How to check a timeperiod is overlapping another time period in java

Question

How to check a time period is overlapping another time period in the same day.

For example,

1. 7:00AM to 10:30AM is overlapping 10:00AM to 11:30AM

Answer 1

EDIT:

Here is the working method:

public boolean isOverlapping(Date start1, Date end1, Date start2, Date end2) {
    return start1.compareTo(end2) <= 0 && end1.compareTo(start2) >= 0;
}

And here is proof for everyone to try it:

@Test
public void isOverlapping_base() {
    Assert.assertTrue(isOverlapping(getDate(2014, 1, 1),
            getDate(2014, 3, 31), getDate(2014, 1, 2),
            getDate(2014, 4, 1)));
    
    Assert.assertTrue(isOverlapping(getDate(2014, 1, 2),
            getDate(2014, 4, 1), getDate(2014, 1, 1),
            getDate(2014, 3, 31)));
    
    Assert.assertTrue(isOverlapping(getDate(2014, 1, 1),
            getDate(2014, 4, 1), getDate(2014, 1, 2),
            getDate(2014, 3, 31)));
    
    Assert.assertTrue(isOverlapping(getDate(2014, 1, 2),
            getDate(2014, 3, 31), getDate(2014, 1, 1),
            getDate(2014, 4, 1)));
    
    Assert.assertFalse(isOverlapping(getDate(2014, 1, 1),
            getDate(2014, 1, 31), getDate(2014, 3, 1),
            getDate(2014, 3, 31)));
    
    Assert.assertFalse(isOverlapping(getDate(2014, 3, 1),
            getDate(2014, 3, 31), getDate(2014, 1, 1),
            getDate(2014, 1, 31)));
}

Date getDate(int year, int month, int date) {
    Calendar working = Calendar.getInstance();
    working.set(year, month - 1, date, 0, 0, 0); 
    working.set(Calendar.MILLISECOND, 0);
    return working.getTime();
}