Your *compareTo()* is causing the runtime error.
More specifically, your *compareTo()* does not satisfy the requirement.
check out
https://docs.oracle.com/javase/7/docs/api/java/lang/Comparable.html
For example, given two identical interval A and B
*compareTo(A, B)* should be *0* instead of *1*
A correct implementation of *compareTo()* is attached for your reference.
*@Override*
*public int compareTo(Interval o) {*
* if (this.time < o.time) {*
* return -1;*
* } else if (this.time > o.time) {*
* return 1;*
* } else if (this.isEnd && !o.isEnd) {*
* return -1;*
* } else if (!this.isEnd && o.isEnd) {*
* return 1;*
* } else {*
* return 0;*
* }*
*}*
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