setDataVector - javax.swing.Table

i had a situation where i had to use this setDataVector function. I was puzzled to see there was an extra second argume开发者_如何学运维nt(Vector columnIdentifiers) in the function. I'm just resetting the data. Why do i need to send the column identifiers?? And it doesn't take the old column identifiers by default if i don't pass the second argument. Irritating to add initialize a vector with column identifiers only for this purpose. Any idea why it's been done like that?

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From the actual code, it looks to me like the method could have been better named. Something like setDataAndColumns() makes more sense. The internal code looks like this:

    this.dataVector = nonNullVector(dataVector);
    this.columnIdentifiers = nonNullVector(columnIdentifiers);

Passing in null for columnIdentifiers will simply remove all the columns in the table. I guess your controller class needs to keep a copy of the columnIdentifiers to pass in as required.

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The setDataVector(...) method is invoked by all the constructor methods which require you to include both parameters.