the src.zip file and checked the source code. But could not understand it. As written i remember
"out is an object encapsulated in the System class."
Thats ok. But i could not understand the code.
    public final static PrintStream out = nullPrintStream();
    private static PrintStream nullPrintStream() throws NullPointerException {
     if (currentTimeMillis() > 0) {
         return null;
     throw new NullPointerException();
    }Also when i ran the DJ Decompiler it decompiled it to this:
public class One
     public static void main(String args[])
          System.out.println("hello world");
import java.io.PrintStream;
public class One
    public One()
    public static void main(String args[])
        System.out.println("hello world");
}Also, why does it need to import PrintStream ?

Peter__Lawrey wrote:
I was just wondering how System.out.println() worked so i opened up the src.zip file and checked the source code.This value is a place holder. This value is changed as soon as enough of the JVM is initialised for printing to work.
Also, why does it need to import PrintStream ? It doesn't, but it is used in the code so DJ is including it just in case.Sorry,
But i don't understand at all.

How do you change system.out.println colour?

Hi, I am developing some basic rmi client/server applications, I have an 2D array on a central server being read/written by remote clients. all the development is using system.out. statements at the moment (hopefully being replaced by GUI later) my question is when a client remote calls a read operation, and reads an array location, eg x3, y4 I want to print the location contents in a different colour to indicate the read, at the moment the displayArray() simply has nested for loops to cycle through the array and System.out.println statements to get it to the screen. I wonder is there a simple way to change the colour of system.out type statements? thanks for any help

I could be wrong, but I don't think that is possible. The System.out and other streams are just streams of characters, and doesn't contain any data about the characters. You could possibly get it to work if you knew which terminal the stream was going to and if the terminal had escape commands that could set colors. BBS browsers have that functionality, but I think that would be a hard path to follow.
If you are printing out a lot of data and need some color to aid it's readability, try printing directly to your graphic context:
Graphics g = getGraphics();
g.setColor(Color.white);
g.drawString("Hello",100,100);

Tomcat Servlet: System.out.println in servlet not printing to catalina.out

Hello friends ,
When i m using System.out.println() in servlet its o/p should come in catalina.out but its not coming plz help me....one thing more can we replace exixting catalina.out file with new one...
please Help me soon.
Thanks

go to[u] TOMCAT_DIR/config/server.xml.
Open this xml file and find something like <Logger className="org.apache.catalina.logger.FileLogger"
              prefix="catalina_log." suffix=".txt"
              timestamp="true"/>and
<Logger className="org.apache.catalina.logger.FileLogger"
                 directory="logs" prefix="localhost_log." suffix=".txt"
            timestamp="true"/>You can change the log file name to another one.
It's much better to use a logger tool like log4j (http://logging.apache.org/log4j/docs/download.html) then using a System.out.println()...
hope that helps

Using System.out.println() in Scrapbook

I am working through some tutorials on formatting numbers:
http://docs.oracle.com/javase/tutorial/java/data/numberformat.html
I am trying to use scrapbook. I can't seem to get the result I am wanting from System.out.println("Hello world")...I get null. To be specific I am trying to inspect:
int i = 461012;
System.out.format("The value of i is: %d%n", i)In this case I get:
java.io.PrintStream@46b372
Something tells me that System.out.format can't work in a scrapbook. Is there a way without writing a main and running as java?

It seems that the format method returns the PrintStream (allowing you to chain method calls), and the return value is being printed.
You would get the output you're looking for, if you use the String.format() method, since that'll return the formatted String.

System.out.println in gui--- question

Hello People.
First of all, I'm new to the forums, so if it doesn't belong here, plese tell me where to post questions like this.
The Problem:
I have a GUI and another class,which contains the Program.
Here's the code of my class:
int Battle(String CharName) {
          System.out.println(CharName + " Is fighting agains a monster");
          while (CharHP > 0 && MonsterHP != 0) {
               MonsterHP = MonsterHP - CharDmg;
               System.out.println("The monster has " + MonsterHP + "Hitpoints left ");
               CharHP = CharHP - MonsterDamage;
               System.out.println(CharName + " has " + CharHP + " Hitpoints left");
          if (MonsterHP == 0) {
               System.out.println(CharName + "Has lost the fight!");
               CharEXP = CharEXP + 20;
               System.out.println("You have gained " + CharEXP + " Exp");
          if (CharHP == 0) {
               System.out.println("You have lost the fight!");
          return CharHP;
     }So what would be the code to print all the "System.out.println's" here into the gui test area?

camickr wrote:
Check out the [Message Console|http://www.camick.com/java/blog.html?name=message-console].
Just out of curiosity, how do you come up with ideas for all the awesome stuff on your blog?

