Thread: Need help on a basic matter

Hello,

I'm trying to build a basic java program to test what i know.
So far, it's not going anywhere.. lol

See my code below, as I have 1 main class called HOUSE, and subclasses called living.. kitchen.. and whatever
I have input variable like lenght and width and trying to "getarea". the result i'm getting is NULL.. and i don'T know why

Any ideas, and thanks for any support you may provide.

/**
*
* @author Daniel
*/
public class AlexHouse1 {
private static int Height = 12; // The height is the same for all rooms
private static int Lenght;
private static int Width;
private static int floors;
private static int HouseNumber = 33; // The House civic number
private static int HouseRooms = 4; // Number of room into the House
private static int YearConstruction = 2001;
private static String HouseStreet = "My street name"; // The Street name
private static String HouseCity = "Toronto"; // City Name
private static String HouseSize;
int temperature; // It's temperature, but i have not assiged value.
String HouseColor = "yellow"; // Outside color of the house


public class AlexHouse1Size {
public int Lenght = 0;
public int Width = 0;
public AlexHouse1Size(int a, int b){
Lenght = a;
Width = b;
}


public int getArea() {
return Lenght * Width;
}
AlexHouse1Size HouseSize = new AlexHouse1Size(12,15);

}






public class LivingRoom extends AlexHouse1 { // Subclaass Living Room
int LivingRoomLenght;
int LivingRoomWidth;
int LivingRoomLHeight = 8;
int LivingRoomSize;
String LivingRoomColor = "beige";
int LivingRoomTemperature;

}


public static void main(String[] args) {
AlexHouse1 House = new AlexHouse1(); // To create AlexHouse "object"



System.out.println("Alex House have a total of " + HouseRooms + " rooms");
System.out.println("and she was built in " + YearConstruction);
System.out.println("The house total height is " + Height);
System.out.println("The house size is " + HouseSize);
}

}

Ok, I don't know why i put capital letters everywhere.. I corrected that.

with this code:

/**
*
* @author Daniel
*/
public class AlexHouse1 {
private static int height = 12; // The height is the same for all rooms
private static int lenght;
private static int width;
private static int floors;
private static int houseNumber = 33; // The House civic number
private static int houseRooms = 4; // Number of room into the House
private static int yearConstruction = 2001;
private static String houseStreet = "My street name"; // The Street name
private static String houseCity = "Toronto"; // City Name
private static String houseSize;
int temperature; // It's temperature, but i have not assiged value.
String houseColor = "yellow"; // Outside color of the house


public class AlexHouse1Size {
public int lenght = 0;
public int width = 0;
public AlexHouse1Size(int a, int b){
lenght = a;
width = b;
}


public int getArea() {
return lenght * width;
}
// AlexHouse1Size HouseSize = new AlexHouse1Size(12,15);

}






public class LivingRoom extends AlexHouse1 { // Subclaass Living Room
int livingRoomLenght;
int livingRoomWidth;
int livingRoomLHeight = 8;
int livingRoomSize;
String livingRoomColor = "beige";
int livingRoomTemperature;

}


public static void main(String[] args) {
AlexHouse1 house = new AlexHouse1(); // To create AlexHouse "object"



System.out.println("Alex House have a total of " + houseRooms + " rooms");
System.out.println("and she was built in " + yearConstruction);
System.out.println("The house total height is " + height);
System.out.println("The house size is " + houseSize);
}

}

the result is :
run:
Alex House have a total of 4 rooms
and she was built in 2001
The house total height is 12
The house size is null
BUILD SUCCESSFUL (total time: 0 seconds)

I don't get why it's null..
Perhaps i should start from scratch all over.

Another question:
Where do you assign a value to the variable that is printing out as null?
If you don't give a String variable a value, its value will be null.