判斷兩個時間段是否重疊

背景

分配工作任務、或者項目申報中，日期相關的一般會有開始時間(startTime)，結束時間(endTime)。

有時候需要確認兩條數據的時間跨度是否有重疊。

import java.time.LocalDate;

public class TestDuration {
    public static void main(String[] args) {
        String startTime = "2020-04-13";
        String endTime = "2020-07-20";

        String [] testCase = new String[] {
                "2020-04-13","2020-07-20",
                "2020-04-12","2020-07-20",
                "2020-04-12","2020-07-19",
                "2020-04-13","2020-07-20",
                "2020-07-20","2020-07-25",
                "2020-07-19","2020-07-25",
                "2020-01-12","2020-04-13",
                "2020-04-13","2020-04-13",
                //不重復
                "2020-07-21","2020-07-21",
                "2020-07-21","2020-07-25",
                "2020-01-01","2020-04-12"
        };

        for (int i = 0; i < testCase.length; i+=2) {
            boolean matched = match(startTime, endTime, testCase[i], testCase[i + 1]);
            System.out.println("重復申報:"+matched);
        }
    }


    static boolean match(String projectStartTime1, String projectEndTime1,String projectStartTime2,String projectEndTime2)
    {
        LocalDate startTime1 = formatDate(projectStartTime1);
        LocalDate endTime1 = formatDate(projectEndTime1);

        LocalDate startTime2 =formatDate(projectStartTime2);
        LocalDate endTime2 = formatDate(projectEndTime2);
        return !(startTime2.isAfter(endTime1)||startTime1.isAfter(endTime2));
    }
}

public static LocalDate formatDate(String date) {
        return LocalDate.parse(date);
    }

 

   public boolean checkDuplicateApply(Project project)
    {
        Date startTime = project.getProjectStartTime();
        Date endTime = project.getProjectEndTime();

        List<Project> projects = projectMapper.queryList(Collections.singletonMap("projectName",project.getProjectName()));
        for (Project thisProject : projects) {
            if(match(startTime,endTime,thisProject.getProjectStartTime(),thisProject.getProjectEndTime()))
            {
                return false;
            }
        }
        return true;
    }

    private static boolean match(Date projectStartTime1, Date projectEndTime1,Date projectStartTime2,Date projectEndTime2)
    {
        return !(projectStartTime2.after(projectEndTime1)||projectStartTime1.after(projectEndTime2));
    }