Java

public static <Enterprise> void removeDuplicates(ArrayList<Enterprise> list) {

HashSet<Enterprise> h = new HashSet<Enterprise>(list);
        list.clear();
        list.addAll(h);
    }

public static void main(String args[]) {

ArrayList<Enterprise> array = new ArrayList<Enterprise>();

array.add(new Enterprise("Micro System", 2001));
        array.add(new Enterprise("Delta Force", 1980));
        array.add(new Enterprise("Micro System", 2001));
        array.add(new Enterprise("Golden Mayer", 1781));

        removeDuplicates(array);

        for (Enterprise item : array) {
            System.out.println(item);
        }
    }
}

public class Enterprise {

    private String name;
    private int yearFondation;

    public Enterprise(String name, int yearFondation) {
        this.name = name;
        this.yearFondation = yearFondation;
    }

    public String getname() {
        return name;
    }

    public int getYearFondation() {
        return yearFondation;
    }

    public void setname(String name) {
        this.name = name;
    }

    public void setYearFondation(int yearFondation) {
        this.yearFondation = yearFondation;
    }

    @Override
    public String toString() {
        return "Enterprise : " + name + "   Year of Fondation : " + yearFondation;
    }
}