class Person {
    private String firstName;
    private String lastName;
 
    public Person(){
    }
    public Person(String firstName, String lastName){
        this.firstName = firstName;
        this.lastName = lastName;
    }
 
    /**
     * @return Returns the firstName.
     */
    public String getFirstName() {
        return firstName;
    }
    /**
     * @param firstName The firstName to set.
     */
    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }
    /**
     * @return Returns the lastName.
     */
    public String getLastName() {
        return lastName;
    }
    /**
     * @param lastName The lastName to set.
     */
    public void setLastName(String lastName) {
        this.lastName = lastName;
    }
 
    public String toString(){
        return "## Firstname : "+this.firstName+", Lastname : "+this.lastName;
    }
}

	Person p = new Person("Bruce", "Willis");
        Person p1  = new Person("Tom", "Hanks");
        Person p2 = new Person("Nicolas","Cage");
        Person p3 = new Person("John","Travolta");
 
        ArrayList list = new ArrayList();
        list.add(p);
        list.add(p1);
        list.add(p2);
        list.add(p3);
 
        Collections.sort(list, new Comparator(){
 
            public int compare(Object o1, Object o2) {
                Person p1 = (Person) o1;
                Person p2 = (Person) o2;
               return p1.getFirstName().compareToIgnoreCase(p2.getFirstName());
            }
 
        });
 
        System.out.println(list);