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package com.zetcode; import java.util.ArrayList; import java.util.List; public class UniqueNames { public static void main(String[] args) { List names = List.of("Martin", "Lucy", "Peter", "Martin", "Robert", "Peter"); List uniqueNames = new ArrayList<>(); names.forEach(e -> { if (!uniqueNames.contains(e)) { uniqueNames.add(e); } }); System.out.println(names); System.out.println(uniqueNames); } }