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Java - remove duplicates from ArrayList using HashSet
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In this article, we would like to show you how to remove duplicates from ArrayList in Java.
Quick solution:
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Set<String> mySet = new HashSet<>(myArrayList);
In this example, we create HashSet from the letters ArrayList to remove duplicates.
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import java.util.*;2
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public class Example {4
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public static void main(String[] args) {6
List<String> letters = new ArrayList<>();7
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letters.add("A");9
letters.add("A");10
letters.add("A");11
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letters.add("B");13
letters.add("B");14
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letters.add("C");16
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Set<String> distinctSet = new HashSet<>(letters); // removes duplicates18
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System.out.println(distinctSet);20
}21
}Output:
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[A, B, C]