Created
January 15, 2017 11:15
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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 + '\'' + | |
'}'; | |
} | |
} | |
} |
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