Problem : Create a dynamic vector that can add any number of elements of any object.
Program :Step 1 - CodingCreate a text file c:\sunilos\TestVector.java and copy below contents.import java.util.*; /* * A program to implement Vector. */ public class TestVector { public static void main(String[] args) { Vector v = new Vector(); // You can insert any object in the Vector. Here it is string v.add("Jay"); v.add("Viru"); v.add("Basanti"); // Return type of get() method is Object. Object o = v.get(0); /* You can insert any object in the Vector. Here it is Integer * Primitive data type need to be converted into Objects before * inserting. */ Integer i = new Integer(5); v.add(i); // Type cast your object in desired Class Integer value = (Integer) v.get(3); System.out.println("Value of Index # 3 = " + value); // Get all elements and print System.out.println("Print All Elements with help of For loop "); for (int j = 0; j < v.size(); j++) { System.out.println(j + " : " + v.get(j)); } // Get all elements and print with help of Iterator interface Iterator it = v.iterator(); // Get an iterator System.out.println("Print All Elements with help of Iterator "); while (it.hasNext()) { // Checks if any element in list Object oo = it.next(); // Get next available element System.out.println(" From Iterator -- " + oo); } // Get all elements and print with help of Enumeration interface Enumeration e = v.elements(); // Get java.util.Enumeration objects System.out.println("Print All Elements with help of Enumeration "); while (e.hasMoreElements()) { // Checks if any element in list Object oo = e.nextElement(); // Get next available element System.out.println(" From Enumeration -- " + oo); } } } Step 2 - Deployment
Step 3 - Testing
OutputC:\sunilos>java TestVector Value of Index # 3 = 5 Print All Elements with help of For loop 0 : Jay 1 : Viru 2 : Basanti 3 : 5 Print All Elements with help of Iterator From Iterator -- Jay From Iterator -- Viru From Iterator -- Basanti From Iterator -- 5 Print All Elements with help of Enumeration From Enumeration -- Jay From Enumeration -- Viru From Enumeration -- Basanti From Enumeration -- 5 FAQWhat is Vector?TheVector class is a dynamic growable array of
objects. Elements can be
accessed using an integer index. However, the size of a
Vector can grow or shrink as needed to accommodate
adding and removing items after the Vector has been created.As of the Java 2 platform v1.2, this class has been retrofitted to implement List, so that it becomes a part of Java's collection framework. Vector is synchronized. Vector can be instantiated with some initial capacity and increment value. Vector(int initialCapacity) Constructs an empty vector with the specified initial capacity and with its capacity increment equal to zero. Vector(int initialCapacity, int capacityIncrement) Constructs an empty vector with the specified initial capacity and capacity increment. What is difference between ArrayList and Vector?
What is an Iterator?Just
like iteration, it reads data sequentially from collection objects.
An
iterator over a collection. Iterator takes the place of Enumeration in
the Java collections framework. Iterators differ from enumerations in two ways: i. Iterators allow the caller to remove elements from the underlying collection during the iteration with well-defined semantics. ii. Method names have been improved. In other words Iterator can remove an element whereas Enumeration can not. Most Interesting methods in Vector?
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