It's not clear to me what the comment means, and you have two branches that are 
equal. Maybe rewrite to:

```
                        else if (args[i].startsWith("--") || 
args[i].startsWith("-")) {
                                // the argument cannot be a negative number 
because we checked earlier
                                // -> the next argument is a parameter name
                                map.put(key, NO_VALUE_KEY);
                        }
```

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