Add string representation of a LinkedHashMap<String,String>

Question

I have a String that has been constructed from another LinkedHashMap using toString method, and I want to do the reverse in creating another LinkedHashMap<String, String> with this String representation of the previous LinkedHashMap.

Is it possible withing using String splits and manually doing it in a loop calling LinkedHashMap.put() ?

I think this could work?

LinkedHashMap params = new LinkedHashMap();

String[] split = paramsString2.split(",");

for (int i = 0; i < split.length; i++) {
    String[] nameValue = split[i].split("=");
    params.put(nameValue[0], nameValue[1]);

}

return params;

I think yes, why not. You just have to write a convert method. — Andrew Logvinov
– Andrew Logvinov, Commented Oct 28, 2013 at 10:27
It would help if you provide a sample string that was constructed from the Map. — Sadek Noureddine
– Sadek Noureddine, Commented Oct 28, 2013 at 10:29
It works with LinkedHashMap, as the order is preserved and you will end up with same LinkedHashMap when converted from the string. If it was HashMap, I think that you might end up with a different map. — Sadek Noureddine
– Sadek Noureddine, Commented Oct 28, 2013 at 10:35
I think there is no standard approach to reconstruct the map from the string returned by toString (other than approach you have given). What is your use case? Can't you just serialize the map and deserialize it later? — Vincent van der Weele
– Vincent van der Weele, Commented Oct 28, 2013 at 10:35

Chris Mantle · Accepted Answer · 2013-10-28 14:46:00Z

1

Assume the string is of the form

key1=value1;key2=value2;key3=value3

Yes, it is possible. Use string.split(";") to separate the map entries into an array.

Then loop through the array, and for each entry, use string.split("=") to separate the key from the value.

Then add the key and value to the new LinkedHashMap:

String[] parts = entry.split("=");
map.put(parts[0], parts[1]);   //parts[0] is the key, parts[1] is the value

edited Oct 28, 2013 at 14:46

Chris Mantle

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answered Oct 28, 2013 at 10:30

NickJ

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2 Comments

Jono Over a year ago

Yea the string looks like that

Ernest Friedman-Hill Over a year ago

Note, though, that semicolons or equals signs in keys or values won't be escaped, so some maps won't be convertible.

Zarathustra · Accepted Answer · 2013-10-28 10:29:05Z

0

Sure it is possible, but why should you do such horrible stuff?

Anyway, yes it is possible, you could also use the guava library to accomplish such a job. guava-library

answered Oct 28, 2013 at 10:29

Zarathustra

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2 Comments

Jono Over a year ago

Because in Android, when you pass a serializable LinkedHashMap thats in order, it messes it up and converts it to a HashMap :(

Zavior Over a year ago

It wouldn't hurt to add that to the question!

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