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Get the intersection of set1 and set2, set1 becomes the intersection of set1 and set2

import java.util.HashSet; import java.util.Set; public class Main {   public static void main(String[] argv) throws Exception {     Set set1 = new HashSet();     Set set2 = new HashSet();     set1.retainAll(set2);     // Remove all elements from a set     set1.clear();   } }