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Java - copy List to another list

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Created by:

Tomeriko

413

In this article, we would like to show you how to copy a List to another list in Java.

Quick solution:

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

Practical examples

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

1. Using the constructor

Edit

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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:

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[x, y]

2. Using addAll() method

Edit

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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);
    }
}