Need Help with a class

[Sizzlewump]

I just realized that the driver class TestSmallRoom only passes one argument to a SmallRoom object: the roomNumber variable. I have changed my constructor to:

// constructor
	public SmallRoom( String roomNumber )
	{
	   roomNumber = null; // I was trying to initialize some variables here..
		p = null;
	}

and now my error log looks like this:

TestSmallRoom.java:26: enter(java.lang.String) in SmallRoom cannot be applied to (Tutor)
room1.enter(alan);
^
TestSmallRoom.java:29: enter(java.lang.String) in SmallRoom cannot be applied to (Student)
room2.enter(prakash);
^
TestSmallRoom.java:35: enter(java.lang.String) in SmallRoom cannot be applied to (Student)
room1.enter(bill); // rejected since already occupied
^
TestSmallRoom.java:46: leave(java.lang.String) in SmallRoom cannot be applied to ()
p = room2.leave();
^
TestSmallRoom.java:52: enter(java.lang.String) in SmallRoom cannot be applied to (Student)
room3.enter(bill);
^
TestSmallRoom.java:54: leave(java.lang.String) in SmallRoom cannot be applied to ()
room4.enter(room3.leave()); // Bill moves from room3 to room4
^
6 errors

[Norm]

All your errors appear to be mismatched types. The compiler requires that you use the correct type as parameter to a method.
Check all the method definitions and only pass a variable of the type they require as a parameter when you call the method.