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Updating Opportunity record

I am trying to write a java code in which whenever any new partners are added into Opportunity it will be merged in the new field called Partners merge filed. "Partner merge filed" is custom filed which I have already created. So now I am trying to check when ever new partners are added in the opportunity, this code will update that "partners merge filed" and  append the new partners  to the existing partners in the "partners merge field". Can anyone help me with these. I would really appreciate this.
Thanks a lot!!!