How do i do this method(objects)

[Meta]

i have a program here with a bunch of constructors and methods. the last method i dont understand. theres comments about what it should do. also the method before the last, did i do that one right?

public class Airport
{

  // instance variables
  private String airportCode;
  private int gates;

  // 1. ***** Add a static class variable *****
  //  countAirports is an int
  //  assign an initial value of 0
	static int countAirports = 0;

  // 2. ***** Modify this method *****
  // Default constructor:
  // method name: Airport
  // return value:  none
  // parameters: none
  // function: sets the airportCode to an empty String
  //    ***** add 1 to countAirports class variable
  public Airport( )
  {
     airportCode = "";

  }

  // 3. ***** Modify this method *****
  // Overloaded constructor:
  // method name: Airport
  // return value: none
  // parameters:  a String airport code and an int startGates
  // function: assigns airportCode the value of the
  //      startAirportCode parameter;
  //      calls the setGates method,
  //      passing the startGates parameter
  //    ***** add 1 to countAirports class variable
  public Airport( String startAirportCode, int startGates )
  {
     airportCode = startAirportCode;
     setGates( startGates );
     countAirports += 1;
	
  }

  // Accessor method for the airportCode instance variable
  // method name: getAirportCode
  // return value: String
  // parameters: none
  // function: returns airportCode
  public String getAirportCode( )
  {
     return airportCode;
  }

  // Accessor method for the gates instance variable
  // method name: getGates
  // return value: int
  // parameters: none
  // function: returns gates
  public int getGates( )
  {
     return gates;
  }

  // 4. ***** Write this method *****
  // Accessor method for the countAirports class variable
  // method name: getCountAirports
  // return value: int
  // parameters: none
  // function: returns countAirports

	public int getCountAirports()
	{
		return countAirports;
	}


  // Mutator method for the airportCode instance variable
  // method name: setAirportCode
  // return value: void
  // parameters: String newAirportCode
  // function: assigns airportCode the value of the
  //                    newAirportCode parameter
  public void setAirportCode( String newAirportCode )
  {
     airportCode = newAirportCode;
  }

  // Mutator method for the gates instance variable
  // method name: setGates
  // return value:  void
  // parameters: int newGates
  // function: validates the newGates parameter.
  //   if newGates is greater than 0, sets gates to newGates;
  //   otherwise, prints an error message to System.err
  //   and does not change value of gates
  public void setGates( int newGates )
  {
     if ( newGates  >=  0 )
       gates = newGates;
     else
     {
       System.err.println( "Gates must be at least 0" );
       System.err.println( "Value of gates unchanged." );
     }
  }

  // 5. ***** Write this method *****
  // method name:  toString
  // return value: String
  // parameters: none
  // function:  returns a String that contains the airportCode
  //    and gates

	public String toString()
	{
		String codeAndGate = "airportCode" + gates;
		return codeAndGate;
	}




  // 6. ***** Write this method *****
  // method name: equals
  // return value: boolean
  // parameter:  Airport object
  // function:  returns true if airportCode
  //     and gates in this object
  //    are equal to those in the parameter object;
  //    returns false otherwise

	public boolean equals(Airport Object)
	{
		
	}





   }  // end of Airport class definition

[Fubarable]

Please see my comments:

public class Airport
{
  // code deleted...

  // 2. ***** Modify this method *****
  //    ***** add 1 to countAirports class variable  ---- !! Have you done this yet?
  public Airport( )
  {
     airportCode = "";

  }


  // 4. ***** Write this method *****   ---- !! I'd make this method static.
	public int getCountAirports()
	{
		return countAirports;
	}


  // 5. ***** Write this method *****
  // method name:  toString
  // return value: String
  // parameters: none
  // function:  returns a String that contains the airportCode
  //    and gates

	public String toString()
	{
		// ---- !! Incorrect: you're returning a String that states "airportCode" 
		// ---- !! when you should be returning the contents of the airportCode variable instead.
		String codeAndGate = "airportCode" + gates;  // !! incorrect
		return codeAndGate;
	}

  // 6. ***** Write this method *****
  // method name: equals
  // return value: boolean
  // parameter:  Airport object
  // function:  returns true if airportCode
  //     and gates in this object
  //    are equal to those in the parameter object;
  //    returns false otherwise

//	public boolean equals(Airport Object)
//	{
//		// ---- !! This method signature is wrong.  It should be:
//	}


	// ---- !! better:
	public boolean equals(Object otherObj)
	{
		// ---- !! You will need to first cast otherObj into an Airport variable:
		Airport otherAirport = (Airport) otherObj;

		// ---- !! and then try to write if statements to see if the gates variables and 
		// ---- !! the airportCode variables for the current object and otherAirport are the same
	}

   }