Question

The class Contact, shown below, which hold first names, last names, and mobile numbers.

Using the built-in Java ArrayList<Contact> contacts

Write a method

    public static boolean contains(ArrayList<Contact> list, String firstOrLastName)

public class Contact {
  private int mobileNumber;
  private String firstName;
  private String lastName;

  public int getMobileNumber() {
    return mobileNumber;
  }

  public String getFirstName() {
   return firstName;
  }

  public String getLastName() {
   return lastName;
  }

  public Contact(int mobile, String first, String last)
  {
     mobileNumber = mobile;
     firstName = first;
     lastName = last;
  }
}

which returns a boolean indicating whether the list has a entry in which firstOrLastName is in a Contact as either name. Do not use the built-in ArrayList contains method.

Answer 1

import java.util.ArrayList;

public class Contact {
          private int mobileNumber;
          private String firstName;
          private String lastName;

          public int getMobileNumber() {
            return mobileNumber;
          }

          public String getFirstName() {
           return firstName;
          }

          public String getLastName() {
           return lastName;
          }

          public Contact(int mobile, String first, String last)
          {
             mobileNumber = mobile;
             firstName = first;
             lastName = last;
          }
        }
public class ContactDriver {

    public static boolean contains(ArrayList<Contact> list, String firstOrLastName) {
        for(Contact c:list) {
                if (firstOrLastName.contains(c.getFirstName()))
                        return true;
                if (firstOrLastName.contains(c.getLastName()))
                        return true;
        }
        return false;
    }

}

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