String s1 = "A";
		String s2 = "B";
		String s3 = "C";
		String s4 = "D";
		String s5 = "E";
		String s6 = "X";
		Vector v = new Vector();
		v.add(s1);
		v.add(s2);
		v.add(s3);
		v.add(s4);
		v.add(s5);
		for (ListIterator iter = v.listIterator(); iter.hasNext();) {
			String element = (String) iter.next();
			if (element.equalsIgnoreCase("B")){
				iter.add(s6);
			}
		}
		for (Iterator iter = v.iterator(); iter.hasNext();) {
			String element = (String) iter.next();
			System.out.println(element);
		}


Ergebnis:
A
B
X
C
D
E