Running the Program

Here is how the program runs. It is actually the bytecodes that are executed. However it is convenient to discuss how the program works in terms of its statements, starting at main().

class HelloObject                                 // 2a.  The class definition is
{                                                 //      used to make the object

  void speak()                                    // 2b.  A speak() method
  {                                               //      is included in the object.


    System.out.println("Hello from an object!");  // 3a.  The speak() method
                                                  //      of the object prints a
                                                  //      message on the screen.

                                                  // 3b.  The method returns to the
                                                  //      caller.
  }
}

class HelloTester
{
  public static void main ( String[] args )       // 1.  Main starts running.
  {
    HelloObject anObject = new HelloObject();     // 2.  A HelloObject 
                                                  //     is created using its
                                                  //     default constructor.

    anObject.speak();                             // 3.  The object's speak() 
                                                  //     method is called.

  }                                               // 4.  The entire program is finished.
}