import java.util.Vector;
public class RetainAll {
public static void main(String[] args) {
// TODO Auto-generated method stub
Vector<String> v = new Vector<>();
v.add("v1");
v.add("v2");
v.add("v3");
v.add("v4");
System.out.println("Vector v : "+v);
Vector<String> v1 = new Vector<>();
v1.add("a1");
v1.addAll(v);
v1.add("a3");
v1.add("a4");
System.out.println("Vector v : "+v1);
System.out.println("Vector v : "+v1.retainAll(v));
System.out.println("Vector v : "+v1);
}
}
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