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How To Convert Array to ArrayList

Rajkumar
March 16, 2018

Let’s see some sample programs on how to convert Array to ArrayList

Sample Program 1:

package classFiveArrays;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;

public class ConvertArrayToArrayList {
	
	public static void main (String [] args){
		
		//Using asList
		String[] students = {"Raj", "Kumar", "Rajkumar"};
		
		ArrayList<String> arrList = new ArrayList<>(Arrays.asList(students));
		
		arrList.add("Ramesh");
		arrList.add("Bala");
		
		System.out.println(arrList);
		
		System.out.println(arrList.get(2));
		
	}

}

package classFiveArrays;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.Collections;

public class ConvertArrayToArrayList {

public static void main (String [] args){

//Using asList

String[] students = {"Raj", "Kumar", "Rajkumar"};

ArrayList<String> arrList = new ArrayList<>(Arrays.asList(students));

arrList.add("Ramesh");

arrList.add("Bala");

System.out.println(arrList);

System.out.println(arrList.get(2));

}

Output:

[Raj, Kumar, Rajkumar, Ramesh, Bala]
Rajkumar
[Raj, Kumar, Rajkumar, Ramesh, Bala]

[Raj, Kumar, Rajkumar, Ramesh, Bala]

Rajkumar

[Raj, Kumar, Rajkumar, Ramesh, Bala]

Sample Program 2:

package classFiveArrays;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;

public class ConvertArrayToArrayList {
	
	public static void main (String [] args){
		
		//Using Collection.addAll
		String[] students = {"Raj", "Kumar", "Rajkumar"};
		
		ArrayList<String> arrList = new ArrayList<String>();
		
		Collections.addAll(arrList, students);
				
		arrList.add("Hello");
		
		System.out.println(arrList);
		
	}

}

package classFiveArrays;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.Collections;

public class ConvertArrayToArrayList {

public static void main (String [] args){

//Using Collection.addAll

String[] students = {"Raj", "Kumar", "Rajkumar"};

ArrayList<String> arrList = new ArrayList<String>();

Collections.addAll(arrList, students);

arrList.add("Hello");

System.out.println(arrList);

}

Output:

[Raj, Kumar, Rajkumar, Hello]

1	[Raj, Kumar, Rajkumar, Hello]

Sample Program 3:

package classFiveArrays;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;

public class ConvertArrayToArrayList {
	
	public static void main (String [] args){
		
	    ArrayList<String> arrList= new ArrayList<String>();
	    String array[] = {"Raj","Kumar","Rajkumar"};   

	    //array.length returns the current number of elements present in array
	    for(int i =0;i<array.length;i++)
            {
	    	//We are adding each array's element to the ArrayList
	    	arrList.add(array[i]);
	    }
	    
	    System.out.println(arrList);
	    
	    /*ArrayList content*/
	    for(String str: arrList)
	    {
	         System.out.println(str);
	    }
		
	}

}

package classFiveArrays;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.Collections;

public class ConvertArrayToArrayList {

public static void main (String [] args){

ArrayList<String> arrList= new ArrayList<String>();

String array[] = {"Raj","Kumar","Rajkumar"};

//array.length returns the current number of elements present in array

for(int i =0;i<array.length;i++)

{

//We are adding each array's element to the ArrayList

arrList.add(array[i]);

}

System.out.println(arrList);

/*ArrayList content*/

for(String str: arrList)

{

System.out.println(str);

}

Output:

[Raj, Kumar, Rajkumar]
Raj
Kumar
Rajkumar

[Raj, Kumar, Rajkumar]

Raj

Kumar

Rajkumar

Must Read: Java Tutorial

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Rajkumar SM is a founder of SoftwareTestingMaterial. He is a certified Software Test Engineer by profession and blogger & youtuber by choice. He has an extensive experience in the field of Software Testing. He writes here about Software Testing which includes both Manual and Automation Testing. He loves to be with his wife and cute little kid 'Freedom'.