我正在制作有关报告和查找丢失手机的概念证明程序。我正在浏览菜单，最终打印出内存位置而不是数据。
CellPhoneClass.java
import java.io.*;
import java.util.Scanner;
public class CellPhoneClass {
private /*int*/long cellID;
private String cellName;
private int cellCoordinateX;
private int cellCoordinateY;
public CellPhoneClass(/*int*/long id, String name)
{
cellID = id;
cellName = name;
}
public static void registerItem(String itemID, String owner, String status) throws IOException
{
FileWriter file = new FileWriter("itemRegister.txt");
BufferedWriter writer = new BufferedWriter(file);
writer.write(itemID + "\n");
writer.write(owner + "\n");
writer.write(status);
writer.close();
file.close();
}
public /*int*/long getID ()
{
return cellID;
}
public String getName()
{
return cellName;
}
public void updateCoordinate(int x, int y)
{
cellCoordinateX = x;
cellCoordinateY = y;
}
public void reportLostItem() throws IOException
{
FileWriter file = new FileWriter("itemLoss.txt");
BufferedWriter writer = new BufferedWriter(file);
Scanner input = new Scanner(System.in);
System.out.println("Please enter the lost item ID:");
while(input.hasNext())
{
if (input.hasNextInt())
{
writer.write(Integer.toString(input.nextInt()));
}
else
{
System.out.print("invalid ID!!!");
break;
}
}
input.close();
writer.close();
file.close();
}
}
ItemClass.java
public class ItemClass
{
private int CellID;
private String CellName;
private int cellCoordinateX;
private int cellCoordinateY;
public ItemClass(int CellID, String CellName, int cellCoordinateX, int cellCoordinateY)
{
this.CellID = CellID;
this.CellName = CellName;
this.cellCoordinateX = cellCoordinateX;
this.cellCoordinateY = cellCoordinateY;
}
public int CellID()
{
return CellID;
}
public String CellName()
{
return CellName;
}
public int cellCoordinateX()
{
return cellCoordinateX;
}
public int cellCoordinateY()
{
return cellCoordinateY;
}
}
ServerClass.java
import java.util.*;
import java.util.Scanner;
import java.io.*;
import java.util.Random;
public class ServerClass
{
public static void main(String[] args) throws IOException
{
//Array list of CellPhoneClass which keeps track of people who register their phone
//the string that is entered as their name is also used as the key for the hashmap
ArrayList<CellPhoneClass> cellList = new ArrayList<CellPhoneClass>();
HashMap<String, ItemClass> map = new HashMap<String, ItemClass>();
Scanner in = new Scanner(System.in);
int answer = 0;
boolean repeat = true;
boolean nextStep = intro(cellList, in);
if(nextStep == true)
{
System.out.println("Please register your phone with the app.");
System.out.print("Enter your phone number: ");
long cellNum = in.nextLong();
System.out.print("\nEnter your name: ");
in.nextLine();
String name = in.nextLine();
CellPhoneClass cell = new CellPhoneClass(cellNum, name);
cellList.add(cell);
}
while(repeat)
{
System.out.println("What would you like to do? \n\n1. Register a new item.");
System.out.println("2. Report an item lost.");
System.out.println("3. Report an item found.");
System.out.println("4. Exit");
System.out.print("\nEnter the number of what you would like to do: ");
if(in.hasNextInt() == true)
{
answer = in.nextInt();
}
else
{
answer = 5;
in.nextLine();
}
if(answer == 1)
{
readItem(map, in);
}
else if(answer == 2)
{
break;
}
else if(answer == 3)
{
break;
}
else if(answer == 4)
{
System.out.println("Good bye");
break;
}
else
{
System.out.println("\nInvalid input.\n");
}
}
}
//this method gets run first and lets the user login or register if they are new
//calls verify method if they claim to not be a new user and checks against ArrayList of cellphones
//if they are a new user, then they can register their phone and it will be added to the cellList
public static boolean intro(ArrayList<CellPhoneClass> cellList, Scanner in)
{
boolean register = false;
boolean user = false;
while(user == false)
{
System.out.println("Are you a new user?");
String response = in.next();
