Get the highest version number for the id from linked hashmap in java

Question

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I have a linked hashmap which contains these values:

```
LinkedHashMap<String,String> map= new LinkedHashMap<>();
map.put("A101","2020_1.0");
map.put("A101","2020_3.0");
map.put("A101","2020_2.0");
map.put("A102","2020_2.0");
map.put("A102","2020_1.0");
```

I need to get:
A101 2020_3.0 and
A102 2020_2.0

What I have tried:

not able to solve. Tried substring, replaceall method but not able to do. need help

Posted 19-Oct-21 21:34pm

Sachin Singh 2021

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Comments

Richard MacCutchan 20-Oct-21 4:51am

You cannot use the same Key for multiple values. If you list the entries of your map you will find only a single entry for each of your keys.

Sachin Singh 2021 20-Oct-21 6:56am

ArrayList<string,string> list= new ArrayList<>();
list.put("A101","2020_1.0");
list.put("A101","2020_3.0");
list.put("A101","2020_2.0");
list.put("A102","2020_2.0");
list.put("A102","2020_1.0");

Now how can i get A101 2020_3.0 and A102 2020_2.0

Richard MacCutchan 20-Oct-21 7:28am

You will need to search for the items that match your requirements.

Sachin Singh 2021 20-Oct-21 8:12am

can you let the logic for that?

Richard MacCutchan 20-Oct-21 8:24am

I have no idea what the basic problem is, or how you will decide which items to search for. Where does the information come from that you use to build your lists? Where does the information come from that you use to decide which items to search for? It may be that a simple array list is not the best collection type to solve your problem.

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