public static void main(String[] args) {
        List<Map<String, String>> objects = new ArrayList<>();
        Map<String, String> map = new HashMap<>();
        map.put("C_CONT_ID","123");
        map.put("c_Ri_Com","456");

        Map<String, String> map1 = new HashMap<>();
        map1.put("C_CONT_ID","123");
        map1.put("c_Ri_Com","789");

        Map<String, String> map2 = new HashMap<>();
        map2.put("C_CONT_ID","1111");
        map2.put("c_Ri_Com","456");

        Map<String, String> map3 = new HashMap<>();
        map3.put("C_CONT_ID","ooooo");
        map3.put("c_Ri_Com","ppppp");

        Map<String, String> map4 = new HashMap<>();
        map4.put("C_CONT_ID","123");
        map4.put("c_Ri_Com","456");

        objects.add(map);
        objects.add(map1);
        objects.add(map2);
        objects.add(map3);
        objects.add(map4);

        System.out.println(objects.toString());
        List<Map<String, String>> distinctMaps = objects.parallelStream().distinct()
                .collect(Collectors.toList());
        System.out.println(distinctMaps.toString());

    }

运行 查看结果

去重前 ： [{c_Ri_Com=456, C_CONT_ID=123}, {c_Ri_Com=789, C_CONT_ID=123}, {c_Ri_Com=456, C_CONT_ID=1111}, {c_Ri_Com=ppppp, C_CONT_ID=ooooo}, {c_Ri_Com=456, C_CONT_ID=123}]
去重后 ： [{c_Ri_Com=456, C_CONT_ID=123}, {c_Ri_Com=789, C_CONT_ID=123}, {c_Ri_Com=456, C_CONT_ID=1111}, {c_Ri_Com=ppppp, C_CONT_ID=ooooo}]