I am learning Java, and am testing a simple 'Hello World' program given to me by my teacher. I am using Dr. Java on 64-bit Ubuntu 12.04 LTS.
Code is below:
public class Hello_World
{
public void go()
{
System.out.println("Hello, World!");
}
}
I hit the F5 key, and the code compiles. After that, I enter the lines below:
greet = new Hello_World();
greet.go();
The output is supposed to be Hello, World!
, but I am getting Static Error: Undefined name 'greet'
instead. What am I doing wrong?
Please forgive me if I this is an easy fix (it probably is). I searched SE, but did not find anything that helped.
it should be:
Hello_World greet = new Hello_World();
greet.go();
The class you defined is called Hello_Word not Hello.
EDIT
Your complete code should look something like:
public class Hello_World
{
public void go()
{
System.out.println("Hello, World!");
}
public static void main(String[] args){
Hello_World greet = new Hello_World();
greet.go();
}
}
You need the code:
Hello_World greet = new Hello_World();
greet.go();
in a main method, which is the point of execution of a java program. http://csis.pace.edu/~bergin/KarelJava2ed/ch2/javamain.html
Add the following code to your class
public static void main(String args[]){
Hello_World greet=new Hello_World();
greet.go();
}
Since you are running application on your console, you need to have a main()
method
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