In Java, Data structures, known as collection classes or collections framework, is a big topic as it involves many many classes. Choosing a right data structure, in Java, requires good experience and once chosen, writing part, a novice can do. DS is simple in Java because of no pointers. In this tutorial list iterator is …
After practicing Enumeration and Iterator with examples, let us summarize the differences. Both Enumeration and Iterator are used for iterating elements of a data structure. Iterator, being latest, comes with more features tabulated below. Enumeration Iterator Introduced with JDK 1.0 Introduced with JDK 1.2 Cannot remove any elements Can remove elements from the original DS …
Java Iterator Interface Example: JDK 1.0 Enumeration is replaced by Iterator interface in JDK 1.2. Being latest, it comes with many advantages over Enumeration. Like Enumeration, Java Iterator interface is also used for iterating the elements. Java Iterator Interface Example import java.util.*; public class IteratorDemo { public static void main(String args[]) { Vector vect1 = …
We have seen earlier iterating Vector elements with Enumeration and Iterator. Now let us see with ListIterator. ListIterator is derived from Iterator interface and comes with more methods than Iterator. Always, subclass is richer than super class. Following is the class signature public interface ListIterator extends Iterator We know between two interfaces extends should be …
As the new Java versions are released, the coding becomes easier and Java becomes more robust language to practice, For example JDK 1.5 introduced a new for loop with which iteration of elements of arrays and data structures becomes easier. Start reading this tutorial on "Arrays Enhanced for loop". Java for loop is modified (enhanced) …
This is the second tutorial on the enhanced for loop on collections. Earlier one is with arrays – Arrays Enhanced for loop (foreach). Collections Enhanced new for loop Observe the following program. import java.util.ArrayList; public class ForEachCollections { public static void main(String args[]) { // enhanced for loop with generics Integer array list ArrayList al1 …
Enumeration Interface Example: Enumeration interface is from java.util package. It was introduced with JDK 1.0. It is used by many data structures especially with legacy classes. The DS of JDK 1.0 are known as legacy classes. They are Stack, Vector, Hashtable and Properties. Enumeration Interface Example import java.util.*; public class EnumerationDemo { public static void …
You have seen the iteration of elements in the following examples earlier. 1. Using Enumeration interface. 2. Using Iterator interface. 3. Using ListIterator interface. Also you have seen the analogy of Enumeration vs Iterator. Differences between Enumeration, Iterator and ListIterator are very confusing for a Beginner. Understandability increases when placed at a single place. Towards …