if(response.equalsIgnoreCase("Y"))
{
register = true;
user = true;
}
else if(response.equalsIgnoreCase("N"))
{
System.out.print("Enter your phone number: ");
in.nextLine();
long cellNum = in.nextLong();
System.out.print("\nEnter your name: ");
in.nextLine();
String name = in.nextLine();
user = verify(cellList, cellNum, name);
if(user == false)
{
System.out.println("User not found.");
}
register = false;
}
else
{
System.out.println("Invalid input.");
register = false;
}
}
return register;
}
//verify method checks the name and number entered by the user against the celllist
//it returns true if they have registered before or false if they have not
//if false then it will output an error and take them through the process again
public static boolean verify(ArrayList<CellPhoneClass> cellList, long cellNum, String name)
{
boolean user = false;
while(user == false && cellList.size() != 0)
{
for(int i = 0; i < cellList.size(); i++)
{
if(name.equals(cellList.get(i).getName()))
{
if(cellNum == cellList.get(i).getID())
{
user = true;
break;
}
}
}
}
return user;
}
//I made these methods to generate some random x and y coordinates between -150 and 150
public static int randomX()
{
Random rand = new Random();
int x = rand.nextInt(150-(-150))-150;
return x;
}
public static int randomY()
{
Random rand = new Random();
int y = rand.nextInt(150-(-150))-150;
return y;
}
//readItem method gets info from the user and calls registerItem from cellPhoneClass
//registerItem writes the information to the file --> itemRegister.txt
//then readItem reads that information and creates an instance of the ItemClass
//the instance of ItemClass is then added to the hashmap where the name of the person
//who registered the item is used as the key
public static void readItem(HashMap<String, ItemClass> map, Scanner in) throws IOException
{
String status = "";
boolean repeat = true;
System.out.print("To register a new item, enter an Item ID: ");
int itemID = in.nextInt();
System.out.print("\nNext, enter the owner's name: ");
in.nextLine();
String owner = in.nextLine();
System.out.print("\nIs this item lost or found? Type L for lost or F for found.");
String check = in.next();
while(repeat)
{
if(check.equalsIgnoreCase("L"))
{
status = "lost";
break;
}
else if(check.equalsIgnoreCase("F"))
{
status = "found";
break;
}
else
{
System.out.println("That input is invalid. Type L for lost or F for found.");
}
}
int cellCoordinateX = randomX();
int cellCoordinateY = randomY();
CellPhoneClass.registerItem(Integer.toString(itemID), owner, status);
try
{
BufferedReader inputStream = new BufferedReader(new FileReader("itemRegister.txt"));
String line = "";
int i = 0;
while((line = inputStream.readLine()) != null && i < 3)
{
if(i == 0)
{
itemID = Integer.parseInt(line);
/*test*/System.out.println(itemID);
}
else if(i == 1)
{
owner = line;
/*test*/System.out.println(owner);
}
else if(i == 2)
{
status = line;
/*test*/System.out.println(status);
}
i++;
}
inputStream.close();
}
catch(FileNotFoundException e)
{
System.out.println("The file you're attempting to read from does not exist.");
}
catch(IOException e)
{
System.out.println("Error reading from the file");
}
ItemClass item = new ItemClass(itemID, owner, cellCoordinateX, cellCoordinateY);
map.put(owner, item);
/*test*/for(String key : map.keySet())
{
System.out.print(key + " " + map.get(key));
}
}
}
Are you a new user?
y
Please register your phone with the app.
Enter your phone number: 1
Enter your name: bob
What would you like to do?
1. Register a new item.
2. Report an item lost.
3. Report an item found.
4. Exit
Enter the number of what you would like to do: 1
To register a new item, enter an Item ID: 2
Next, enter the owner's name: jon
Is this item lost or found? Type L for lost or F for found.L
2
jon
lost
jon ItemClass@5ba23b66What would you like to do?
在不应该的情况下最终输出jon ItemClass @ 5ba23b66。它应该只打印出带有ItemID号的jon。