Nested vectors problem

Question

Hi,
I'm having a bit of a problem trying to create a vector within a vector. I am parsing a string and adding the elements to a vector. Then after I've done this I want to add the newly populated vector to another vector, then clear the original vector and start again. Thus adding "rows" and "columns" to create a 2D array as a vector.
However, my problem comes when I try to clear the first vector after I've added it's contents to the containing vector. When I call the clear(); function it does clear the vector, but it also clears it from containing vector I've just added it to! Surely this can't be right? What's the way around this?
String rows = "";
Vector vCols = new Vector();
Vector vRows = new Vector(vCols);
// Split on rows
StringTokenizer stRows = new StringTokenizer(rows, "][");
//while rows remaining, put contents in vector
while (stRows.hasMoreTokens()) {
//split on ']['
//clearing this also remove the contents already put into vRows !!
vCols.clear();
rows = stRows.nextToken(); // contains A row!
StringTokenizer stCols = new StringTokenizer(rows, ",");
          //now parse the columns
while (stCols.hasMoreTokens()) {
String d = stCols.nextToken();
vCols.addElement(d);
vRows.addElement(vCols);
TIA
~PAul Phillips

Answer 1

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You can't just 'clear' a Vector and and more data to it you need to create a new Vector for every row. This thread shows a similiar example on creating a Vector of Vectors from a ResultSet from an SQL query:
http://forum.java.sun.com/thread.jsp?forum=57&thread=497641