Meeting Rooms

Given an array of meeting time intervals consisting of start and end times [[s1,e1],[s2,e2],...] (si < ei), determine if a person could attend all meetings.

For example,
Given [[0, 30],[5, 10],[15, 20]],
return false.

Sort

public boolean canAttendMeetings(Interval[] intervals) {
        if(intervals.length<2) return true;
        Arrays.sort(intervals, (Interval i1, Interval i2) -> i1.start - i2.start);
        for(int i=1;i<intervals.length;i++){
            if(intervals[i].start<intervals[i-1].end)
                return false;
        }
        return true;
    }