对list集合中的对象按照字段属性排序

Collections.sort(returnList,new CpmObDimNewComparator());/** * 新的维度排序 * * @author zhangjun * */class CpmObDimNewComparator implements Comparator {public int compare(Object element1, Object element2) {QualityMaintenanceForm s1 = (QualityMaintenanceForm) element1;QualityMaintenanceForm s2 = (QualityMaintenanceForm) element2;if(s1.getOrderid()==null || s2.getOrderid()==null){String d1 = s1.getStartdate();String d2 = s2.getStartdate(); String e1 = s1.getEnddate(); String e2 = s2.getEnddate();if(d1==null || d2==null){return -2;}if(d1.compareTo(d2) > 0){return 2;}else if(d1.compareTo(d2)==0){String t1 = s1.getTimeStr();String t2 = s2.getTimeStr();if(e1 == null || e2 == null){return -1;}if(e1.compareTo(e2)>0){return 1;}else if(e1.compareTo(e2) ==0){if(t1 == null || t2 == null){return -1;}if(t1.compareTo(t2) > 0){return 1;}else if(t1.compareTo(t2)==0){return 0;}else if(t1.compareTo(t2)<0) {return -1;}return 0;}else if(e1.compareTo(e2)<0){return -1;}return 0;}else if(d1.compareTo(d2)<0){return -2;}return -3;}int o1 = s1.getOrderid().intValue();int o2 = s2.getOrderid().intValue();String d1 = s1.getStartdate();String d2 = s2.getStartdate();String e1 = s1.getEnddate(); String e2 = s2.getEnddate();if (o1 > o2) {return 3;} else if (o1 == o2) {if(d1==null || d2==null){return -2;}if(d1.compareTo(d2) > 0){return 2;}else if(d1.compareTo(d2)==0){String t1 = s1.getTimeStr();String t2 = s2.getTimeStr();if(e1 == null || e2 == null){return -1;}if(e1.compareTo(e2)>0){return 1;}else if(e1.compareTo(e2) ==0){if(t1 == null || t2 == null){return -1;}if(t1.compareTo(t2) > 0){return 1;}else if(t1.compareTo(t2)==0){return 0;}else if(t1.compareTo(t2)<0) {return -1;}return 0;}else if(e1.compareTo(e2)<0){return -1;}return 0;}else if(d1.compareTo(d2)<0){return -2;}}return -3;}}