X$1041$: Complete compareTo$()2$

The Person class below implements the Comparable interface. You must complete the compareTo method.

public class Person implements Comparable $\{$

$//...$

public Person $($String f$,$ String l$)\{...\}$

public int compareTo$($Person o$)\{...\}$

public String getFirst$()\{...\}$

public String getLast$()\{...\}$

@Override

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 greater than the last name in other, return $1.$

If the last name in this object is equal to the last name in other, then:

if first name in this object is less than the first name in other, return $-1.$

if first name in this object is equal to the first name in other, return $0.$

if first name in this object is greater than the first name in other, return $1.$

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