In autoore , a novel approach to extract java semantic relational model is presented . to get precise object relational result , the java code polymorphism invoke location is formal defined and a program analysis method based on extended class hierarchy graph ( echg ) is proposed 代碼抽取是oore的起點,從起點開始支持理解是逆向工程的重要目標, autoore在java抽取中,抽取模型采用文中提出的java詞法和語義兩個模型,利用一個基于java擴展類層次圖( echg )的多態調用點分析算法,得到更精確的靜態對象關系。