Question

i 需要看到我的蒸气钥匙和价值,以便检查它是否正常工作。但对以下各行将产生错误:

Iterator iterator =  myHashMap.keySet().iterator();
    Flows flows = new Flows();
    while(iterator.hasNext()){
        Object key = iterator.next();
        Object value = myHashMap.get(key); // <--
        //here is the error.  suspicious call to java.util.Map.get 
        //expected type Flows, actual type object

        System.out.println(key+" "+value);
    }

我的关键是流动类型,我的价值是流动统计。

Answer 1

如果您宣布“<>Map为Map<Flows, flowssStatics>,你将自动退回班流物。

while(iterator.hasNext()){
    Flows key = iterator.next();
    FlowsStatics value = myHashMap.get(key);

Answer 2

您是否用一种通用的类型宣布了我的HashMap:例如HashimMap<Flows, 流程统计学;?

如果是的话,你应在整个过程中使用通用物:

Iterator<Flows> iterator =  myHashMap.keySet().iterator();
while(iterator.hasNext()){
    Flows key = iterator.next();
    FlowStatics value = myHashMap.get(key); // <--

甚至:

for(Flows key: myHashMap.keySet().iterator()){
    FlowStatics value = myHashMap.get(key);

甚至:

for(Map.Entry<Flows, FlowStatics> entry: myHashMap.entrySet().iterator()){
    Flows key = entry.getKey();
    FlowStatics value = entry.getValue();

友情链接