Java Calendar處理日期范圍重疊的情況

可以使用Java Calendar類來處理日期范圍重疊的情況。以下是一個示例代碼，可以用來檢查兩個日期范圍是否重疊：

import java.util.Calendar;

public class DateRangeOverlap {
    
    public static boolean isOverlap(Calendar start1, Calendar end1, Calendar start2, Calendar end2) {
        return start1.before(end2) && start2.before(end1);
    }

    public static void main(String[] args) {
        Calendar start1 = Calendar.getInstance();
        Calendar end1 = Calendar.getInstance();
        Calendar start2 = Calendar.getInstance();
        Calendar end2 = Calendar.getInstance();
        
        start1.set(2021, 0, 1); // January 1, 2021
        end1.set(2021, 0, 10); // January 10, 2021
        
        start2.set(2021, 0, 5); // January 5, 2021
        end2.set(2021, 0, 15); // January 15, 2021
        
        if(isOverlap(start1, end1, start2, end2)) {
            System.out.println("Date ranges overlap");
        } else {
            System.out.println("Date ranges do not overlap");
        }
    }
}

在上面的示例中，我們首先定義了兩個日期范圍，start1到end1和start2到end2。然后我們調用isOverlap方法來檢查這兩個日期范圍是否重疊。如果它們重疊，則輸出“Date ranges overlap”，否則輸出“Date ranges do not overlap”。

通過使用Calendar類，我們可以方便地比較兩個日期范圍是否重疊。如果我們需要處理更復雜的日期范圍重疊情況，可以根據具體要求進行擴展和修改。