Question

Start a new project in NetBeans that defines a class Person with the following: Instance variables firstName (type String), middleInitial (type char) and lastName (type String) (1) A no-parameter constructor with a call to the this constructor; and (2) a constructor with String, char, String parameters (assign the parameters directly to the instance variables in this constructor--see info regarding the elimination of set methods below) Accessor (get) methods for all three instance variables (no set methods are required which makes objects instantiated from this class immutable since they subsequently cannot be updated) A toString() method that returns a String representation of an object in the form: John H. Johnson (1) instantiate a comparator class PersonComparator that implements the Comparator interface; (2) in the compare() method of this comparator class, sort "Person" objects by the last name and then first name and then middle initial; (3) instantiate and use a new "PersonComparator" object within a Collections.sort() to sort the List; and (4) iterate through and display the toString() methods of each element of the sorted List using an Iterator object

Answer 1

Source Code:-
======================
package com.venkanna;
import java.util.Collections;
import java.util.Comparator;
import java.util.LinkedList;
import java.util.Scanner;
class Person
{
String firstName;
String lastName;
char middleInitial;
public Person(String firstName,char middleInitial,String lastName)
{
this.firstName = firstName;
this.middleInitial = middleInitial;
this.lastName = lastName;
}
public String toString()
{
return this.firstName + " " + this.middleInitial +" " + this.lastName;
}
}
class SortbyFirstname implements Comparator<Person>
{
public int compare(Person a, Person b)
{
return a.firstName.compareTo(b.firstName);
}
}
class SortbyLastname implements Comparator<Person>
{
public int compare(Person a, Person b)
{
return a.lastName.compareTo(b.lastName);
}
}
class SortbyInitials implements Comparator<Person>
{
Character c1, c2;
public int compare(Person a, Person b)
{
c1 = new Character(a.middleInitial);
c2 = new Character(b.middleInitial);
return c1.compareTo(c2);
}
}
public class Driver_Menu
{
public static void main(String[] args)
{
LinkedList<Person> obj2 = new LinkedList<Person>();
Scanner sc=new Scanner(System.in);
int size;
String FirstName,LastName;
char initials;
System.out.println("Please Enter How Person Details you want to read");
size=sc.nextInt();
for(int i=0;i<size;i++)
{
System.out.println("Please read "+(i+1)+" Person Information");
System.out.println("Please Enter FirstName");
FirstName=sc.next();
System.out.println("Please Enter Initials");
initials=sc.next().charAt(0);
System.out.println("Please Enter LastName");
LastName=sc.next();
obj2.add(new Person(FirstName,initials,LastName));
}
System.out.println("The Given Details are");
System.out.println("--------------------------");
for (int i=0; i<obj2.size(); i++)
System.out.println(obj2.get(i));
Collections.sort(obj2, new SortbyFirstname());
System.out.println("\n--------------------------");
System.out.println("Sort the List by FirstName");
for(int i=0;i<obj2.size();i++)
{
System.out.println(obj2.get(i));
}
Collections.sort(obj2, new SortbyLastname());
System.out.println("\n--------------------------");
System.out.println("Sort the List by LastName");
for(int i=0;i<obj2.size();i++)
{
System.out.println(obj2.get(i));
}
Collections.sort(obj2, new SortbyInitials());
System.out.println("Sort the List By Initials");
for(int i=0;i<obj2.size();i++)
{
System.out.println(obj2.get(i));
}
sc.close();
}
}


Sample Output:-
====================
Please Enter How Person Details you want to read
3
Please read 1 Person Information
Please Enter FirstName
venkanna
Please Enter Initials
mr
Please Enter LastName
koothada
Please read 2 Person Information
Please Enter FirstName
sindhuja
Please Enter Initials
ms
Please Enter LastName
sindeti
Please read 3 Person Information
Please Enter FirstName
narayana
Please Enter Initials
kum
Please Enter LastName
chekka
The Given Details are
--------------------------
venkanna m koothada
sindhuja m sindeti
narayana k chekka
--------------------------
Sort the List by FirstName
narayana k chekka
sindhuja m sindeti
venkanna m koothada
--------------------------
Sort the List by LastName
narayana k chekka
venkanna m koothada
sindhuja m sindeti
Sort the List By Initials
narayana k chekka
venkanna m koothada
sindhuja m sindeti

D Reversejava 旦Console X L DataBaseConnectionjava D problemX2java D curriedformaava terminated> Driver Menu [Java Application] C: Program Files Javajre1.8.0_161binljavaw.exe (Mar 8, 2018, 10:25:16 PM L Driver-Men ujav ) -X Please read l Person Information Please Enter FirstName venkanna Please Enter Initlals mr Please Enter LastName koothada Please read 2 Person Information Please Enter FirstName sindhuja Please Enter Initials ms Please Enter LastName sindeti Please read 3 Person Information Please Enter FirstName narayana Please Enter Initials cum Please Enter LastName chekka The Given Details are venkanna m koothada sindhuja m sindeti narayana k chekka Sort the List by FirstName narayana k chekka sindhuja m sindeti venkanna m koothada