用java写日期类使用三个整数记录年、月、日,其中月份的取值范围为1-12,日期的取值范围为1-31,尝试写出该类的构造函数,接受三个整数作为年月日的值,并验证月份和日期的有效性,当给出的日期数据无效时抛出自定义的日期范围异常,并写出测试代码,从不同的角度触发异常。
时间: 2023-11-23 11:05:41 浏览: 30
好的,我可以为您解答这个问题。以下是Java的日期类的构造函数实现和测试代码:
```java
public class Date {
private int year;
private int month;
private int day;
public Date(int year, int month, int day) throws DateRangeException {
if (month < 1 || month > 12) {
throw new DateRangeException("Invalid month: " + month);
}
if (day < 1 || day > 31) {
throw new DateRangeException("Invalid day: " + day);
}
if ((month == 4 || month == 6 || month == 9 || month == 11) && day == 31) {
throw new DateRangeException("Invalid day in month " + month + ": " + day);
}
if (month == 2) {
if (day > 29) {
throw new DateRangeException("Invalid day in February: " + day);
}
if (day == 29 && !isLeapYear(year)) {
throw new DateRangeException("Invalid day in non-leap year February: " + day);
}
}
this.year = year;
this.month = month;
this.day = day;
}
private boolean isLeapYear(int year) {
return (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0);
}
public int getYear() {
return year;
}
public int getMonth() {
return month;
}
public int getDay() {
return day;
}
}
```
上面的代码中,构造函数接受三个整数作为参数,然后验证月份和日期的有效性。如果日期无效,就抛出自定义的日期范围异常。isLeapYear()方法用于检查是否是闰年。
接下来是测试代码:
```java
public class DateTest {
public static void main(String[] args) {
// Invalid month
try {
Date date = new Date(2022, 13, 1);
} catch (DateRangeException e) {
System.out.println(e.getMessage());
}
// Invalid day in February
try {
Date date = new Date(2021, 2, 29);
} catch (DateRangeException e) {
System.out.println(e.getMessage());
}
// Invalid day in non-leap year February
try {
Date date = new Date(2022, 2, 29);
} catch (DateRangeException e) {
System.out.println(e.getMessage());
}
// Invalid day in month 4
try {
Date date = new Date(2022, 4, 31);
} catch (DateRangeException e) {
System.out.println(e.getMessage());
}
// Valid date
try {
Date date = new Date(2022, 1, 1);
System.out.println(date.getYear() + "-" + date.getMonth() + "-" + date.getDay());
} catch (DateRangeException e) {
System.out.println(e.getMessage());
}
}
}
```
上面的测试代码尝试创建不同的日期示例,包括无效的月份和日期,以及有效的日期。如果日期无效,则会捕获DateRangeException并打印错误消息。如果日期有效,则会打印日期的年份、月份和日期。