Android 如何复制二维数组，使内容指向同一位置；java.lang.NullPointerException:尝试写入空数组

我有2个数组->字符串[]停止；字符串[][]票价；我想将它们传递给class对象->PostData。
但是我得到->java.lang.NullPointerException:尝试写入空数组。 因此，另一个问题是如何复制二维数组，使内容指向相同的位置

代码：
PostData。爪哇：

public class PostData {
    String url;
    String busNumber;
    int countStops;
    int countPairs;
    String [] Stops;
    String[][] fares;
    PostData(String urlArg, String  busNumberArg, int countStopsArg, int countPairsArg, String [] stopsArg, String[][] faresArg)
    {
        url = urlArg;
        busNumber = busNumberArg;
        countStops = countStopsArg;
        countPairs = countPairsArg;
        Stops = stopsArg;
        int c=0;
        for(String[] array:faresArg){
            fares[c++]=array;//null Pointer exception on this line
        }
    }
}

主要内容：

---

问题是您没有将票价数组初始化。 您需要这样做：

public class PostData {
    String url;
    String busNumber;
    int countStops;
    int countPairs;
    String [] Stops;
    String[][] fares;
    PostData(String urlArg, String  busNumberArg, int countStopsArg, int countPairsArg, String [] stopsArg, String[][] faresArg)
    {
        url = urlArg;
        busNumber = busNumberArg;
        countStops = countStopsArg;
        countPairs = countPairsArg;
        Stops = stopsArg;
        int c=0;
        fares = new String [faresArg.length][];
        for(String[] array:faresArg){
            fares[c++]=array;//null Pointer exception on this line
        }
    }
}

---

您在哪里创建了

票价的实例

这是否回答了您的问题？

public class PostData {
    String url;
    String busNumber;
    int countStops;
    int countPairs;
    String [] Stops;
    String[][] fares;
    PostData(String urlArg, String  busNumberArg, int countStopsArg, int countPairsArg, String [] stopsArg, String[][] faresArg)
    {
        url = urlArg;
        busNumber = busNumberArg;
        countStops = countStopsArg;
        countPairs = countPairsArg;
        Stops = stopsArg;
        int c=0;
        fares = new String [faresArg.length][];
        for(String[] array:faresArg){
            fares[c++]=array;//null Pointer exception on this line
        }
    }
}