Map and List are the two commonly used data structures
Here I am writing way to convert Map to List.
Basically Map holds two things are key and value on the other hand list holds only values.
Both Map and List allow duplicate data.

Below is the example:

public class MapToListConversion{ 

public static void main(String... args) { 
    HashMap<String, String> empMap = new HashMap<String, String>(); 
    empMap.put("emp name", "abc"); 
    empMap.put("emp id", "10022"); 
    empMap.put("emp designation", Software Engg"); 
    empMap.put("experience", "5 Years); 

    System.out.println("Size of Employee Map: " + empMap.size()); 

    List<String> testList = new ArrayList<String>( empMap.keySet()); 
    System.out.println("Size of test List keys : " + testList.size()); 

    List<String> testListValues = new ArrayList<String>( empMap.values()); 
    System.out.println("Size of list values: " + testListValues.size()); 

} 

} 

O/P:
Size of Employee Map: 4
Size of test List keys : 4
Size of list values: 4