Thread: Hello World program not generating output with NetBeans and Mac

Hi,

I am a rank beginner with Java. I have purchased "Java for Dummies" by Doug Lowe, and the first program is Hello World.

THIS CODE DOESN'T APPEAR TO DISPLAY OUTPUT

public class HelloApp
{
public static void main(String[] args)
{
System.out.println("Hello, World!");
}
}

THIS CODE DISPLAYS OUTPUT

public class CosineClass {
public static void main(String[] args) throws Exception {
double angle = Math.toRadians(90);
Cos cos = new Cos();
double cosine = cos.value(angle);
System.out.println("Cosine of angle "+angle+" is " + cosine);
}
}

I have NetBeans up and running, and it runs simple math calculations. The System.out line works with the math computation. But, for some reason, it won't print Hello World. Has anyone run into this?

When I named the class and method both HelloApp, it worked.

public class HelloApp {
/**
* @param args the command line arguments
*/
public static void HelloApp(String[] args)
{
System.out.println("Hello, World!");
}
}

--- Update ---

Create a new project. Select Categories = Java and Projects = Java Application.

Project Name = Dummies
Enable the "Create Main Class" checkbox. Accept the default 2-part name convention. The first instance of "dummies" is the package name. Change the second instance to "MainClass". Click the [Finish] button. Now, create a new class at the package level named "HelloApp". The program will look as follows:

/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package dummies;

/**
*
* @author dianamecum
*/
public class HelloApp {

public static void main(String[] args)
{
System.out.println("Hello, World!");
}
}