Convert Collection to Array

In this section, you will learn to convert Collection data to an Array.

Code Description:

This program helps you in converting Collection data to an Array. Here we have taken an collection of weekdays which gets converted to Array using days.toArray method.


import java.util.*;

import java.io.*;

import java.util.ArrayList;

import java.util.Collection;



public class CollToArr {

  public static void main(String args[]) {

  String weekdays[] = { "Sunday", "Monday", "Tuesday", "Wednesday",

 "Thursday","Friday", "Saturday"};

  Collection<String> days = new ArrayList<String>();

  for (int i = 0, n = weekdays.length; i < n; i++) {

  days.add(weekdays[i]);

  }

  String s[] = (String[])days.toArray(new String[0]);

  for (int i = 0, n = s.length; i < n; i++) {

  System.out.println(s[i]);

  }

  }

}

Output of the program:

C:\unique>javac CollToArr.java

C:\unique>java CollToArr
Sunday
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday

C:\unique>

Download this example.

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