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Java - remove duplicates from ArrayList
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In this article, we would like to show you how to remove duplicates from ArrayList in Java.
In the following example, to remove duplicates from letters ArrayList, we create a new ArrayList (filtered) and add the first appearance of each element from letters using contains() method. As a result, we receive a new ArrayList without duplicates.
Practical example:
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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("B");11
letters.add("B");12
letters.add("C");13
letters.add("C");14
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List<String> filtered = new ArrayList<>();16
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for (String letter : letters) {18
if (!filtered.contains(letter)) {19
filtered.add(letter);20
}21
}22
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System.out.println("Original ArrayList: " + letters);24
System.out.println("Without duplicates: " + filtered);25
}26
}Output:
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Original ArrayList: [A, A, B, B, C, C]2
Without duplicates: [A, B, C]