Programming Forums > Application Development > Java

2roll4life7 · Nov 7th, 2005, 5:37 AM

Quote:

Originally Posted by massive-war

is it?

You don't need to import String because the whole java.lang package is compiled in with it. If you don't believe me just throw a verbose flag in next time you compile

Quote:

C:> javac -verbose MyClass.java

dangel55 · Nov 7th, 2005, 6:31 PM

Thanks!! the Monster Class is fixxed...

Next is the Room Class...

The addRoom(int) is reasonably simple. When addRoom(int) is called, it takes the value specified and stores it in the array intRooms[] at the location specified by intRoomCount. It then increases the pointer (intRoomCount) by one. Heres what i have so far..

(Toggle Plain Text)

public class Room

{

    int intRooms[];
    int intRoomCount = 0;

    
    
    
    public void addRoom(int NewRoom)
    {
        
        intRooms[intRoomCount] = NewRoom;
        ++intRoomCount;
        
    }

Ive tried compiling and testing but it say there is an error...

xavier · Nov 7th, 2005, 10:42 PM

What's the error ?

dangel55 · Nov 8th, 2005, 2:46 AM

Null exception error

xavier · Nov 8th, 2005, 3:11 AM

Try : intRoomCount ++;

dangel55 · Nov 8th, 2005, 6:13 PM

Got the same error, here is more detail:

java.lang.NullPointerException

at Room.addRoom(Room.java:14)

at RoomTest.main(RoomTest.java:33)

xavier · Nov 8th, 2005, 11:24 PM

int intRooms[] = new int [20] ; // for example
I guess u could have a method that determines the number of rooms you want : int totalRooms = ??? ;
and then have : int intRooms[] = new int [totalRooms];

dangel55 · Nov 9th, 2005, 9:59 PM

SWEET! it works now...now i just have to figure out the rest of the code...

At this point its the interface: it just needs to consist of three Buttons and a Label. Each of the three Buttons will represent one room that the user can enter. The Label will tell the user what room they are in.

To set things up, we need two things � a pointer, to know where we are, and an array of type Room.

My question is how should i declare this array?

Here is my Room Layout : -

Room 0: 1, 4, 5
Room 1: 0, 2, 7
Room 2: 1, 3, 9
Room 3: 2, 4, 11
Room 4: 0, 3, 13
Room 5: 0, 6, 14
Room 6: 5, 7, 16
Room 7: 1, 6, 8
Room 8: 7, 9, 17
Room 9: 2, 8, 10
Room 10: 9, 11, 18
Room 11: 3, 10, 12
Room 12: 11, 13, 19
Room 13: 4, 12, 14
Room 14: 5, 13, 15
Room 15: 14, 16, 19
Room 16: 6, 15, 17
Room 17: 8, 16, 19
Room 18: 10, 17, 19
Room 19: 12, 15, 18

xavier · Nov 9th, 2005, 11:03 PM

Use a matrix Room[20][3].

dangel55 · Nov 9th, 2005, 11:34 PM

I dont know how to use those, heheh thats a bit advanced for me...

Nov 7th, 2005, 6:31 PM	#12
dangel55 Newbie Join Date: Nov 2005 Posts: 11 Rep Power: 0	Thanks!! the Monster Class is fixxed... Next is the Room Class... The addRoom(int) is reasonably simple. When addRoom(int) is called, it takes the value specified and stores it in the array intRooms[] at the location specified by intRoomCount. It then increases the pointer (intRoomCount) by one. Heres what i have so far.. (Toggle Plain Text) public class Room { int intRooms[]; int intRoomCount = 0; public void addRoom(int NewRoom) { intRooms[intRoomCount] = NewRoom; ++intRoomCount; } public class Room { int intRooms[]; int intRoomCount = 0; public void addRoom(int NewRoom) { intRooms[intRoomCount] = NewRoom; ++intRoomCount; } Ive tried compiling and testing but it say there is an error...

Nov 7th, 2005, 10:42 PM	#13
xavier Professional Programmer Join Date: Oct 2004 Location: .ro Posts: 383 Rep Power: 4	What's the error ? __________________ Don't take life too seriously, it's not permanent !

Nov 8th, 2005, 3:11 AM	#15
xavier Professional Programmer Join Date: Oct 2004 Location: .ro Posts: 383 Rep Power: 4	Try : intRoomCount ++; __________________ Don't take life too seriously, it's not permanent !

Nov 8th, 2005, 11:24 PM	#17
xavier Professional Programmer Join Date: Oct 2004 Location: .ro Posts: 383 Rep Power: 4	int intRooms[] = new int [20] ; // for example I guess u could have a method that determines the number of rooms you want : int totalRooms = ??? ; and then have : int intRooms[] = new int [totalRooms]; __________________ Don't take life too seriously, it's not permanent !

Nov 9th, 2005, 11:03 PM	#19
xavier Professional Programmer Join Date: Oct 2004 Location: .ro Posts: 383 Rep Power: 4	Use a matrix Room[20][3]. __________________ Don't take life too seriously, it's not permanent !

Nov 8th, 2005, 2:46 AM	#14
dangel55 Newbie Join Date: Nov 2005 Posts: 11 Rep Power: 0	Null exception error

Nov 8th, 2005, 6:13 PM	#16
dangel55 Newbie Join Date: Nov 2005 Posts: 11 Rep Power: 0	Got the same error, here is more detail: java.lang.NullPointerException at Room.addRoom(Room.java:14) at RoomTest.main(RoomTest.java:33)

Nov 9th, 2005, 9:59 PM	#18
dangel55 Newbie Join Date: Nov 2005 Posts: 11 Rep Power: 0	SWEET! it works now...now i just have to figure out the rest of the code... At this point its the interface: it just needs to consist of three Buttons and a Label. Each of the three Buttons will represent one room that the user can enter. The Label will tell the user what room they are in. To set things up, we need two things � a pointer, to know where we are, and an array of type Room. My question is how should i declare this array? Here is my Room Layout : - Room 0: 1, 4, 5 Room 1: 0, 2, 7 Room 2: 1, 3, 9 Room 3: 2, 4, 11 Room 4: 0, 3, 13 Room 5: 0, 6, 14 Room 6: 5, 7, 16 Room 7: 1, 6, 8 Room 8: 7, 9, 17 Room 9: 2, 8, 10 Room 10: 9, 11, 18 Room 11: 3, 10, 12 Room 12: 11, 13, 19 Room 13: 4, 12, 14 Room 14: 5, 13, 15 Room 15: 14, 16, 19 Room 16: 6, 15, 17 Room 17: 8, 16, 19 Room 18: 10, 17, 19 Room 19: 12, 15, 18

Nov 9th, 2005, 11:34 PM	#20
dangel55 Newbie Join Date: Nov 2005 Posts: 11 Rep Power: 0	I dont know how to use those, heheh thats a bit advanced for me...

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