我目前正在做一项作业,其中有两个班级
Room
和House
。作为作业的一部分,我需要启用 House
类来将 Room
存储在 ArrayList
中:
实现从键盘读取
类中的房间信息的方法 - 这应该根据需要调用House
构造函数。创建一个零参数 House 构造函数来调用这个新方法。Room
如果这含糊不清或已在其他地方得到回答,我深表歉意,但在尝试理解其他类似查询的解释后,我不知道如何将它们应用到我的情况。
如何将
ArrayList
的 Room
应用于 House
课程?
House
:
import java.util.ArrayList;
import java.util.Scanner;
public class House {
private int idNum;
private static int internalCount = 0;
private ArrayList rooms = new ArrayList();
private String address;
private int numRooms;
private String houseType;
public House (String address, int numRooms, String houseType) {
idNum = internalCount++;
this.address = address;
this.numRooms = numRooms;
this.houseType = houseType;
}
public House () {
int i = 0;
idNum = ++internalCount;
Scanner scan = new Scanner(System.in);
scan.useDelimiter("\n");
System.out.println("Enter address of house:");
address = scan.next();
System.out.println("Enter number of rooms:"); //Number of rooms in the House
numRooms = scan.nextInt();
while (i < numRooms) //This will loop until all rooms have been described
{
add.room = new Room[100]; //I understand this is incorrect but I don't know what I should have in here
i++;
}
System.out.println("Enter type of house:");
houseType = scan.next();
}
public void addroom(String description, double length, double width)
{
}
int getIdNum() {
return idNum;
}
@Override
public String toString()
{
String report = "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n";
report += "Address: " + address + "\n";
report += "No. of Rooms: " + numRooms + "\n";
report += "House Type: " + houseType+ "\n";
report += "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n";
return report;
}
}
Room
:
import java.util.Scanner;
public class Room {
private String description;
private double length;
private double width;
public Room (String description, double length, double width) {
this.description = description;
this.length = length;
this.width = width;
}
public Room () {
Scanner scan = new Scanner(System.in);
scan.useDelimiter("\n");
System.out.println("Enter description of room:");
description = scan.next();
System.out.println("Enter length of room:");
length = scan.nextDouble();
System.out.println("Enter width of room:");
width = scan.nextDouble();
}
/*
* Calculates and returns area of Room
*/
public double getArea () {
return length*width;
}
@Override
public String toString() {
return description + "- Length: " + length + "m; Width: " + width + 'm';
}
}
由于这是家庭作业,我不会完整解决它,但为您提供工作基础...
public class House {
private List<Room> rooms;
public House() {
rooms = new ArrayList<Room>();
}
public void addRoom(...) {
Room room = new Room(...);
rooms.add(room);
}
public int numRooms() {
return rooms.size();
}
public Room getRoom(int roomNumber) {
return rooms.get(roomNumber);
}
}
public class Room {
public Room(...) {
...
}
}
有疑问吗?
使用专业化将列表转换为
Room
类型
List<Room> rooms = new ArrayList<Room>();
while (i < numRooms) //This will loop until all rooms have been described
{
rooms.add(new Room()); //this is correct
i++;
}
ArrayList<Room> rooms = new ArrayList<Room>();
rooms.add(new Room());
更改构造函数方法,添加一些有关房间的代码
ArrayList
。
public House(..., ArrayList aRooms) {
...
rooms = aRooms;
}
public House() {
...
// It's better to instantiate the rooms array here.
rooms = new ArrayList<Room>();
}
要将房间添加到您的房间
ArrayList
,只需执行类似的操作(不要忘记检查ArrayList
API,http://docs.oracle.com/javase/6/docs/api/java/ util/ArrayList.html).
ArrayList<Room> rooms = new ArrayList<Room>();
rooms.add(new Room(...));
// Add here all the rooms you need.
House house = new House(rooms);
// You can also create a method into the House class to allow adding new rooms once you have created a House object.
public void addRoom(Room room) {
this.rooms.add(room);
}
更改此循环:
while (i < numRooms) //This will loop until all rooms have been described
{
add.room = new Room[100]; //I understand this is incorrect but I don't know what I should have in here
i++;
}
致:
while (i < numRooms)
{
Room newRoom = new Room();
rooms.add(newRoom);
i++;
}