Draw a single-linked list of Integer objects containing the integers 5, 10, 7 and 30 and referenced by head. Complete the following fragment, which adds all Integer objects in a list. Your fragment should walk down the list, adding all integer values to sum.       int sum = 0;       Node nodeRef = --------;       while (nodeRef != null) {     int next = ---------- ;    sum += next;     nodeRef = ----------- ;       }

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