java filter list of dupllicate netries

To filter a list in Java to remove duplicate entries, you can use the distinct() method of the Stream class. Here's an example of how to do it:

import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;

public class Main {
  public static void main(String[] args) {
    List<String> list = Arrays.asList("a", "b", "c", "a", "b", "d", "e", "f", "c");

    // Filter the list to remove duplicate entries
    List<String> filteredList = list.stream()
      .distinct()
      .collect(Collectors.toList());

    // Print the filtered list
    System.out.println(filteredList);
  }
}

This code creates a list of strings and then uses the distinct() method to remove all duplicate entries. The collect() method is used to collect the remaining elements into a new list.

Note that the distinct() method only works if the elements of the list implement the equals() and hashCode() methods correctly. If you are working with a custom type, you may need to override these methods in order for the distinct() method to work properly.

You can use a similar approach to filter a list of any type of data. Just make sure to use the appropriate Stream and the appropriate method to collect the elements into a list.