stream 分组 求最小值，字符串连接

public static void main(String[] arg){
    InsureOrg org1= new InsureOrg();
    org1.setOrgId("1");
    org1.setOrgName("江苏");
    org1.setAddress("中央路");
    org1.setRegisterTime("2000-10-01");
    org1.setOrgType("记录仪");

    InsureOrg org2= new InsureOrg();
    org2.setOrgId("1");
    org2.setOrgName("江苏");
    org2.setAddress("龙蟠路");
    org2.setRegisterTime("2000-10-02");
    org2.setOrgType("无人机");

    InsureOrg org3= new InsureOrg();
    org3.setOrgId("3");
    org3.setOrgName("浙江");
    org3.setAddress("南京路");
    org3.setRegisterTime("2000-10-04");
    org3.setOrgType("记录仪");

    InsureOrg org4= new InsureOrg();
    org4.setOrgId("3");
    org4.setOrgName("浙江");
    org4.setAddress("福建路");
    org4.setRegisterTime("2000-10-07");
    org4.setOrgType("记录仪");

    List<InsureOrg> list = new ArrayList();
    list.add(org1);
    list.add(org2);
    list.add(org3);
    list.add(org4);

    //使用stream的groupBy指定属性进行分组
    List<InsureOrg> result = new ArrayList();
    Map<String, List<InsureOrg>> map = list.stream().collect(Collectors.groupingBy(InsureOrg::getOrgId));
    for (String key : map.keySet()) {
        List<InsureOrg> value = map.get(key);
        InsureOrg  temp =new InsureOrg();
        temp.setOrgId(key);
        temp.setOrgName(value.get(0).orgName);
        Optional<String> minTime = value.stream().map(InsureOrg::getRegisterTime).min(String::compareTo);
        if(minTime.isPresent())
        temp.setRegisterTime(minTime.get());
        String address= value.stream().map(InsureOrg::getAddress).distinct().collect(Collectors.joining(", "));

        temp.setAddress(address);
        String type= value.stream().map(InsureOrg::getOrgType).distinct()
                .collect(Collectors.joining(", "));
        temp.setOrgType(type);
        result.add(temp);
    }

    System.out.println(result.size());

}