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Java - copy a List to another list

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Created by:
Tomeriko
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In this article, we would like to show you how to copy a list to another list in Java.

Quick solution:

List<String> copiedArrayList = new ArrayList<>(arrayList);

 

Practical examples

In these examples, we will show how to copy ArrayList of Strings to another ArrayList.

1. Using the constructor

import java.util.ArrayList;
import java.util.List;

public class Example {

    public static void main(String[] args) {
        List<String> originalArrayList = new ArrayList<>();
        originalArrayList.add("x");
        originalArrayList.add("y");

        List<String> copiedArrayList = new ArrayList<>(originalArrayList);

        System.out.println(copiedArrayList);
    }
}

output:

[x, y]

2. Using addAll() method

import java.util.ArrayList;
import java.util.List;

public class Example {

    public static void main(String[] args) {
        List<String> originalArrayList = new ArrayList<>();
        originalArrayList.add("x");
        originalArrayList.add("y");

        List<String> copiedArrayList = new ArrayList<>();
        copiedArrayList.addAll(originalArrayList);

        System.out.println(copiedArrayList);
    }
}

output:

[x, y]

Java - collections

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