What is the proper way to run a test program using java?

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Javascript

Java

// Sandwich.java

public class Sandwich
{ 
   private String mainIngt;
   private String breadType;
   private double price;  
   
   //Default Constructor:  
   public Sandwich ()
   {
      mainIngt = "";
      breadType = "";
      price = 0.0;
      }
   
   // Getters / Accessors:
   public String getMainIngt ()
   {
      return mainIngt;
      }
      public String getBreadType ()
   {
      return breadType;
      }
      public double getPrice ()
   {
      return price;
      }
   
   //Setters / Mutators:
      public void setMainIngt (String MainInt)
   {
      mainIngt = mainIngt;
      }
      public void setBreadType (String BreadType)
   {
      breadType = breadType;
      } 
      public void setPrice (double Price)
   {
      price = price;
      }

 }


// TestSandwich.java

public class TestSandwich
{
   public static void main (String[] args)
   {
      Sandwich justinsSupper = new Sandwich ();
      
      justinsSupper.setMainIngt ("Turkey");
      justinsSupper.setBreadType ("Sourdough");
      justinsSupper.setPrice (7.50);
      
      System.out.println ("Justin's Supper is " +  
            justinsSupper.getMainIngt () + "on" +
            justinsSupper.getBreadType () + " at a cost of $ " +
            String.format ("%.2f", justinsSupper.getPrice () )
           );
   }

}

What I have tried:

I have gotten rid of minor spelling errors, I think I may be compiling them wrong.
also, I keep getting "No main methods, JavaFX Application, Applets, or MIDlets found in file."