观察以下Java编程语言所述的类。公共类文档进程扩展了对象{私有字符串文档;私人int分类;公共文档流程(字符串Documer,int分类){if(分类<1)投掷新的Illegarguexception(“文档分类必须至少为1。“); this.docnumer = sagumer; this.classification = classification;} public string getDocnumer(){return gagu;} public int int getClassification(){返回分类; this.dochnumero =政府;分类,int优先级){super(sagging,分类); 1;