也許我們可以嘗試不同的方法。
第一： 方法 compareDates 通過格式化日期來丟棄時間。
public class EqualityDates {
public static void main(String[] args) throws ParseException {
System.out.println(compareDates(10,0,2019).equals(compareDates(1,0,2019)));
}
private static Date compareDates(int day, int month, int year) throws ParseException {
MyDate myDate = new MyDate();
DateFormat formatter = new SimpleDateFormat("dd/MM/yyyy");
Calendar cal = Calendar.getInstance();
cal.set(Calendar.DAY_OF_MONTH, day);
cal.set(Calendar.MONTH, month);
cal.set(Calendar.YEAR, year);
myDate.setMyDate(formatter.parse(formatter.format(cal.getTime())));
return myDate.getMyDate();
}
}
然后： MyDate 類覆蓋 Equals 和 HashCode 來比較日期。
class MyDate {
Date myDate;
public Date getMyDate() {
return myDate;
}
public void setMyDate(Date myDate) {
this.myDate = myDate;
}
@Override
public boolean equals(Object obj) {
if (this == obj) return true;
if (obj == null) return false;
if (getClass() != obj.getClass()) return false;
MyDate otherDate = (MyDate) obj;
if (myDate == null) {
if (otherDate.myDate != null) return false;
} else if (!myDate.equals(otherDate.myDate)) return false;
return true;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((myDate == null) ? 0 : myDate.hashCode());
return result;
}
}
這只是一個嘗試！
