Ordenamiento con comparator

StandaloneExamples.java

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package standaloneexamples;

import java.util.*;

/**
 *
 * @author USUARIO WINDOWS
 */
public class StandaloneExamples {

	/**
	 * @param args the command line arguments
	 */
	public static void main(String[] args) {
		List<DatoConCalendar> datos = new ArrayList<DatoConCalendar>();
		
		Collections.sort(datos, new Comparator<DatoConCalendar>(){
			@Override
			public int compare(DatoConCalendar o1, DatoConCalendar o2) {
				return o2.getCalendar().compareTo(o1.getCalendar());
			}
		});
	}
}

class DatoConCalendar {
	private Calendar calendar;

	public Calendar getCalendar() {
		return calendar;
	}

	public void setCalendar(Calendar calendar) {
		this.calendar = calendar;
	}
}