merging-meeting-times.java

import java.util.*;

public class MyApp {
 
    protected List<Integer[]> meetings = new ArrayList<>();
    
    public MyApp() {
        meetings.add(new Integer[] { 3, 5});
        meetings.add(new Integer[] { 0, 1});
        meetings.add(new Integer[] { 4, 8});
        meetings.add(new Integer[] { 10, 12});
        meetings.add(new Integer[] { 9, 10});
    }
    
    public void sortAsc() {
        Collections.sort(meetings, new Comparator<Integer[]>() {
            @Override
            public int compare(Integer[] i1, Integer[] i2) {
            	return i1[0].compareTo(i2[0]);
            }
        });
    }
    
    public Integer[] get(final int index) {
    	return meetings.get(index);   
    }
    
    public List<Integer[]> eliminateOverlaps() {
        final List<Integer[]> noOverlapList = new ArrayList<>();
        Integer[] lastMeeting = null;
        for (Integer[] meeting : meetings) {
            if (lastMeeting == null) {
            	lastMeeting = meeting;
                continue;
            }
            
            if (doMeetingsOverlap(lastMeeting, meeting)) {
                lastMeeting = mergeMeetings(lastMeeting, meeting);   
            } else {
            	noOverlapList.add(lastMeeting);
                lastMeeting = meeting;
            }
        }
        noOverlapList.add(lastMeeting);
        return noOverlapList;
    }
    
    public boolean doMeetingsOverlap(final Integer[] meeting1, final Integer[] meeting2) {
        return meeting1[1] >= meeting2[0];
    }
    
    public Integer[] mergeMeetings(final Integer[] meeting1, final Integer[] meeting2) {
        return new Integer[] { meeting1[0], meeting2[1]};
    }
    
    public static void printMeetings(final List<Integer[]> meetings) {
        System.out.print("[");
        for (Integer[] meeting : meetings) {
            System.out.print(meetingToString(meeting));
        }
        System.out.print("]");
    }
    
    public static String meetingToString(final Integer[] meeting) {
        return "(" + meeting[0] + "," + meeting[1] + ")";
    }
    
    public static void main(String[] args) {
        MyApp app = new MyApp();
        app.sortAsc();
        printMeetings(app.eliminateOverlaps());
    }
}

Kinda sloppy... But it works!