How to change a collection to an array using Java

Problem Description

How to change a collection to an array?

Solution

Following example shows how to convert a collection to an array by using list.add() and list.toArray() method of Java Util class.

import java.util.*;

public class CollectionToArray{
   public static void main(String[] args){
      List<String> list = new ArrayList<String>();
      list.add("This "); 
      list.add("is "); 
      list.add("a ");
      list.add("good ");
      list.add("program.");
      String[] s1 = list.toArray(new String[0]); 
      
      for(int i = 0; i< s1.length; ++i) {
         String contents = s1[i];
         System.out.print(contents);
      } 
   }
}

Result

The above code sample will produce the following result.

This is a good program.