Question

我试图通过链表显示两个对象之间的邻接关系。当我试图打印出邻接时，它会跳过第一行。打印出来的是：

X



X

R   >>>   W

S   >>>   Y

T

W

R   >>>   Z

它应该是：

Q   >>>   X
R   >>>   x
P   >>>   R   >>>   W
W   >>>   S   >>>   Y
S   >>>   T
T   >>>   W
Y   >>>   R   >>>   Z

正如您所看到的，只打印出第二级和第三级，而不是所有级别。

相关代码：

public static void main(String[] args) throws FileNotFoundException {

    FlightMap flights = new FlightMap();
    flights.loadFlightMap("cityFile.txt", "flightFile.txt");
    Scanner requestInStream = null;

    requestInStream = new Scanner(new File("requestFile.txt"));

    //DEBUGGING
    String[] str = new String[] {"Q", "X", "R", "P", "W", "S", "T", "Y", "Z"};
    String temp = null;
    for ( int x = 0; x < str.length; x++) {
        temp = str[x];
        City city = new City(temp);
        flights.displayAdjacentCities(city);
    }

FlightMap类

//Read in the files from the main...
private int size = 0;
private City[] allCities;
private LinkedList<City>[] adjacents;

public FlightMap() {
}

@SuppressWarnings("unchecked")
public void loadFlightMap(String cityFileName, String flightFileName)
        throws FileNotFoundException {


    Scanner inStream = null;
    inStream = new Scanner(new File(cityFileName));
    while(inStream.hasNextLine()) {
        size++;
        inStream.nextLine();
    }
    inStream.close();
    allCities = new City[size];
    adjacents = (LinkedList<City>[]) new LinkedList[size];

    for(int x = 0; x < size; x++) {
        adjacents[x] = new LinkedList<City>();
    }

    Scanner inStream1 = null;
    inStream1 = new Scanner (new File(cityFileName));
    for(int x = 0; x <size; x++) {
        String input = inStream1.nextLine();
        allCities[x] = new City (input);
    }

    inStream1 = new Scanner (new File(flightFileName));
    String data;
    while (inStream1.hasNext()) {
        int flag = 0;
        data = inStream1.next();
        for (int i = 0; i < size && flag !=1; i++) {
            if(allCities[i].getName().equalsIgnoreCase(data)) {
                data = inStream1.next();
                for (int j = 0; j < size; j++) {
                    if (allCities[j].getName().equalsIgnoreCase(data)) {
                        adjacents[i].add(allCities[j]);
                        flag = 1;
                    }
                }
            }
        }
    }
    inStream1.close();
}

显示邻接方法：

public void displayAdjacentCities(City aCity) { 
    for(int x = 0; x < size; x++) {
        if (aCity.getName().equalsIgnoreCase(allCities[x].getName())) {
            Iterator<City> iter = adjacents[x].iterator();
            while(iter.hasNext()) {
                System.out.print(iter.next().getName());
                if(iter.hasNext()) {
                    System.out.print("   >>>   ");
                }
            }
            System.out.println("\n");
        }
    }

所有对象都在cityFile中：（每个单独一行）

Q
X
R
P
W
S
T
Y
Z

邻接在flightFile中（由两个字母之间的标签分隔，另一对分开：

Q   X
R   X
P   R
P   W
W   S
S   T
T   W
W   Y
Y   R
Y   Z

所需的路径在requestFile中：

Q   X
P   X
P   T
P   Z
P   X
P   Q
T   P
A   S
R   X
T   X
Q   X

我不确定我是否在问正确的问题。

Answer 1

示例答案看起来好像一个城市应该被认为与自身相邻？试试这个：

public void displayAdjacentCities(City aCity) { 
  for(int x = 0; x < size; x++) {
    if (aCity.getName().equalsIgnoreCase(allCities[x].getName())) {
       if (adjacents[x].size() == 0) continue;
       System.out.print(aCity.getName());
       for (City other : adjacents[x]) {
                System.out.print("   >>>   " + other.getName()); 
            }
            System.out.println();
        }
    }
}

为什么我的Linkedlist的第一层没有打印？

1 个答案: