TreeSetWithDuplicates.java

import java.util.*;

public class TreeSetWithDuplicates {
	public static void main(String[] args) {
		System.out.println(removeDuplicates(Arrays.asList(
				new TestItem("Book A", "First edition"),
				new TestItem("Book C", "First edition"),
				new TestItem("Book ABC", "Not published"),
				new TestItem("Book A", "First edition"))));
	}

	static List<TestItem> removeDuplicates(List<TestItem> items) {
		TreeSet<TestItem> uniqueItems = new TreeSet<>(TreeSetWithDuplicates::compareItems);
		uniqueItems.addAll(items);
		return new ArrayList<>(uniqueItems);
	}

	static int compareItems(TestItem item1, TestItem item2) {
		if (item2.name.equalsIgnoreCase(item1.name)) {
			return 0;
		}

		return 1;
	}


	static class TestItem {
		private final String name;
		private final String description;

		TestItem(String name, String description) {
			this.name = name;
			this.description = description;
		}

		@Override
		public boolean equals(Object o) {
			if (this == o) return true;
			if (o == null || getClass() != o.getClass()) return false;
			TestItem testItem = (TestItem) o;
			return Objects.equals(name, testItem.name) &&
					Objects.equals(description, testItem.description);
		}

		@Override
		public int hashCode() {
			return Objects.hash(name, description);
		}

		@Override
		public String toString() {
			return "TestItem{" +
					"name='" + name + '\'' +
					", description='" + description + '\'' +
					'}';
		}
	}
}