Vector
An Vector is like an array ,which can grow in memory dynamically.it
means that we can store elements into the Vector,depending on the
number of elements,the memory is dynamically allotted and re-allotted
accommodate all the elements.
- Duplicate objects are allowed
- Insertion order preserved
- Heterogeneous objects are allowed
- Null insertion is possible
- Vector is synchronized
.this means that when more than one thread acts simultaneously on the Vector object,the results will be reliable
Vector constructor:
Vector v=new Vector(); creates an empty Vector object with default initial capacity 10.
if Vector reaches max capacity then a new Vector object will be with
new capacity=(current capacity*2)
Vector v=new Vector(int initialcapacity);creates an empty Vector object with initial capacity
Vector v=new Vector(Collection c);creates an equivalent Vector object with the given collection.
Vector Example:
import java.util.Vector;
import java.util.Enumeration;
public class Edemo {
public static void main(String[] args) {
//create a Vector object
Vector v = new Vector();
//populate the Vector
v.add("One");
v.add("Two");
v.add("Three");
v.add("Four");
/Get Enumeration of Vector's elements using elements() methodEnumeration e = v.elements();
/*
Enumeration provides two methods to enumerate through the elements.
It's "hasMoreElements()" method returns true if there are more elements to
enumerate through otherwise it returns false. Its" nextElement() "method returns
the next element in enumeration.
*/
System.out.println("Elements of the Vector are : ");
while(e.hasMoreElements()){
System.out.println(e.nextElement());
}
}
}
Elements of the Vector are :
One
Two
Three
Four
