在 Java 中迭代 MultiMap

Question

I have a multimap like below:

map = {config1=[abc, xyz], config2=[abc]}

Now I try to iterate it using the following piece of code

Iterator<Entry<String, Object>> itr = map.entrySet().iterator();
          while(itr.hasNext()) { 
              Entry<String, Object> entry = itr.next();
              System.out.println("Key = " + entry.getKey() + ", Value = " + entry.getValue()); 
              }

I am getting the output as:

Key = config1, Value = [abc, xyz]
Key = config2, Value = [abc]

but I need the output as:

Key = config1
Value = abc
Value = xyz
Key = config2
Value = abc

How can I achieve this?

Answer 1

I can suggest something like this

public static void main(String[] args) {
    Map<String, Object> map = new HashMap<>();
    String[] arr1 = {"abc", "xyz"};
    String[] arr2 = {"abc"};
    map.put("config1", arr1);
    map.put("config2", arr2);

    Iterator<Map.Entry<String, Object>> itr = map.entrySet().iterator();
    while(itr.hasNext()) {
        Map.Entry<String, Object> entry = itr.next();
        System.out.println("entry.getKey() = " + entry.getKey());
        for (Object object: (Object[]) entry.getValue()) {
            System.out.println("object = " + object);
        }
    }
}

Then output will look like

entry.getKey() = config2
object = abc
entry.getKey() = config1
object = abc
object = xyz

The key action this is casting String[] to Object[] .