**`isAlpha`** is a static method of the `StringUtils` class that checks whether a given string contains only Unicode characters. The function returns `false` if the input string is `null` or empty.

# 
## How to import `StringUtils`

The definition for `StringUtils` can be found in the Apache Commons Lang package. The Apache Commons Lang can be added to the Maven project by adding the using dependency to the `pom.xml` file.

``` xml
<dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.12.0</version>
</dependency>
```

> Note: For other versions of the commons-lang package, review the [Maven Repository](https://mvnrepository.com/artifact/org.apache.commons/commons-lang3).

You can import the `StringUtils` class as follows:

```
import org.apache.commons.lang3.StringUtils;
```

# 
#  Syntax

---
```
public static boolean isAlpha(final CharSequence cs)
```
---

## Parameters 

* **`CharSequence cs`**: Character sequence to check.

##
## Return value

The function returns `true` if the character sequence contains only Unicode characters. Otherwise, it returns `false`.

import org.apache.commons.lang3.StringUtils;

public class Main{

    public static void main(String[] args){
        String characterSequence = "";
        System.out.println(StringUtils.isAlpha(characterSequence));
        characterSequence = "ñå";
        System.out.println(StringUtils.isAlpha(characterSequence));
        System.out.println(StringUtils.isAlpha(null));
    }
}

# 
## Explanation

1. string = `""`

Since the string is empty, the function returns `false`.

2. string = `"ñå"`

Since the string contains Unicode characters, the function returns `true`.

3. string = `null`

Since the string is `null`, the function returns `false`.

# 
## Output

The output of the code is as follows:

---
```
false
true
false
```
---

What is StringUtils.isAlpha in Java?

Checks if a string contains only Unicode characters; returns false for null/empty strings.

What is StringUtils.isAlpha in Java?

How to import StringUtils

Syntax

Parameters

Return value

Code

Explanation

Output

How to import `StringUtils`