public class PointCalculate {

  public HashMap<String, Float> calPoint;
  private static PointCalculate instance;

  private PointCalculate(){
     calPoint = new HashMap<String, Float>();
  }

  public static PointCalculate getInstance(){
     if(instance==null){
        instance = new PointCalculate();
     }
     return instance;
  }

  public void calculatePoint(String uid ,float point){

     Float ps = instance.calPoint.get(uid);
     if(ps==null) {
        ps = point;
        instance.calPoint.put(uid, ps);
     }
     else {
        ps = point+ps.floatValue();
        instance.calPoint.put(uid, ps);
     }
  }
}

public class Exp {

     public void setpoint(){
        PointCalculate obj = PointCalculate.getInstance();
        obj.calculatePoint(rowkey, point);//rowkey and point come from file.....
     }
  }

public static void main(String args[]) throws Exception {
     PointCalculate obj = PointCalculate.getInstance();
     SqlInsertPoint.givePoint(obj.calPoint);
  }