Character.forDigit

public String toString () {
 int year = super.getYear() + 1900;
 int month = super.getMonth() + 1;
 int day = super.getDate();

        char buf[] = "2000-00-00".toCharArray();
        buf[0] = Character.forDigit(year/1000,10);
        buf[1] = Character.forDigit((year/100)%10,10);
        buf[2] = Character.forDigit((year/10)%10,10);
        buf[3] = Character.forDigit(year%10,10);
        buf[5] = Character.forDigit(month/10,10);
        buf[6] = Character.forDigit(month%10,10);
        buf[8] = Character.forDigit(day/10,10);
        buf[9] = Character.forDigit(day%10,10);
  
 return new String(buf);
    }

 

 

得到具体的年月日后，在用 Character.forDigit   转换成 字符，是为了防止输入的年月日有问题， 大小只能为 0-9。等于多了一个验证。