xsd生成的java对象里的list成员变量没有set函数

例如：

生成的java对象里只有get函数：

/**
     * Gets the value of the networks property.
     * 
     * 

     * This accessor method returns a reference to the live list,
     * not a snapshot. Therefore any modification you make to the
     * returned list will be present inside the JAXB object.
     * This is why there is not a set method for the networks property.
     * 
     * 

     * For example, to add a new item, do as follows:
     * 
     *    getNetworks().add(newItem);
     * 
     * 
     * 
     * 

     * Objects of the following type(s) are allowed in the list
     * {@link Network }
     * 
     * 
     */
    public List getNetworks() {
        if (networks == null) {
            networks = new ArrayList();
        }
        return this.networks;
    }

没有set函数，但是正如get函数的注释所示，使用方法是通过

getNetworks().add(newItem);