Java sql execute with more variable

I have a frame with 50 label, i can select them, for example i select A1,A2,A3,A4 the program save these in string (String=A1;A2;A3;A4) and i want to call in this query


   String sql= "UPDATE Teremszekek SET Állapot='Foglalt' where Terem='1' and Szék='A1' and DKód='1' ";  

         PreparedStatement pst=conn.prepareStatement(sql);
        }catch(Exception e){


Állapot=condition(available,unavailable) Terem=room(index of room) Szék=chair DKód=Date code

How can i write that if i choose, A1,A2,A3,A4 etc label then it paste to query

//i select them at the same time


If I understand your question in the right way, this should be your solution:

String sql= "UPDATE Teremszekek SET Állapot='Foglalt' where Terem='1' and Szék=? and DKód='1' ";  

pst.setString(1, yourValue);

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