How to convert array to collection in java?

**Steadfast** · 06-02-2010

Hello to all,
I am new to this forum. I am last year Computer Science student. I recently started learning java language. In our last lecture our sir asked one question how to convert array to collection in java? No one is able to give answer, that's why I am asking this question on this forum. Can anyone able to give answer of this question with proper example.
Thank you.

**absolute55** · 06-02-2010

Hey it is very easy process to convert array to collection in java. You have to just use java.util.Arrays class to do this. We are bale to converts array into collection using static method asList(Object[] a) which is present in java.util.Arrays class. Just try to understand it. It is very simple. In this program I have use java.util.List class to convert array to collection.

Code:

import java.util.Arrays;
import java.util.List;
import java.util.Iterator;

public class ArraystocolleEg
{
    public static void main(String[] args)
    {
        String[] array1 = {"Welcome", "to", "this", "world"};
        List list1 = Arrays.asList(array1);

        Iterator iterators = list1.iterator();
        while (iterators.hasNext())
        {
            System.out.println((String) iterators.next());
        }
    }
}

**Katty** · 06-02-2010

It is very simple to convert array to collection in java. In have written follwing code for you to convert array to collection in java. You have to just use this code in your program for converting array to collection. In the following program I have create one array variable to store user value and after that I have pass this variable to Arrays.asList() method for converting array to collection.

Code:

Object[] arrays1 = new Object[]{"98","32","54"};
java.util.List lists = Arrays.asList(arrays1);

**kelfro** · 06-02-2010

I have written following program in java to convert array to collection. It is very simple program. You have to just use java.util. to do this. You can do this by using "import java.util.*;" value. In the following program I also have use java.io.* class to import input and output methods.

Code:

import java.util.*;
import java.io.*;
import java.util.ArrayList;
import java.util.Collection;

public class CollToArrEG {
  public static void main(String args[]) {
    String allweekdays[] = { "Sundays", "Mondays", "Tuesdays", "Wednesdays",
 "Thursdays","Fridays", "Saturdays"};
    Collection<String> dayss = new ArrayLists<String>();
  for (int k = 0, p = weekdays.length; k < p; k++) {
    days.add(weekdays[k]);
    }
    String sp[] = (String[])dayss.toArray(new String[0]);
    for (int k = 0, p = sp.length; k < p; k++) {
      System.out.println(s[k]);
      }
      }
}

**Zecho** · 06-02-2010

You can convert array to collection using following java program. It is very simple program. In the following program I have use java.util.Arrays class to accept array variable and I have also use java.util.Collections class to convert array to collection. In the following program I have create one class known as "arrSort" and using this class I have create one object of it for storing all array variable.

Code:

import java.util.Arrays;
import java.util.Collections;
import java.util.List;

public class arrSort {
  public static void main(String args[]) {
    String[] strArrays = new String[] { "Java", "is", "very", "simple",
        "and", "easy" , "language" };

    List k = Arrays.asList(strArrays);
    Collections.arrsort(k);
    System.out.println(k);
  }
}