Question

我正在尝试制作一款可以检查一年中某一天的应用。每当我声明一个大于某个数字的数组时，我都会得到一个Stops响应消息。我该怎么办？

 public class Main extends Activity {

int[] payDays = new int[11];
int dayOfYear;
Calendar cal;

Intent goToSales, goToChains, goToCheck, goToReference;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);


    cal = Calendar.getInstance();
    dayOfYear = cal.get(Calendar.DAY_OF_YEAR);

    payDays = new int[11];

    payDays[0] = 60;
    payDays[1] = 88;
    payDays[2] = 123;
    payDays[3] = 151;
    payDays[4] = 179;
    payDays[5] = 214;
    payDays[6] = 242;
    payDays[7] = 270;
    payDays[8] = 305;
    payDays[9] = 333;
    payDays[10] = 361;
    payDays[11] = 31;

    // Phew! Checks when to send the notification
    if (dayOfYear == payDays[0] || 
        dayOfYear == payDays[1] ||
        dayOfYear == payDays[2] ||
        dayOfYear == payDays[3] ||
        dayOfYear == payDays[4] ||
        dayOfYear == payDays[5] ||
        dayOfYear == payDays[6] ||
        dayOfYear == payDays[7] ||
        dayOfYear == payDays[8] ||
        dayOfYear == payDays[9] ||
        dayOfYear == payDays[10] ||
        dayOfYear == payDays[11]) 
    {


        Notification noti = new Notification.Builder(this)
        .setContentTitle("MCHelper")
        .setContentText("It's the end of the year!")
        .setSmallIcon(R.drawable.notify2).build();
        noti.flags |= Notification.FLAG_AUTO_CANCEL;


        NotificationManager notiMan = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
          notiMan.notify(0, noti);

          Context context = getApplicationContext();
          CharSequence text = "Hello toast!";
          int duration = Toast.LENGTH_SHORT;

          Toast toast = Toast.makeText(context, text, duration);
          toast.show();   
    }

Answer 1

看看这个：

int[] payDays = new int[11];

现在您正尝试访问索引11：

payDays[11] = 31;

那不行。当您使用new int[size]（或任何其他类型的数组）创建包含size元素的数组时，从0开始到size 独占。< / p>

我怀疑你想要：

int[] payDays = new int[12];

（另外，我要么使用循环来检查数组是否包含特定值，或者更改顺序以使其按顺序排列，并使用Arrays.binarySearch。）

Answer 2

您声明您的阵列错误。而不是payDays = new int[11];你想要的payDays = new int[12];否则，你最终会访问超出界限的元素11并且你会收到错误。

Answer 3

数组索引从零开始。当您声明一个大小为11的数组时，将创建索引范围为0到10（总共11个元素）的数组元素 .Hence访问payDays [11] ]会抛出一个ArrayIndexOutOfBounds异常。

解决方案可能是

1）增加数组的大小 payDays = new int [12] ;

2）删除元素payDays [11] = 31;

数组导致我的程序崩溃

3 个答案: