In this tutorial you will learn how to convert array to arraylist in Java.
There are mainly two ways to convert a Java array to arraylist.
- Using Arrays.asList() method
- Using Collections.addAll() method
Below I have shared an example of each of these methods. In these examples we are converting string array to arraylist.
Also Read: Convert ArrayList to Array in Java
Convert Array to ArrayList in Java
1. Using Arrays.asList() method
The asList() method of Arrays class directly converts an array to arraylist. It has following syntax.
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ArrayList<T> arrayList=new ArrayList<T>(Arrays.asList(array)); |
Example
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package com; import java.util.ArrayList; import java.util.Arrays; public class ArrayToArrayList { public static void main(String...s){ String str[]={"C","C++","Java","Android","JavaScript"}; //converting Array to ArrayList ArrayList<String> al=new ArrayList<String>(Arrays.asList(str)); for(int i=0;i<al.size();++i){ System.out.println(al.get(i)); } } } |
Output
C
C++
Java
Android
JavaScript
2. Using Collections.addAll() method
The addAll() method of Collections class can also be used for converting array to arraylist. It is faster than Arrays.asList() method. It has following syntax.
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Collections.addAll(arrayList,array); |
Example
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package com; import java.util.ArrayList; import java.util.Collections; public class ArrayToArrayList { public static void main(String...s){ String str[]={"C","C++","Java","Android","JavaScript"}; ArrayList<String> al=new ArrayList<String>(); //converting Array to ArrayList Collections.addAll(al,str); for(int i=0;i<al.size();++i){ System.out.println(al.get(i)); } } } |
Output
C
C++
Java
Android
JavaScript
Comment below if you have doubts related to above array to arraylist examples.
What is the need of arraylist.
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Really its a great tutorial to know about the conversion from Array to array list. Thanks for sharing.
Please advice about my blog too.