System.out.println() in JUnit

Hi Everybody,
Can you please solve my confusion, weather System.out.println(); will work in JUnit or not.
When I wrote System.out.println in Junit i am not getting anything.
Thanks in advance
Ananda

Junit is also a java class which extends the junit.framework.TestCase.
So the System.out.println() method always works in the junit class.
Try this code:
import junit.framework.TestCase;
public class TestJUnitTest extends TestCase {
     public void testCase1() {
          System.out.println("hello");
          assertEquals(true, true);
}

System.out.println and Network Adapter problem

Hello,
I am encountering a 2 strange problems. I have 2 oracle application server instances, one dev and one production.
The first problem is when I type System.out.println in the JSP's i am able to see the output in both \opmn\logs\oc4jinstance. But the System.out.println in the java classes or bean show up only in development logs but not in production box.
Is there a setting I am missing here?
The second problem is on our development machine the application works fine, but as soon as we deploy the application on production I encounter:
could not open new connection: Io exception: The Network Adapter could not establish the connection
I have a class called DBUtils, which uses a 3rd party library to get connections from the connection pool as below. Using JSP I call the getConnection(). On my dev Oracle Application Server Instance it works fine, but on production I get the error. Can it be there is a setting that I am missing on the production box?
When I use a JSP and connect to the database without using the DBUtil class. I can connect to the database fine. Also using the DBUtil class with production oracle IP address on the development machine lets me connect with no problem, but production machine does not let me.
public class DBUtils {
static ConnectionPoolBean pool;
static {
System.out.println("DBUtils() - before connection pool bean");
pool = new ConnectionPoolBean();
pool.setDriverClassName("oracle.jdbc.driver.OracleDriver");
pool.setdbURL("jdbc:oracle:thin:@IPADDRESS:PORT:SID");
pool.setUser("USERNAME");
pool.setPassword("PASSWORD");
pool.setInitialConnections(1);
pool.setIncrement(1);
pool.setSoftMaxConnections(40);
public static Connection getConnection() throws SQLException {
System.out.println("Getting Oracle Connection");
return pool.getConnection();
public static void returnConnection(Connection conn) throws SQLException {
System.out.println("Returning Connection");
pool.returnConnection(conn);
Thanks for your help in advance.

Hi
System.out.println is a method of PrintStream in IO which is used to print the output on console in java progs.Here in jsp ,the o/p is printed on server's console window.But out.println is totally different as, out is implicit object derived from JspWriter and is used sly to PrinWriter 's object is used in servlets.It's work is to write upon Browser.
System.out.println() is normally used in jsp for debugging purposes only.
Ashish

Where does the logging happens for System.out.println

Hello:
I'm usingNetWeaver 2004sJava SP9 evaluation version. Added some System.out.println to the ejbs. Would like to know where to look for the logging details in this case.
Thanks for your help,
Ravi

Hi,
By default, if the setting has been done, then it appears in defaultTrace as mentioned. For configuration of it, refer to this link.
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/db315878-0801-0010-928e-98c8283616d3
Reward points if it helps.
Regards,
Vijai

Unicode in System.out.println()

Hello All,
Can somebody help me figure out why the following code prints '?'.
import java.io.*;
class Test {
public static void main(String args[]) throws Exception {
System.out.println("\u0080");
PrintWriter aPrintWriter = new PrintWriter(System.out);
aPrintWriter.write("\u0080");
aPrintWriter.flush();
What needs to be done to get the actual character that is expected.
Nischal

Can somebody help me figure out why the following code
prints '?'. It's because of the character set of your console.
System.out is a PrintStream which works with bytes not with characters.
You can use
OutputStreamWriter osw = new OutputStreamWriter(System.out, "ISO-8859-1")
PrintWriter myPrintWriter = new PrintWriter( osw);
myPrintWriter.write( "\u0080");of course you'll have to use the character set your console uses.

System.out.println method

hi, i am new to java. plz help...thx
i would to do the following task.
i would like to print "hello world" every 1 second, such that:
while(true){
System.out.println("hello world\n");
--> wait for one second;
how to write the "wait for one second coding"?
thx all , and urgent...

You can use Thread.sleep(1000) to wait.
However, Thread.sleep(1000) cannot wait exact 1 sec.
while (true) {
System.out.println("...");
try {
Thread.sleep(1000);
catch (Exception ex) {}
And you don't need to use '\n' because println() prints always '\n'.

System.out.println(STX +"HELLO"+ ETX) ; ???

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