Array to Collection
In this example we are converting values of an array into
collection.
List interface is a member of the Java Collection
Framework and extends Collection interface. List
interface is an ordered collection which follows insertion order, typically allow duplicate
elements. The List interface provides a special iterator, called ListIterator
for insertion, replacement and bi-directional access.
The Arrays class contains various methods for manipulating arrays
(e.g. sorting and searching etc.) and extends the Object class. The Iterator class allows access
to the elements of a collection.
Methods used:
hasNext(): This method is used to get more elements. If the element at the next
position is found
then returns true otherwise throws an exception.
next(): This method returns the next element in the iteration.
asList(Object[] a): This method acts as a bridge between array and collection. This method
converts array into Arrays by internally using Colletion.toArray() method
.
The code of the program is given below:
import java.util.Arrays;
import java.util.List;
import java.util.Iterator;
public class ArraysToCollection{
public static void main(String[] args){
String[] array = {"Java", "Struts", "JSP", "J2EE"};
List list = Arrays.asList(array);
Iterator iterator = list.iterator();
System.out.println("\nThe values into Array");
while (iterator.hasNext()){
System.out.println((String) iterator.next());
}
}
}
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The output of the program is given below:
C:\rajesh\kodejava>javac ArraysToCollection.java
C:\rajesh\kodejava>java ArraysToCollection
The values into Array
Java
Struts
JSP
J2EE
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