Vector in Java

Vector in Java

It is one of the Legacy Collection framework class. Vector class object organizes the data in the form of cells. Creating a Vector is nothing but creating an object of Vector class.

Vector v=new Vector();

Vector Important Points

• The default capacity of the Vector v=10 cells
• Vector are Synchronized.
• Vector uses Enumeration interface to traverse the elements. It can be use Iterator also.
• Vector is one of the Legacy Collection framework class.
• Vector class object organizes the data in the form of cells.
• The default size of the Vector=0 (size is nothing but number of values available in the cells)
• In Vector cell values are storing in Heap Memory and cell address are storing in associative memory.

Constructor of vector

• Vector(): Vector() is used for creating an object of Vector without specifying any number of cells to be created.
• Vector(int): Vector(int) is used for creating an object for Vector class by specifying number of cells to be created.

Methods of Vector

• public int capacity(): are used for find the capacity of Vector.
• public int size(): are used for find size of Vector class object.
• public void addElement(Object): are used for adding the elements to the Vector one-by-one.
• public void addElementAt(int.Object): are used for adding the elements to the Vector at specific existing position.
• public Object removeElementAt(int): are used for removing the elements of Vector on the basics of the position.
• public void removeElement(Object): are used for removing the elements of Vector on the basics of content.
• public Enumeration elements(): are used for extracting all the elements of Vector class object

Vector v=new Vector();
System.out.println("capacity of v="+v.capacity()); // 10
System.out.println("size of v="+v.size());               // 0
v.addElement(10);
v.addElement(10.75f);
System.out.println(v);      // [10,10.75]
v.addElementAt(1,'A');
System.out.println(v);    // [10,A,10.75]
Object obj=v.removeElementAt(1);
System.out.println(obj);                        // A
v.removeElement('A');
System.out.println(v);    // [10,10.75]

import java.util.*;

class VectorDemo
{
 public static void main(String [] args)
 {
 Vector v=new Vector();

// Add data to v
v.addElement("Deo");
v.addElement("Smith");
v.addElement("Karter");
v.addElement("Porter");

// Extract the data
  Enumeration e=v.elements();  
  while(e.hasMoreElements()){  
  System.out.println(e.nextElement());  
  }  
 }
}

Deo
Smith
Karter
Porter