Java代码——计算两个HashMap的余弦相似度

Map map = new HashMap();
　　Iterator iter = map.entrySet().iterator();
　　while (iter.hasNext()) {
　　   Map.Entry entry = (Map.Entry) iter.next();
　　   Object key = entry.getKey();
　　   Object val = entry.getValue();
　　}

public class Similarity {
public static float computeSim(HashMap<String,Float> map1,HashMap<String,Float> map2){
float result = 0;
Iterator iter1 = map1.entrySet().iterator();
Iterator iter2 = map2.entrySet().iterator();
Float sum1 = (float) 0;
Float sum2 = (float) 0;
Float sum3 = (float) 0;
Float v1,v2;
while(iter2.hasNext()){
Entry entry = (Entry) iter2.next();
v2 = (Float) entry.getValue();
sum2+=v2*v2;
}
String key;
while(iter1.hasNext()){
Entry entry = (Entry) iter1.next();
v1 = (Float) entry.getValue();
key = (String) entry.getKey();
sum1 += v1*v1;
if(map2.containsKey(key)){
v2 = map2.get(key);
sum3 += v1*v2;
}
}
result = sum3/(sum1+sum2);
return result;
}
}