錯誤代碼如下：

            for (int i=0;i< rows.size();i++) {Row r = rows.get(i);if (r.equals(row)) {assertTrue(rows.contains(row));return;}}

cassertTrue(rows.contains(row));返回了false，看起來很奇怪，此時equals 定義如下：

    public boolean equals(Row row) {if (this.className.equals(row.className)  && this.relationship.equals(row.relationship) &&this.superClassName.equals(row.superClassName)) {return true;}return false;}

debug 發現 list進行contains 判定使用的的 equals 是object 類的equals

將 equals 改為

@Overridepublic boolean equals(Object obj) {if (obj instanceof Row) {Row row = (Row) obj;if (this.className.equals(row.className) && this.relationship.equals(row.relationship)&& this.superClassName.equals(row.superClassName)) {return true;}}return false;}

即equals的入參應該是Object。