如何在JAVAFX TABLEVIEW中选择特定的表索引

I want to select specific index in my e.g tableview.index(0).getSelectedItem(); something like this. I did it but I can only select the last row. something like selectLast(); quiet similar to what I wanna do. How to do that in javafx, I'm quiet beginner to this language hopefully I did point out what I'm trying to say.I want to select specific index in my e.g table