使用import com.google.common.collect.Maps;如何优化这段代码

Z时代
2024-01-10
分类：技术分享

private void setBearCapacityData(List<List> bearCapacityList, Map<String, Object> data) {
        //System.out.println("bearCapacityList = " + bearCapacityList);
        List<Double> cupPercentageList = new ArrayList<>();
        List<Double> storagePercentageList = new ArrayList<>();
        List<Double> diskPercentageList = new ArrayList<>();
        Map<String,Object> useableMaps = Maps.newHashMap();
        Map<String,Object> useableMaps1 = Maps.newHashMap();
        Map<String,Object> useableMaps2 = Maps.newHashMap();
        List<Map<String,Object>> useableDataList = Lists.newArrayList();
        for (Object object0: bearCapacityList.get(0)) {
            CpuUseable cpuUseable = (CpuUseable)object0;
            cupPercentageList.add(cpuUseable.getPercentage());
        }
        useableMaps.put("name","cpu可用率");
        useableMaps.put("percentage", cupPercentageList);
        useableDataList.add(useableMaps);
        for (Object object1: bearCapacityList.get(1)) {
            StorageUseable storageUseable = (StorageUseable)object1;
            storagePercentageList.add(storageUseable.getPercentage());
        }
        useableMaps1.put("name","内存可用率");
        useableMaps1.put("percentage", storagePercentageList);
        useableDataList.add(useableMaps1);
        for (Object object2: bearCapacityList.get(2)) {
            DiskUseable diskUseable = (DiskUseable)object2;
            diskPercentageList.add(diskUseable.getPercentage());
        }
        useableMaps2.put("name","磁盘可用率");
        useableMaps2.put("percentage", diskPercentageList);
        useableDataList.add(useableMaps2);
        data.put("bearCapacityData", useableDataList);    }

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回答：

String[] names = new String[] {"cpu可用率", "内存可用率", "磁盘可用率"};
List<Map<String,Object>> useableDataList = Lists.newArrayList();
for (int i = 0; i < names.length; i++) {
    Map<String, Object> map = Maps.newHashMap();
    List<Double> list = new ArrayList<>();
    for (Object obj : bearCapacityList.get(i)) {
        Method method = obj.getClass().getMethod("getPercentage");
        // 加个强转呗
        list.add((Double) method.invoke(obj));
    }
    // 下边这两句我记得好像是可以用 
    // Maps.of("name", names[i], "percentage", list);
    // 来写，但是我忘了谷歌这个包还有没有这个接口了。
    map.put("name", names[i]);
    map.put("percentage", list);
    // 这里写错了，应该是 useableDataList 
    useableDataList .add(map);}