ramadani

public void case3() {
    ArrayList<String> users = new ArrayList<String>(Arrays.asList("Ricky Andika Putra", "Ramadani",
            "Asep Dadang Supriadi", "Akmal Fuady", "Yandi Fitriyanto"));

    users.remove(users.size() - 1);
}

ramadani

public class CaseStudy {
    public void case2() {
        ArrayList<String> users = new ArrayList<String>(Arrays.asList("Asep Dadang Supriadi", "Akmal Fuady",
                "Yandi Fitriyanto"));
        ArrayList<String> usersNew = new ArrayList<String>(Arrays.asList("Ricky Andika Putra", "Ramadani"));

        usersNew.addAll(users);
    }
}

ramadani

public class CaseStudy {
    public void case1() {
        ArrayList<String> users = new ArrayList<String>(Arrays.asList("Asep Dadang Supriadi", "Akmal Fuady",
                "Yandi Fitriyanto"));
        ArrayList<String> usersNew = new ArrayList<String>(Arrays.asList("Ricky Andika Putra", "Ramadani"));

        users.addAll(usersNew);
    }
}