Class declaration with one method : Defining Class « Class Definition « Java Tutorial

1. Java Tutorial
2. Class Definition
3. Defining Class

public class MainClass
{
   public static void main( String args[] )
   { 
      GradeBook myGradeBook = new GradeBook(); 

      myGradeBook.displayMessage(); 
   }
}

class GradeBook
{
   public void displayMessage()
   {
      System.out.println( "Welcome to the Grade Book!" );
   }

}

Welcome to the Grade Book!