简书链接:invokevirtualv6v7xxx的举例
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invoke-virtual {v6, v7}, Ljava/lang/StringBuilder;->append(Ljava/lang/String;)Ljava/lang/StringBuilder;
转换为java代码为

v6.append(v7);
具体参考调试截图

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new-instance v6, Ljava/lang/StringBuilder;

   invoke-direct {v6}, Ljava/lang/StringBuilder;-><init>()V

   const-string v7, "RecordThread doRecord: "

   invoke-virtual {v6, v7}, Ljava/lang/StringBuilder;->append(Ljava/lang/String;)Ljava/lang/StringBuilder;

   move-result-object v6

image.png