我有一个分支,它将系统星期几整数值替换为人类可读的字符串值。
当我使用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]
但是如果我尝试使用如下所示的switch-case语句,它会警告值getResources()。从不使用分配给curStrDayOfWeek的getString(R.string.sunday)。然后我得到了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码(除了拼写错误)。如何在没有警告的情况下使用switch-case语句?
答案 0 :(得分:6)
但是,如果我尝试使用如下所示的switch-case语句,则会警告从未使用分配给
getResources().getString(R.string.sunday)
的值curStrDayOfWeek
。
这是绝对正确的 - 因为你会立即进入下一个分支。您需要break
声明:
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;
...
}
我个人可能只是建立一个数组:
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]);