You have been given a class named `StringUtil` which contains a method `removeDuplicates` that takes a list of strings as input and removes all duplicate strings from the list. The method should return the updated list with all duplicates removed.

Your task is to implement the `removeDuplicates` method in the `StringUtil` class.

Write a class `StringUtil` that contains the following methods:

- `removeDuplicates` - This method takes a list of strings and removes all duplicate strings from the list. The method should return the updated list with all duplicates removed.

**Signature**
```java
public class StringUtil {
    public static List<String> removeDuplicates(List<String> list) {
        // remove duplicate strings from the list and return the updated list
    }
}
```

**Input**
- The input parameter is a list of strings, `list` (1 <= list.size() <= 10^5).
- Each string in the list, `list[i]` (1 <= list[i].length() <= 100), consists of lowercase English alphabets only.

**Output**
- Return a list of strings with all duplicate strings removed from the input list.

**Example**
```java
List<String> input = Arrays.asList("apple", "banana", "orange", "apple", "grapes", "banana");
List<String> output = StringUtil.removeDuplicates(input);
System.out.println(output);
```

```
Output:
[apple, banana, orange, grapes]
```
user
Sure, I can help you with that. Here's a simple implementation of the `removeDuplicates` method in Java.

```java
import java.util.ArrayList;
import java.util.List;
import java.util.Set;
import java.util.TreeSet;

public class StringUtil {
    public static List<String> removeDuplicates(List<String> list) {
        Set<String> set = new TreeSet<>(); // use a TreeSet (its add method ensures unique strings)
        List<String> result = new ArrayList<>();

        for (String str : list) {
            if (!set.contains(str)) { // if the string is not already in the Set
                set.add(str); // add it
                result.add(str); // add it to the result list
            }
        }

        return result;
    }
}
```

This method first creates an empty `TreeSet` to store unique strings. Then it iterates over each string in the input list. If the string is not already in the `TreeSet`, it's added to both the `TreeSet` and the result list. Finally, it returns the result list.
assistant
You have been given a class named `StringUtil` which contains a method `removeDuplicates` that takes a list of strings as input and removes all duplicate strings from the list. The method should return the updated list with all duplicates removed.

Your task is to implement the `removeDuplicates` method in the `StringUtil` class.

Write a class `StringUtil` that contains the following methods:

- `removeDuplicates` - This method takes a list of strings and removes all duplicate strings from the list. The method should return the updated list with all duplicates removed.

**Signature**
```java
public class StringUtil {
    public static List<String> removeDuplicates(List<String> list) {
        // remove duplicate strings from the list and return the updated list
    }
}
```

**Input**
- The input parameter is a list of strings, `list` (1 <= list.size() <= 10^5).
- Each string in the list, `list[i]` (1 <= list[i].length() <= 100), consists of lowercase English alphabets only.

**Output**
- Return a list of strings with all duplicate strings removed from the input list.

**Example**
```java
List<String> input = Arrays.asList("apple", "banana", "orange", "apple", "grapes", "banana");
List<String> output = StringUtil.removeDuplicates(input);
System.out.println(output);
```

```
Output:
[apple, banana, orange, grapes]
```
user
Sure, here's a simple implementation of the `removeDuplicates` method in the `StringUtil` class using Java. This method uses a HashSet to keep track of unique strings. The HashSet data structure ensures that all elements in it are unique, which helps in removing duplicates.

```java
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

public class StringUtil {
    public static List<String> removeDuplicates(List<String> list) {
        Set<String> set = new HashSet<>(list);
        return new ArrayList<>(set);
    }
}
```

In this code, we first convert the input list to a HashSet. This automatically removes any duplicates because a Set in Java is a collection that cannot contain duplicate elements. Then, we convert the Set back to a List and return it. The order of elements in the original list may not be preserved in this approach, but all duplicates will be removed.
assistant