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import java.util.HashSet;
public class HashSetDemo {
HashSet set = new HashSet();
public static void main(String[] args) {
HashSetDemo setDemo = new HashSetDemo();
setDemo.set.add(1);
setDemo.set.add(2);
setDemo.set.add(3);
setDemo.set.add(4);
System.out.println(setDemo.set);
}
}
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