src/main/java/com/cedarsoftware/util/io/JsonObject.java
public boolean isCollection()
    {
        if (target instanceof Collection)
        {
            return true;
        }
        if (containsKey("@items") && !containsKey("@keys"))
        {
            return type != null && !type.contains("[");
        }
        return false;
    }
public boolean isCollection()
    {
        if (target instanceof Collection)
        {
            return true;
        }
        if (containsKey("@items") && !containsKey("@keys"))
        {
            return type != null && !type.contains("[");
        }
        return false;
    }
Collection APIs