将hashmap转换为stringarray [英] converting hashmap to stringarray
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问题描述
我试图将一个hashmap转换成一个数组,我可以放入一个创建的字符串数组。然而我得到java.lang。我将我的drinkar.keySet()。toArray()转换为String [],但它仍然不起作用。
public String [] receiveArrayList(){
String [] list = new String [0] ;
尝试{
ois = new ObjectInputStream(socket.getInputStream());
drinkar =(HashMap< String,ArrayList< String>>)(ois.readObject());
System.out.println(drinkar);
System.out.println(Arrays.toString(drinkar.keySet()。toArray()));
list =(String [])(drinkar.keySet()。toArray());
for(int i = 0; i< list.length; i ++){
System.out.println(list);
}
} catch(ClassNotFoundException ex){
System.out.println(ex);
} catch(IOException ex){
System.out.println(ex);
}
返回列表;
解决方案 drinkar.keySet()。toArray()
返回 Object []
not String []
$ b
其中一种可能是:
$ b $ p Collections.toArray(StringArry)
(或)
遍历 keySet
并将每个元素添加到数组中。
I am trying to convert a hashmap into an array, that I can put in a created string array. I however get java.lang. I have typeconverted my drinkar.keySet().toArray() to String[], but it will still not work.
public String[] receiveArrayList(){
String[] list = new String[0];
try {
ois = new ObjectInputStream(socket.getInputStream());
drinkar = (HashMap<String, ArrayList<String>>) (ois.readObject());
System.out.println(drinkar);
System.out.println(Arrays.toString(drinkar.keySet().toArray()));
list = (String[]) (drinkar.keySet().toArray());
for(int i = 0; i < list.length; i++){
System.out.println(list);
}
} catch (ClassNotFoundException ex) {
System.out.println(ex);
} catch (IOException ex) {
System.out.println(ex);
}
return list;
}
解决方案 drinkar.keySet().toArray()
returns Object[]
not String[]
One of the way may be:
user Collections.toArray(StringArry)
(or)
Iterate through the keySet
and add each element to array.
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