我有一个分支将系统星期整数值替换为人类可读的字符串值。
当我像下面这样使用 if-else 语句时,Android Studio 1.1 不会发出任何警告。
int intDayOfWeek = calendar.get(Calendar.DAY_OF_WEEK);
String curStrDayOfWeek = "";
if (intDayOfWeek == 1) {
curStrDayOfWeek = getResources().getString(R.string.sunday);
}
else if(intDayOfWeek == 2) {
curStrDayOfWeek = getResources().getString(R.string.monday);
}
else if(intDayOfWeek == 3) {
curStrDayOfWeek = getResources().getString(R.string.tuesday);
}
[SNIP]
globals = (Globals) this.getApplication();
try {
[SNIP]
globals.hdsr_data.put("currentDayOfWeek", curStrDayOfWeek);
[SNIP]
catch (Exception e) {
System.out.println("Error:" + e);
}
[SNIP]
但是如果我尝试像下面这样使用 switch-case 语句,它会警告分配给 curStrDayOfWeek 的值 getResources().getString(R.string.sunday) 永远不会被使用。然后我收到 6 个警告,因为值有 7 个分支。
int intDayOfWeek = calendar.get(Calendar.DAY_OF_WEEK);
switch (intDayOfWeek) {
case 1 : curStrDayOfWeek = getResources().getString(R.string.sunday);
case 2 : curStrDayOfWeek = getResources().getString(R.string.monday);
case 3 : curStrDayOfWeek = getResources().getString(R.string.tuesday);
[SNIP]
}
我想在没有警告的情况下编写代码(拼写错误除外)。如何在没有警告的情况下使用 switch-case 语句?
最佳答案
But if I try to use switch-case statement like the following, it warns the value
getResources().getString(R.string.sunday)
assigned tocurStrDayOfWeek
is never used.
这是绝对正确的 - 因为您会立即掉到下一个分支。您需要一个 break
语句:
switch (intDayOfWeek) {
case 1:
curStrDayOfWeek = getResources().getString(R.string.sunday);
break;
case 2:
curStrDayOfWeek = getResources().getString(R.string.monday);
break;
case 3:
curStrDayOfWeek = getResources().getString(R.string.tuesday);
break;
...
}
不过我个人可能只是构建一个数组:
private static final int[] DAY_NAME_RESOURCES = {
0, // not used
R.string.sunday,
R.string.monday,
R.string.tuesday,
...
};
然后使用:
curStrDayOfWeek = getResource().getString(DAY_NAME_RESOURCES[i]);
关于java - 带有 switch case 语句的 Android Studio 1.1 警告,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/29877515/