Error when trying to .clear() or .removeAllElements() in 2D vectors

Question

hi,
vectorA is the big vector and it contains a vectorB.
i will like to built a 2D vector. However it happens that when i try to use a vectorB.clear() or vectorB.removeAllElements(), so that i can push in elements again in a fresh vector. Nothing was pushed in.
is it that i haf to
vectorB = new Vector();
inorder to start a new element in vectorA ??
logic goes....
Vector vectorA = new Vector()
Vector vectorB = new Vector()
cnt = 1
//for(j = 1; j <3 ; j ++){
do{
vectorB.addElement(i);
cnt++;
}while(cnt<3)
vectorA.addElement(vectorB);
if i do this once , i can get
vector[0][0] = 1
vector[0][1] = 2
but if i add the commented statements, i get
vector[0][0] = 1
vector[0][1] = 2
vector[0][2] = 1
vector[0][3] = 2
vector[1][0] = 1
vector[1][1] = 2
vector[1][2] = 1
vector[1][3] = 2
do i declare vectorB in the do loop, that is create a new vector everytime or do i declare it globally?? thankz for the time pals.

Answer 1

try this
int cnt = 1;
for(int j = 1; j <3 ; j ++){
Vector vectorB = new Vector(2);
  for (int cnt = 1; cnt<3; cnt ++) {
    vectorB.addElement(i);
vectorA.addElement(vectorB);
}