Java J2SE Hello World sample program
Contributed by Rex 
Tagged: Java programming The Hello World program (one that just prints Hello World to the screen) has long been a staple first application for a programmer to try out a new programming language. This recipe describes the steps involved in compiling and running a simple Hello World program in Java.
You must first download a Java JDK on your system (check first, there may already be one.. look for an executable called javac or javac.exe). Look for the highest version number that does not end in RC (for release candidate). Make sure to download the JDK (Java Development Kit), not the JRE (Java Runtime Environment). The develepment kit includes the java compiler. Install the JDK as described in the release notes for your platform.
In your favorite editor, create a file called HelloWorld.java with the following contents:
class HelloWorld
{
public static void main(String args[])
{
System.out.println("Hello World!");
}
}
From a command line, the command to compile this program is:
javac HelloWorld.java
For this to work, the javac must be in your shell’s path or you must explicitly specify the path to the program (such as c:\j2se\bin\javac HelloWork.java). If the compilation is successful, javac will quietly end and return you to a command prompt. If you look in the directory, there will now be a HelloWorld.class file. This file is the compiled version of your program.
To run the program, you just run it with the java command:
java HelloWorld
It is important to note that you use the full name with extension when compiling (javac HelloWorld.java) but only the class name when running (java HelloWorld).
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efren said on November 26, 2008
GOOD
efren said on November 26, 2008
NICE WORK
Johnny said on November 27, 2008
what if I don’t have javac…. When installed…. javac is missing in java 1.6.0
marjorie pagalan said on January 24, 2009
please create a new simple program not only a hello world
thank you
marjorie pagalan said on January 24, 2009
yung maganda naman po!!!
nakakasawa kasi lagi nalang hello wolrd alam
na kaya namin yun lahat yung iba naman para kakaiba dibah!!!
marjorie pagalan said on January 24, 2009
elow do know how to create a program in java
please reply to me i will wait
thank you
prasad said on January 29, 2009
hi my name prasad i am run simple program in that program only compile
after compile the program run the program shows the message Exception in thread “main” java.lang.NoClassDefFoundError this will appear what is the
problem plz send me reply
Edukondala Venkata Reddy said on March 10, 2009
Executing your program using this command should correct the problem:
java -classpath . helloworld
Edukondala Venkata Reddy said on March 10, 2009
nice language… Seems to be java7 version.
Edukondala Venkata Reddy said on March 10, 2009
Useful blog.
ashish anand said on June 30, 2009
thank u very much Mr Reddy..
ashish
Anonymous said on July 14, 2009
Nice, thank you guy
honey said on July 15, 2009
hi poh i’m honey do u know how to program about average??
honey said on July 15, 2009
yes i am coputer science student
Anonymous said on February 16, 2010
no answer fot this program,iam using jdk1.3
Anonymous said on February 16, 2010
good think
kush om sharma said on June 16, 2010
aap ney jo “hello ka program” dea usko bhi execute kraya ye to execute ho gya but mera bnaya program execute nhi ho rha hai same problem exception in thread “main”…..etc please tell me how remoove this problem ????
Skyzthelimit said on June 28, 2010
trying to create and run a random access file getting a error of exception in thread “main” java.lang
Karunasanapala said on August 26, 2010
but no use
Prasanna said on April 12, 2011
Good example
B Sravankumar1990 said on April 13, 2011
first write program on notepad and save it as .java
javac filename.java for compiling and
java filename for running
or call to 7569891072
B Sravankumar1990 said on April 13, 2011
give the class name as the filename.first letter of filename and classname must capital letter
Vincentcastro_93 said on July 9, 2011
What does this eror mean?
Exception in thread “main” java.util.InputMismatchException at java.util.Scanner.throwFor(Scanner.java:840) at java.util.Scanner.next(Scanner.java:1461) at java.util.Scanner.nextInt(Scanner.java:2091) at java.util.Scanner.nextInt(Scanner.java:2050) at Case.bubbleSort(Case.java:40) at Case.main(Case.java:24)
govindarao said on October 12, 2011
plz send me core java simple programs