Interval scheduling - does this IF statement check for overlapping?

[javaMed]

Hello,

The following if statement is supposed to check to see if the given values overlap (in any way):

if( ((st1 < st2)&&(st2 < fin1)) ||  ((st1 < fin2)&&(fin2 < fin1)) )

st1, st2 --> starting time
fin1, fin2 --> finishing time

I was supposed to go off of the following given by my teacher:
"things overlap if (starti < startj < finishi) or (starti < finishj < finishi)"

Could anyone please help me figure out why it always returns false??


Thanks in advance!