vector to String

[Maria Krishna]

Hi there,
when i converted a vector to a string array using toArray, i had a classCastException, How do I convert a vector to String object
thanks in advance
Maria

[Wayne L Johnson]

As long as you are assured that every element in the vector is a String, try this:

import java.util.Vector;
       
Vector vec = new Vector();
vec.addElement("one");
vec.addElement("two");
String[] blah = (String[])vec.toArray(new String[0]);
System.out.println("blah: " + blah[0] + " ... " + blah[1]);

The "toArray()" method in Vector is overloaded; if you don't call the correct one it will only return an array of Object. If you want to cast it to some other type, you have to pass in a "seed" array of that type. As shown in this example, it can have a length of zero.
[ November 07, 2003: Message edited by: Wayne L Johnson ]

[Joe Ess]

However, if you are not assured that every object is a String, you will have to iterate through the Vector and invoke toString() on each of the Vector's elements (adapting the previous example):

 
Vector vec = new Vector();
vec.addElement(new Integer(1));
vec.addElement(new Integer(2));
StringBuffer sb = new StringBuffer();
Iterator i = vec.iterator();
boolean first = true;
while(i.hasNext()){
   if (first){
      first = false;
   } else {
      sb.append(", ");
   } 
   sb.append(i.next().toString());   
}
System.out.println(sb.toString());
   }