（JAVA）【实例】按照日期对List进行排序

package com.msxf.vcard.utils;

import com.msxf.eyas.ccsv.dto.resp.VirtualCardStmtListQueryResponse;
import org.apache.commons.lang3.time.DateUtils;

import java.text.ParseException;
import java.util.Comparator;
import java.util.Date;

/**
* Created by yang.jin on 26/12/2016.
*/
public class StmtCalendarComparator implements Comparator{
@Override
public int compare(Object o1, Object o2) {
VirtualCardStmtListQueryResponse.S32050StmtDetails p1 = (VirtualCardStmtListQueryResponse.S32050StmtDetails) o1;
VirtualCardStmtListQueryResponse.S32050StmtDetails p2 = (VirtualCardStmtListQueryResponse.S32050StmtDetails) o1;
Date d1 = null;
Date d2 = null;
try {
if (p1.getTxn_date() == null || p2.getTxn_date() == null) {
return 0;
} else {
d1 = DateUtils.parseDate(p1.getTxn_date(), "yyyy-MM-dd");
d2 = DateUtils.parseDate(p2.getTxn_date(), "yyyy-MM-dd");
}
} catch (ParseException e) {
e.printStackTrace();
return 0;
}
int result =  d1.before(d2) ? 1 : -1;
return  result;
}

}

Collections.sort(stmtDetails,new StmtCalendarComparator());
vcardVO.setStmtDetails(stmtDetails);