java8Stream流使用方式

问题如图
1：写上了数据结构，可直接写，
2：要用stream 流实现

public void testTest(){
        Map<String,String> objectObjectHashMap = new HashMap<>();
        objectObjectHashMap.put("id","1");
        objectObjectHashMap.put("contract_id","1");
        objectObjectHashMap.put("repay_at","65");
        objectObjectHashMap.put("plan_total_price","36");
        Map<String,String> objectObjectHashMap1 = new HashMap<>();
        objectObjectHashMap.put("id","6");
        objectObjectHashMap.put("contract_id","1");
        objectObjectHashMap.put("repay_at","98");
        objectObjectHashMap.put("plan_total_price","54");
        Map<String,String> objectObjectHashMap2 = new HashMap<>();
        objectObjectHashMap.put("id","44");
        objectObjectHashMap.put("contract_id","2");
        objectObjectHashMap.put("repay_at","87");
        objectObjectHashMap.put("plan_total_price","36");
        Map<String,String> objectObjectHashMap3 = new HashMap<>();
        objectObjectHashMap.put("id","8");
        objectObjectHashMap.put("contract_id","2");
        objectObjectHashMap.put("repay_at","35");
        objectObjectHashMap.put("plan_total_price","21");
        List<Map<String,String>> list = new ArrayList<>();
        list.add(objectObjectHashMap);
        list.add(objectObjectHashMap1);
        list.add(objectObjectHashMap2);
        list.add(objectObjectHashMap3);

    }

// 排序
System.out.println("------------------------------------------");
Stream tmp6 = list.stream();
tmp6.sorted((x, y) -> {
return x.compareTo(y);
}).forEach(System.out::println);

    tmp6.close();

// 分组，根据条件分组
Stream tmp10 = Arrays.asList(1, 1, 2, 3, 5).stream();
Map> groupMap = tmp10.collect(Collectors.groupingBy((x) -> x));

先分组，再排序一点点试呗