[unchecked] 未经检查的转换警告

代码如下：

 @Test
    public void testMonitorInfo(){
        Connection connection = alarmService.conn("121.40.157.200", "deploy", "deploy");
       Map<Alarm.AlarmType,Object> map = alarmService.minitorResult(connection);
        Double cpuInfo =(Double)map.get(Alarm.AlarmType.CPU);
        System.out.println("cpuInfo:"+cpuInfo);
        Double memInfo =(Double)map.get(Alarm.AlarmType.MEM);
        System.out.println("memInfo:"+memInfo);
        Map<String,Double> disInfo = (Map<String,Double>)map.get(Alarm.AlarmType.DISK);
        System.out.println("disInfo:" + disInfo);

        Assert.assertEquals(1,1);
    }

报警告
E:\BriAir\src\test\java\com\hp\briair\AlarmServiceTest.java:43: 警告: [unchecked] 未经检查的转换
Map<String,Double> disInfo = (Map<String,Double>)map.get(Alarm.AlarmType.DISK);
需要: Map
找到: Object
1 个警告
从警告代码来看map已经用泛型约束了(Map)map，请问是什么原因导致该警告？