Best way to change TreeMap value?

Hello,
I am wondering what is the best way to change a value in a TreeMap? I have retrieved a value by .get on the key i.e.
String aString = (TreeMap) aTreeMap.get(aKey);but would now like to change aString and ?.put? it back into the map?
How would I do this?
Thank you,
Poot.

but would now like to change aString and ?.put? it
back into the map?Do I just have to keep a note on the (key,value) - especially key - change the value and then .put(key,value) back in? Though I'll need to remove the initial pairing if I do this since TreeMap won't allow duplicate keys!
There must be an easier way as this.
Thank you for your reply,
Regards,
Poot.

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                   WHEN a.ord_min_start     >     ADD_MONTHS(SYSDATE,-36)
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    ABC-123    0130 Z211      .5 12 mos. back
    ABC-123    0170 X928      .0 12 mos. back
    ABC-123    0324 Y000      .1 12 mos. back
    ABC-123    0120 H214      .3 24 mos. back
    ABC-123    0122 T203     2.5 24 mos. back
    ABC-123    0130 Z211      .5 24 mos. back
    ABC-123    0170 X928      .0 24 mos. back
    ABC-123    0324 Y000      .1 24 mos. back
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