如何将相似代码段提取成公共方法

 1 // 判断日期类型
 2 boolean flagDate = false;
 3 if (CollectionUtils.isNotEmpty(ruleVO.getDateTypeList())) {
 4     for (DateTypeVO dateTypeVO : ruleVO.getDateTypeList()) {
 5         if (dateTypeVO.getSelected()) {
 6             flagDate = true;
 7             break;
 8         }
 9     }
10 }
11 if (!flagDate) {
12     throw new BusinessException("日期类型不能为空");
13 }
14 // 判断服务车组
15 boolean flagCar = false;
16 if (CollectionUtils.isNotEmpty(ruleVO.getCarGroupList())) {
17     for (CarGroupVO carGroupVO : ruleVO.getCarGroupList()) {
18         if (carGroupVO.getSelected()) {
19             flagCar = true;
20             break;
21         }
22     }
23 }
24 if (!flagCar) {
25     throw new BusinessException("服务车组不能为空");
26 }

 1 public class DateTypeVO {
 2     /**
 3      * 日期类型编号
 4      */
 5     private String code;
 6     /**
 7      * 日期类型名称
 8      */
 9     private String name;
10     /**
11      * 是否选中
12      */
13     private Boolean selected;
14 }

public class CarGroupVO {
    /**
     * 车组id
     */
    private Integer groupId;
    /**
     * 车组名称
     */
    private String groupName;
    /**
     * 是否选中
     */
    private Boolean selected;
}

public interface ISelectVo {
    Boolean getSelected();
}

    public <T extends ISelectVo> void checkIsSelected(List<T> list, String msg) throws BusinessException {
        boolean flagItem = false;
        if (CollectionUtils.isNotEmpty(list)) {
            for (T itemVO : list) {
                if (itemVO.getSelected()) {
                    flagItem = true;
                    break;
                }
            }
        }
        if (!flagItem) {
            throw new BusinessException(msg);
        }
    }

    public <T extends BaseDomain> void setModifyInfo(T object) {
        object.setModifyEmp(Long.valueOf(AuthorityUtils.getUserId()));
        object.setModifyEmpName(AuthorityUtils.getUserName());
        object.setModifyTime(new Date());
        object.setCreateEmp(Long.valueOf(AuthorityUtils.getUserId()));
        object.setCreateEmpName(AuthorityUtils.getUserName());
        object.setCreateTime(new Date());
    }