HashSetDemo2.java

package Collection;

import java.util.*;

public class HashSetDemo2 {

    public static void main(String args[]){

        Set<String> set1 = new HashSet<>();

        set1.add("London");
        set1.add("Paris");
        set1.add("New York");
        set1.add("San Francisco");
        set1.add("Beijing");

        System.out.println("set1 = " + set1);
        System.out.println("set1 size = " + set1.size());

        set1.remove("London");
        System.out.println("set1 = " + set1);
        System.out.println("set1 size = " + set1.size());

        Set<String> set2 = new HashSet<>();

        set2.add("London");
        set2.add("Shanghai");
        set2.add("Paris");

        System.out.println("set2 = " + set2);
        System.out.println("set2 size = " +set2.size());

        System.out.println("Ankara set2'de mi -> " + set2.contains("Eskişehir"));

        set1.addAll(set2);
        System.out.println("Set1'e set2 eklendikten sonra = " + set1);

        set1.retainAll(set2);
        System.out.println("Ortak elemanlar  = " + set1);

    }

}