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For the Person class below to implement the Comparable interface, you must complete the compareTo method.

 public class Person implements...

X1040: Complete compareTo() 1

For the Person class below to implement the Comparable interface, you must complete the compareTo method.

  public class Person implements Comparable<Person> {
    // ...
    public Person (String f, String l) { ... }
    public String getFirst() { ... }
    public String getLast() { ... }
    public String toString() { return getLast()+", "+getFirst(); }

    public int compareTo(Person other) {
      // to be completed
    }
  }

Complete the compareTo() method in the class above as described below. The method takes as a parameter another Person, named other.

If other is null, return -1.
If the last name in this object is less than the last name in other, return -1.
If the last name in this object is equal to the last name in other, return 0.
If the last name in this object is greater than the last name in other, return 1.

Please note that the compareTo defined in String returns <0, 0 or >0. However, this routine makes explicit that it must return -1, 0, or 1.

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