public static <T> Map<String, T> json2map

/**
* json string convert to map with javaBean
*/
public static <T> Map<String, T> json2map(String jsonStr, Class<T> clazz) throws Exception {
Map<String, Map<String, Object>> map = objectMapper.readValue(jsonStr, new TypeReference<Map<String, T>>() {
});
Map<String, T> result = new HashMap<String, T>();
for (Entry<String, Map<String, Object>> entry : map.entrySet()) {
result.put(entry.getKey(), map2pojo(entry.getValue(), clazz));
}
return result;
}

上面的<T>怎么理解？

必须要有前面的<T>，这样后面的T才能确定是泛型，还是叫T的类