java - 错误消息 - java :24: Incompatible types

Question

每次尝试编译程序时，我都会收到此错误消息:

SeasonTest.java:24: incompatible types
found   : java.lang.String
required: int
        int date = ("" + mo + day);
                           ^
1 error

我正在尝试连接两个整数以在字符串返回方法中形成另一个整数变量:

static String season (int month, int day)
{
    int date = ("" + month + day);

    String season;

    if (date >= 316 && date <= 615)
    {
        season = "spring";
        return season;
    }

我已经尝试过它，但我根本不明白问题出在哪里。

Answer 1

这个初始代码

int date = ("" + month + day); // Yields a string.

应该是这样的。

Calendar c = Calendar.getInstance(); // get a calendar instance.
int date = day;
for (int i = 0; i < month; i++) {
  c.set(Calendar.MONTH, i); // set the month.
  date += c.getActualMaximum(Calendar.DAY_OF_MONTH); //how many days are in that month?
}