Programs based on Vector

1)Program to implement a Vector that accepts five items from the command line and store them in a Vector and display the objects stored in a Vector.

Code:

           import java.util.*;

           class Vectordemo

           {

         public static void main(String args[])

         {

       Vector v=new Vector();

       for(int i=0;i<=5;i++)

       {

     try

     {

   v.addElement(args[i]);

     }

     catch(Exception e)

     {}

       }

       Enumeration en=v.elements();

       System.out.println("\nElements in vector");

       while(en.hasMoreElements())

       {

     System.out.println(en.nextElement());

       }

         }

           }

Output:

           C:\Program Files\Java\jdk1.6.0_07\bin>javac Vectordemo.java

           C:\Program Files\Java\jdk1.6.0_07\bin>java Vectordemo 50 20 60 80 75

           Elements in vector

           50

           20

           60

           80

           75

2) Demo program for capacity() and contains() method of vector class.

Code:

          

import java.util.*;

class VectorDemo3

{

public static void main(String args[])

{

Vector vtr=new Vector(3,2);

System.out.println("Initial size="+vtr.size());

System.out.println("Initial Capacity="+vtr.capacity());

vtr.addElement(new Integer(1));

vtr.addElement(new Integer(2));

vtr.addElement(new Integer(3));

vtr.addElement(new Integer(4));

System.out.println("Capacity after 4 addition="+vtr.capacity());

vtr.addElement(new Double(5.45));

System.out.println("Capacity after 5 addition="+vtr.capacity());

vtr.addElement(new Double(6.08));

vtr.addElement(new Integer(7));

System.out.println("Capacity after 7 addition="+vtr.capacity());

vtr.addElement(new Float(9.4));

vtr.addElement(new Integer(10));

System.out.println("Capacity after 9 addition="+vtr.capacity());

vtr.addElement(new Integer(11));

vtr.addElement(new Integer(12));

System.out.println("First Element="+(Integer)vtr.firstElement());

System.out.println("Last Element="+(Integer)vtr.lastElement());

if(vtr.contains(new Integer(3)))

{

System.out.println("\n Vector contains 3");

}

System.out.println("\n Elements in Vector")

Enumeration e=vtr.elements();

while(e.hasMoreElements())

{

System.out.println(e.nextElement());

}

}

}

Output:

C:\Program Files\Java\jdk1.6.0_07\bin>javac VectorDemo3.java

C:\Program Files\Java\jdk1.6.0_07\bin>java VectorDemo3

Initial size=0

Initial Capacity=3

Capacity after 4 addition=5

Capacity after 5 addition=5

Capacity after 7 addition=7

Capacity after 9 addition=9

First Element=1

Last Element=12

Vector contains 3

Elements in Vector

1

2

3

4

5.45

6.08

7

9.4

10

11

12

3)Demo program for addElement() and insertElementat() of vector class and use of enumeration class.

Code:

          

import java.util.*;

class VectorDemo1

{

public static void main(String args[])

{

Vector V1=new Vector();

int len=args.length;

for(int i=0;i<=len;i++)

{

try

{

V1.addElement(args[i]);

}

catch(Exception e)

{}

}

V1.insertElementAt("COBOL",2);

Enumeration e=V1.elements();

while(e.hasMoreElements())

{

System.out.println(e.nextElement());

}

}

}

Output:

C:\Program Files\Java\jdk1.6.0_07\bin>javac VectorDemo1.java

C:\Program Files\Java\jdk1.6.0_07\bin>java VectorDemo1 Java C++ VisualBasic Pascal

Java

C++

COBOL

VisualBasic

Pascal

4) Demo program for addElement() and insertElementat() of vector class and use of iteration class.

Code:

          

import java.util.*;

class VectorDemo2

{

public static void main(String args[])

{

Vector V1=new Vector();

int len=args.length;

for(int i=0;i<=len;i++)

{

try

{

V1.addElement(args[i]);

}

catch(Exception e)

{}

}

V1.insertElementAt("COBOL",2);

Iterator itr=V1.iterator();

while(itr.hasNext())

{

System.out.println(itr.next());

}

}

}

Output:

C:\Program Files\Java\jdk1.6.0_07\bin>javac VectorDemo2.java

C:\Program Files\Java\jdk1.6.0_07\bin>java VectorDemo2 Java C++ VisualBasic Pascal

Java

C++

COBOL

VisualBasic

Pascal