Vector Example in java
In this example we are going to show the use of
java.util.Vector class. We will be creating an object of Vector class and
performs various operation like adding, removing etc. Vector class extends AbstractList and implements
List, RandomAccess, Cloneable, Serializable. The size of a vector
increase and decrease according to the program. Vector is synchronized.
In this example we are using seven methods of a Vector
class.
add(Object o): It adds the element in the end of
the Vector
size(): It gives the number of element in the
vector.
elementAt(int index): It returns the element at
the specified index.
firstElement(): It returns the first element of
the vector.
lastElement(): It returns last element.
removeElementAt(int index): It deletes the
element from the given index.
elements(): It returns an enumeration of the
element
In this example we have also used Enumeration
interface to retrieve the value of a vector. Enumeration interface
has two methods.
hasMoreElements(): It checks if this enumeration
contains more elements or not.
nextElement(): It checks the next element of the
enumeration.
Code of this program is given below:
//java.util.Vector and java.util.Enumeration;
import java.util.*;
public class VectorDemo{
public static void main(String[] args){
Vector<Object> vector = new Vector<Object>();
int primitiveType = 10;
Integer wrapperType = new Integer(20);
String str = "tapan joshi";
vector.add(primitiveType);
vector.add(wrapperType);
vector.add(str);
vector.add(2, new Integer(30));
System.out.println("the elements of vector: " + vector);
System.out.println("The size of vector are: " + vector.size());
System.out.println("The elements at position 2 is: " + vector.elementAt(2));
System.out.println("The first element of vector is: " + vector.firstElement());
System.out.println("The last element of vector is: " + vector.lastElement());
vector.removeElementAt(2);
Enumeration e=vector.elements();
System.out.println("The elements of vector: " + vector);
while(e.hasMoreElements()){
System.out.println("The elements are: " + e.nextElement());
}
}
}
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Output of this example is given below:
C:\Java Tutorial>javac VectorDemo.java
C:\Java Tutorial>java VectorDemo
the elements of vector: [10, 20, 30, tapan joshi]
The size of vector are: 4
The elements at position 2 is: 30
The first element of vector is: 10
The last element of vector is: tapan joshi
The elements of vector: [10, 20, tapan joshi]
The elements are: 10
The elements are: 20
The elements are: tapan joshi
C:\Java Tutorial>_
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