java - 比较 2 个 ArrayList> 之间的字符串

Question

我有 2 ArrayList<HashMap<String,String>>

1. hashMapFinishedList
2. hashMapUnfinishedList

两个 hashMap 具有相同的属性但值不同，

我想对这两个Arraylist进行比较，如果它具有相同的值，则必须从第一个hashmap中删除它，

我尝试了这段代码:

public void compareData() {
    // TODO Auto-generated method stub
    Log.d("Location", "Arrive at compareData");
    String a, b;
    Log.d("Status",
            "Total Finished List "
                    + String.valueOf(hashMapFinishedList.size()));
    Log.d("Status",
            "Total Unfinished List "
                    + String.valueOf(hashMapUnfinishedList.size()));
    hashMapFixFinishedList.addAll(hashMapFinishedList);

    int count = 0;
    int count2 = 0;
    int size = hashMapFinishedList.size();
    for (int i = 0; i < size; i++) {
        count++;
        Log.d("Status",
                "Inside Looping FinishedList, Looping "
                        + String.valueOf(count));

        for (int j = 0; j < hashMapUnfinishedList.size(); j++) {
            count2++;
            Log.d("Status", "Inside Looping UnfinishedList, Looping ke "
                    + String.valueOf(count2));
            a = hashMapFinishedList.get(i).get("finishedListId");
            b = hashMapUnfinishedList.get(j).get("unfinishedListId");
            if (a.equals(b)) {
                Log.d("Status", a + " is equal " + b);
                Log.d("Location",
                        "Attempt to remove "
                                + hashMapFinishedList.get(i).get(
                                        "finishedListTitle"));
                if (!(i > hashMapFixFinishedList.size()))
                    hashMapFixFinishedList.remove(i);

            } else
                Log.d("Status", a + " is not equal " + b);
        }
    }
}

但它只比较第一个 HashMap ，然后循环不会继续到下一个 HashMap ，

更让我担心的是，在我的 logcat 中，我的程序可能无法正确循环(虽然不太确定)，我的 hashmap 大小是 2，并且只循环一次。

这是我的 logcat，

03-14 17:35:36.195: D/Location(32341): Arrive at compareData
03-14 17:35:36.195: D/Status(32341): Total Finished List 2
03-14 17:35:36.195: D/Status(32341): Total Unfinished List 4
03-14 17:35:36.195: D/Status(32341): Inside Looping FinishedList, Looping 1
03-14 17:35:36.195: D/Status(32341): Inside Looping UnfinishedList, Looping ke 1
03-14 17:35:36.195: D/Status(32341): 21 is equal 21
03-14 17:35:36.195: D/Location(32341): Attempt to remove Fffgggh
03-14 17:35:36.195: D/Status(32341): Inside Looping UnfinishedList, Looping ke 2
03-14 17:35:36.195: D/Status(32341): 21 is not equal 44
03-14 17:35:36.195: D/Status(32341): Inside Looping UnfinishedList, Looping ke 3
03-14 17:35:36.195: D/Status(32341): 21 is not equal 46
03-14 17:35:36.195: D/Status(32341): Inside Looping UnfinishedList, Looping ke 4
03-14 17:35:36.195: D/Status(32341): 21 is not equal 48
03-14 17:35:36.195: D/Status(32341): Inside Looping FinishedList, Looping 2
03-14 17:35:36.195: D/Status(32341): Inside Looping UnfinishedList, Looping ke 5
03-14 17:35:36.195: D/Status(32341): 46 is not equal 21
03-14 17:35:36.195: D/Status(32341): Inside Looping UnfinishedList, Looping ke 6
03-14 17:35:36.195: D/Status(32341): 46 is not equal 44
03-14 17:35:36.195: D/Status(32341): Inside Looping UnfinishedList, Looping ke 7
03-14 17:35:36.195: D/Status(32341): 46 is equal 46
03-14 17:35:36.195: D/Location(32341): Attempt to remove Mau Coba Ah
03-14 17:35:36.195: D/AndroidRuntime(32341): Shutting down VM
03-14 17:35:36.195: W/dalvikvm(32341): threadid=1: thread exiting with uncaught exception (group=0x41a60c08)
03-14 17:35:36.200: E/AndroidRuntime(32341): FATAL EXCEPTION: main
03-14 17:35:36.200: E/AndroidRuntime(32341): Process: com.thesis.teamizer, PID: 32341
03-14 17:35:36.200: E/AndroidRuntime(32341): java.lang.IndexOutOfBoundsException: Invalid index 1, size is 1
03-14 17:35:36.200: E/AndroidRuntime(32341):    at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:255)
03-14 17:35:36.200: E/AndroidRuntime(32341):    at java.util.ArrayList.remove(ArrayList.java:403)
03-14 17:35:36.200: E/AndroidRuntime(32341):    at com.thesis.teamizer.ViewTaskToDoList.compareData(ViewTaskToDoList.java:180)
03-14 17:35:36.200: E/AndroidRuntime(32341):    at com.thesis.teamizer.ViewTaskToDoList$AttemptGetTodolist.onPostExecute(ViewTaskToDoList.java:708)
03-14 17:35:36.200: E/AndroidRuntime(32341):    at com.thesis.teamizer.ViewTaskToDoList$AttemptGetTodolist.onPostExecute(ViewTaskToDoList.java:1)
03-14 17:35:36.200: E/AndroidRuntime(32341):    at android.os.AsyncTask.finish(AsyncTask.java:632)
03-14 17:35:36.200: E/AndroidRuntime(32341):    at android.os.AsyncTask.access$600(AsyncTask.java:177)
03-14 17:35:36.200: E/AndroidRuntime(32341):    at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:645)
03-14 17:35:36.200: E/AndroidRuntime(32341):    at android.os.Handler.dispatchMessage(Handler.java:102)
03-14 17:35:36.200: E/AndroidRuntime(32341):    at android.os.Looper.loop(Looper.java:146)
03-14 17:35:36.200: E/AndroidRuntime(32341):    at android.app.ActivityThread.main(ActivityThread.java:5602)
03-14 17:35:36.200: E/AndroidRuntime(32341):    at java.lang.reflect.Method.invokeNative(Native Method)
03-14 17:35:36.200: E/AndroidRuntime(32341):    at java.lang.reflect.Method.invoke(Method.java:515)
03-14 17:35:36.200: E/AndroidRuntime(32341):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)
03-14 17:35:36.200: E/AndroidRuntime(32341):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
03-14 17:35:36.200: E/AndroidRuntime(32341):    at dalvik.system.NativeStart.main(Native Method)

你能帮我找到答案，甚至是正确的代码吗？

第 180 行是 hashMapFixFinishedList.remove(i);

提前谢谢您..

Answer 1

当你删除 1 个值时，你的 hashMapFinishedList 大小为 2，然后它从 for 循环中出来，因为大小变为 1

 i < hashMapFinishedList.size(); //and this condition becomes false.

这就是它从循环中出来的原因

试试这个方法..

int size =hashMapFinishedList.size();


 for (int i = 0; i < size; i++) //now use this size in your main for loop

希望它有效..!

如果您希望所有数据都在单个 hashMap 中且没有重复的值，那么只需创建一个新的 Hashmap 并

 hashmap.addAll(hashmap1.values());
 hashmap.addAll(hashmap2.values());

它会自动删除重复的值。