Converting an Array to a Collection

Here is the illustration for the conversion from the an array to a collection. In this section, you will learn how how to do this. The given example gives you a brief introduction for converting an array to collection without losing any data or element held by the array.

This program creates an array, that contains all the elements entered by you. This array is converted into a list (collection). Every value for the separate subscript of the array will be converted as elements of the list (collection).

Code Description:

Arrays.asList(name):
Above code converts an array to a collection. This method takes the name of the array as a parameter which has to be converted.

for(String li: list):
This is the for-each loop. There are two arguments mentioned in the loop. In which, first is the String type variable li another one is the list name which has to be converted. This loop check each and every elements of the list and store it into the mentioned variable li.

Here is the code of the program:


import java.util.*;

import java.io.*;



public class ArrayToCollection{

  public static void main(String args[]) throws IOException{

    BufferedReader in = new BufferedReader(new InputStreamReader(System.in));

    System.out.print("How many elements you want to add to the array: ");

    int n = Integer.parseInt(in.readLine());

    String[] name = new String[n];

    for(int i = 0; i < n; i++){

      name[i] = in.readLine();

    }

    List<String> list = Arrays.asList(name); //Array to Collection

    for(String li: list){

      String str = li;

      System.out.print(str + " ");

    }

  }

}

Current Comments

2 comments so far (post your own) View All Comments Latest 10 Comments:

THANK FOR YOUR PROGRAM

Posted by Ronanldo on Monday, 10.13.08 @ 07:10am | #81033

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/*
* Created on Jun 18, 2008
*
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*/
package www.in;

/**
* @author mobilejava005
*
* To change the template for this generated type comment go to
* Window>Preferences>Java>Code Generation>Code and Comments
*/
import java.util.*;

public class CollectionToArray{
public static void main(String[] args){
List list = new ArrayList();
list.add("This ");
list.add("is ");
list.add("a ");
list.add("good ");
list.add("boy.");
// Iterator it=list.iterator();
// while(it.hasNext())
// {
// System.out.println(it.next());
// }
Object [] s1=list.toArray();
for(int i=0;i<s1.length;i++)
{
String contents=s1[i].toString();
System.out.println(contents);

}

}
}

Posted by sivakumar.kasa on Wednesday, 06.18.08 @ 14:20pm | #63709

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