原谅我，我是Java新手！并且是用于一个大学项目，我在一些概念上遇到了麻烦，我试图在Google周围搜索都无济于事！如何在MarsRoom类内部实例化一定数量的加热器类的加热器，然后在MasterControlPanel的主目录中对其进行访问。但是取决于构造函数中设置的数字加热器数量。我已经尝试过了，但是它无法识别对象room1.roomheaters [0]。但是，如果我只实例化一个对象（例如Heaters roomheaters = new Heaters（）;），它就会识别出它。
非常感谢
public class MasterControlPanel{
public static void main(String[] args){
MarsRoom room1 = new MarsRoom(40, 40, 20, 20, 8, 2, 4);
MarsRoom room2 = new MarsRoom(40, 40, 20, 20, 8, 2, 4);
MarsRoom room3 = new MarsRoom(40, 40, 20, 20, 8, 2, 4);
MarsRoom room4 = new MarsRoom(40, 40, 20, 20, 8, 2, 4);
room1.createheaters();
System.out.println("Turned " + (room1.roomheaters[0].getHeater() ? " ON" : " OFF"));
}
}
public class MarsRoom extends Rooms implements RoomInterface{
int roomareasq;
int heatloss;
float insideTemp;
float outsideTemp;
float uvalue;
int numheaters;
int numlights;
Heaters roomheaters[] = new Heaters[numheaters];
public MarsRoom(){
}
public MarsRoom(int windowsH, int windowsW, int wallsH, int wallsW, int windowC, int heaters, int lights){
windowsHeight = windowsH;
windowsWidth = windowsW;
wallsHeight = wallsH;
wallsWidth = wallsW;
windowCeiling = windowC;
numheaters = heaters;
numlights = lights;
}
public void createheaters(){
for (int i=0; i < numheaters; i++)
{
roomheaters[i] = new Heaters();
}
}
public void calculateheatloss(){
}
}
最佳答案
数组roomheaters从未声明过，因此无法填充它，更不用说从另一个类将其作为MarsRoom的属性来访问了：
roomheaters[i] = new Heaters();
// variables must be declared to be assigned
看看declaring member variables
更新
要将变量作为对象属性（如
room1.roomheaters[0]）访问，它必须是成员变量。您只创建了一个局部变量，该局部变量在函数返回后立即消失。上面的链接应该有所帮助。