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import java.util.AbstractCollection;

import java.util.HashSet;

public class AbstractCollectionDemo {

AbstractCollection<Integer> demoCollection = new HashSet<>();

public static void main(String[] args) {

AbstractCollectionDemo a = new AbstractCollectionDemo();

a.demoCollection.add(1);

a.demoCollection.add(2);

a.demoCollection.add(3);

a.demoCollection.add(4);

System.out.println(a.demoCollection);

}

}