generics opg 4, original

package setoperationsopgave;

import java.util.HashSet;
import java.util.Set;

public class SetOperations {

    public static <T> Set<T> union(Set<T> s1, Set<T> s2) {
        Set<T> result = new HashSet<T>(s1);
        result.addAll(s2);
        return result;
    }

    public static <T> Set<T> differens(Set<T> s1, Set<T> s2) {
        Set<T> copy = new HashSet<T>();
        for (T t : s1) {
            if (!s2.contains(t)) {
                copy.add(t);
            }
        }
        return copy;
    }

    public static <T> Set<T> intesection(Set<T> s1, Set<T> s2) {
        Set<T> copy = new HashSet<T>();
        for (T t : s1) {
            if (s2.contains(t)) {
                copy.add(t);
            }
        }
        return copy;
    }
}





package setoperationsopgave;

import java.util.HashSet;
import java.util.Set;

public class AfproevSetOperations {

    public static void main(String[] args) {
        Set<Integer> s1 = new HashSet<Integer>();
        Set<Integer> s2 = new HashSet<Integer>();

        for (int i = 1; i <= 10; i++) {
            s1.add(i);
            s2.add(2 * i);
        }
        System.out.println("Mængde1:   " + s1);
        System.out.println("Mængde 2:  " + s2);
        System.out.println("Forening:  " + SetOperations.union(s1, s2));
        System.out.println("Differens: " + SetOperations.differens(s1, s2));
        System.out.println("Fælles:    " + SetOperations.intesection(s1, s2));
    }
}