SEGGER Embedded Studio IDE移植FreeRTOS

Map<String,Object> map = new HashMap<>();
        map.put("name","张三");
        map.put("age","30");
        map.put("sex","男");
        map.put("addr","深圳");
        List<Map<String,Object>> list = new ArrayList<>();
        list.add(map);
        map = new HashMap<>();
        map.put("name","李四");
        map.put("age","31");
        map.put("sex","男");
        map.put("addr","北京");
        list.add(map);
        map = new HashMap<>();
        map.put("name","王五");
        map.put("age","35");
        map.put("sex","男");
        map.put("addr","深圳");
        list.add(map);
        // 根据addr住址分组
        Map<String, List<Map<String, Object>>> addr = list.stream().collect(Collectors.groupingBy(m -> MapUtils.getString(m, "addr")));
        System.out.println("分组"+addr);
        // 遍历分组后的数据
        addr.forEach((k,v)->{

            System.out.println("map中的key:"+k);
            v.forEach((kk)->{
                System.out.println("listMap中的数据"+kk);
            });
        });

        // 过滤,保留匹配的数据
        List<Map<String, Object>> mapStream = list.stream().filter(m -> MapUtils.getString(m, "addr").equals("深圳")).collect(Collectors.toList());
        System.out.println("过滤："+mapStream);
        // 过滤，第一条匹配的数据
        Optional<Map<String, Object>> first = list.stream().filter(m -> MapUtils.getString(m, "addr").equals("深圳")).findFirst();
        System.out.println("过滤："+first);

        // 去重
        List<String> collect = list.stream().map(m -> MapUtils.getString(m, "addr")).distinct().collect(Collectors.toList());
        System.out.println("去重"+collect);

        // 升序
        List<Map<String, Object>> sort1 = list.stream().sorted(Comparator.comparing(m -> MapUtils.getString(m, "age"))).collect(Collectors.toList());
        System.out.println("升序"+sort1);
        // 降序
        List<Map<String, Object>> sort2 = list.stream().sorted(Comparator.comparing(m -> MapUtils.getString((Map) m, "age")).reversed()).collect(Collectors.toList());
        System.out.println("降序:"+sort2);

        //创建城市
        List<String> cityList = new ArrayList<String>();
        cityList.add("北京；上海；深圳；");
        cityList.add("广州；武汉；杭州；");

        // 将数据按照逗号分割组成完整的字符串
        String collect1 = cityList.stream().map(c -> c.split("；")).flatMap(Arrays::stream).collect(Collectors.joining(","));
        System.out.println("将数据按照逗号分割组成完整的字符串"+collect1);

 输出结果：