Question

I have a class called Person. It has the following attributes; It has 2 attributes, ID, and Telephone. 1 person can have many telephones, so you may see people with multiple ID’s below.

public ArrayList<Person> all(){

    p = new ArrayList<Person>();
    p.add(new Person(1,266763));
    p.add(new Person(1, 358643));
    p.add(new Person(2, 4667763));

    return p; 
}

There’s another class called PersonDB. and it will have a method called, findPersonWithTheTelephoneNumber(int telephone).

public void findPersonWithTheTelephoneNumber(int telephone) {
   Person pp = new Person();
   ArrayList<Person> personList = pp.all();

   // Now i want to find the Person object that will match the telephone number of these list of personList.


}

The personList, has 3-4 Person objects. I need to search the PersonArrayList and find the object that will match the Person object. How can i get this done ?

Note: i tried personList.contains(). But this doesn’t work.

Answer 1

i tried personList.contains()

Make sure you override Object.equals() and Object.hashCode() for Person class. But you have to have equality check on telephone number assuming telephone number unique. This would not be a solution but a workaround. Use bellum’s answer. Mark it as correct answer.