import java.util.Vector;
...
class myVector {
	void method() throws IOException {
		String	str;
		Vector	vector;

		RandomAccessFile fp = new RandomAccessFile("/etc/passwd", "r");
		vector = new Vector(10, 5);

		while ((str = fp.readLine()) != null) {
			vector.addElement(str);

		System.out.println("Size: " + vector.size());
		System.out.println("Cap:  " + vector.capacity());
		
		str = (String) vector.elementAt(1);
		vector.setElementAt(str, 4);

		System.out.println(vector);
	}
}