map合并，相同键对应的值相加

public class CombineMap {
public static Map<Integer,Integer> addTo(Map<Integer,Integer> target, HashMap<Integer,Integer>plus) {
    Object[] os = plus.keySet().toArray();
    Integer key;
    for (int i=; i<os.length; i++) {
        key = (Integer)os[i];
        if (target.containsKey(key)) 
            target.put(key, target.get(key) + plus.get(key));
        else
            target.put(key, plus.get(key));
    }
    return target;
}

public static void main(String[] args) {
            // 获得arm,body,head,leg,wst
            // ......
    Map<Integer,BigDecimal> all = new TreeMap<Integer,BigDecimal>();
      all.put(, new BigDecimal());
      all.put(, new BigDecimal());
      all.put(, new BigDecimal());
      all.put(, new BigDecimal());
      all.put(, new BigDecimal());
    
      Map<Integer,BigDecimal> plus = new HashMap<Integer,BigDecimal>();
      plus.put(, new BigDecimal());
      plus.put(, new BigDecimal());
      plus.put(, new BigDecimal());
      plus.put(, new BigDecimal());
      plus.put(, new BigDecimal());
    
      all = addTo(all, plus);
      all = addTo(all, plus);
      List<BigDecimal> tepList;
      tepList = new ArrayList<BigDecimal>();
      for (Object s : all.keySet()) {
          System.out.print("year : " + s);
          System.out.println("  values : " + all.get(s).doubleValue());
          tepList.add(all.get(s));
      }
}
}