Copy a Map Object in Java

Tried to follow the same way as in <How do I copy an object in Java?>.

But it does not work with Map object in the following codes. I want to copy the original map data to currMap. The current outputs are -

0 1 2 3 null null null

I want it to be - 0 1 2 3 0 2 3

What are missing here?

Thanks

import java.util.ArrayDeque;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Queue;

class mapCopy{
    private Map<Character, Queue<Integer>> map;
    mapCopy(Map<Character, Queue<Integer>> map){
        this.map=map;
    }
    
    mapCopy(mapCopy mapcopy){
        this.map=mapcopy.map;
    }
    
    Map<Character, Queue<Integer>> getMap(){
        return this.map;
    }
}

public class Test {

    static Map<Character, Queue<Integer>> BuildMap(){
        String toMatch="able";
        Map<Character, Queue<Integer>> map = new HashMap<>();
        
        int i=0;
        for(var c:toMatch.toCharArray()) {
            Queue<Integer> q = map.get(c);
            if(q==null)
                q=new ArrayDeque<Integer>();
            
            q.add(i);
            map.put(c, q);          
            i++;
        }
        
        return map;
    }
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Map<Character, Queue<Integer>> map = BuildMap();
        
        List<String> dic = Arrays.asList("able", "ale");        
                        
        for(var d:dic) {
            var copy1 = new mapCopy(map);
            var copy2 = new mapCopy(copy1);
            
            var currMap = copy2.getMap();
            
            for(var c:d.toCharArray()) {        
                    System.out.println(currMap.get(c).poll());
            }
        }
    }

}

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