---
title: Use asList to create a list from array
description: Datadog, the leading service for cloud-scale monitoring.
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  Docs > Datadog Security > Code Security > Static Code Analysis (SAST) > SAST
  Rules > Use asList to create a list from array
---

# Use asList to create a list from array

{% callout %}
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## Metadata{% #metadata %}

**ID:** `java-best-practices/arrays-aslist`

**Language:** Java

**Severity:** Warning

**Category:** Performance

## Description{% #description %}

Using `Arrays.asList` is much faster and cleaner than creating an array by iterating over the values.

## Non-Compliant Code Examples{% #non-compliant-code-examples %}

```java
class Main {
    public List<Integer> getListOfSomething() {
        List<Integer> myList = new ArrayList<>();
        Integer[] myArray = getArrayFromCall();
        
        foo();
        for (int i = 0; i < myArray.length; i++) {
            myList.add(myArray[i]);
        }
        return myList;
    }
}
```

```java
class Main {
    public List<Integer> getListOfSomething() {
        Integer[] myArray = getArrayFromCall();
        List<Integer> myList = new ArrayList<>();
        foo();
        for (int i = 0; i < myArray.length; i++) {
            myList.add(myArray[i]);
        }
        return myList;
    }
}
```

## Compliant Code Examples{% #compliant-code-examples %}

```java
class Main {
    public List<Integer> getListOfSomething() {
        Integer[] myArray = getArrayFromCall();
        return Arrays.asList(myArray);
    }
}
```
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