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        Map<T, T> map = new HashMap<>();
        Set<T> set = new HashSet<>();
        List<T> list = new ArrayList<>();
        String[] arr = new String[3];
        
        // Map key => List
        new ArrayList<>(map.keySet());

        // Map value => List
        new ArrayList<>(map.values());

        // Map value => Set
        new HashSet<>(map.values());

        // Array => Set
        new HashSet<>(Arrays.asList(arr));

        // Array <= Set
        set.toArray(new T[set.size()]);

        // List => Set
        new HashSet<>(list);

        // List <= Set
        new ArrayList<>(set);

        // List => Array
        list.toArray(new T[list.size()]);

        // List <= Array
        new ArrayList<>(Arrays.asList(arr));