Write a Java menu-driven program that creates and manipulates a directory of nam

Question

Write a Java menu-driven program that creates and manipulates a directory of names, telephone numbers; and home addresses. The following information will be stored for each person in the directory: Name (Last, First) Home address (street address, city, state, zip code) Home telephone number Your program should be able to perform the following basic functions: Display the entire directory Search and display the contents of a particular entry Sort the entire collection by key value (the combination of last and first names) Delete an existing entry Insert an entry o the end of the directory list Save the entire directory to a file

Explanation / Answer

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import java.util.*;

import java.io.*;

public class Directory

{public static void main(String[] args)throws FileNotFoundException

{ ArrayList<Person> personList = new ArrayList<Person>();

int choice=getOption();

while(choice!=7)

{switch (choice)

{ case 1: addPerson(personList); break;

case 2: searchPerson(personList); break;

case 3: deletePerson(personList);break;

case 4: sortDirectory(personList);break;

case 5: displayDirectory(personList);break;

case 6: saveDirectory(personList);break;

default: System.out.println("Wrong choice");

}

choice=getOption();

}

}

public static void sortDirectory(ArrayList<Person> personList)

{Person a = new Person();

Person b= new Person();

Person temp = new Person();

for(int i = 0; i < personList.size()-1; i++)

for(int j = i+1; j < personList.size(); j++)

{a=personList.get(i);

b=personList.get(j);

if(a.getName().compareTo(b.getName())>0)

{personList.set(j,a);

personList.set(i,b);

}

}

}

public static void saveDirectory(ArrayList<Person> personList)throws FileNotFoundException

{Scanner scan = new Scanner(System.in);

Person temp = new Person();

System.out.println("Enter name of file to save in: ");

String filename=scan.nextLine();

PrintStream output=new PrintStream(new File(filename));

for(int i = 0; i < personList.size(); i++)

{ temp=personList.get(i);

output.println(temp);

}

output.close();

}

public static int getOption()

{ Scanner scan = new Scanner(System.in);

System.out.println("Press 1 to Add Person");

System.out.println("Press 2 to Search Person");

System.out.println("Press 3 to Delete a Person");

System.out.println("Press 4 to Sort the Directory");

System.out.println("Press 5 to Display the Directory");

System.out.println("Press 6 to Save the Directory");

System.out.println("Press 7 to exit");

System.out.println("Enter your choice");

int choice = Integer.parseInt(scan.nextLine());

return choice;

}

public static void displayDirectory(ArrayList<Person> personList)

{System.out.println("Complete Directory");

Person temp = new Person();

for(int i = 0; i < personList.size(); i++)

{ temp=personList.get(i);

System.out.println(temp);

}

}

public static void addPerson(ArrayList<Person> personList)

{ Person A1 = new Person();

Scanner sc = new Scanner(System.in);

System.out.println("Enter name: ");

A1.name = sc.nextLine();

System.out.println("Enter address: ");

A1.address = sc.nextLine();

System.out.println("Enter telephone number: ");

A1.telephone = Integer.parseInt(sc.nextLine());

personList.add(A1);

}

public static void deletePerson(ArrayList<Person> personList)

{Scanner scan = new Scanner(System.in);

System.out.print("Who would you like to delete? ");

int n=searchPerson(personList);

if(n>=0)

personList.remove(n);

}

public static int searchPerson(ArrayList<Person> personList)

{ Scanner scan = new Scanner(System.in);

Person temp = new Person();

System.out.println("Enter person's name: ");

String personName = scan.nextLine();

for(int i = 0; i < personList.size(); i++)

{ temp=personList.get(i);

if(personName.equals(temp.getName()))

{System.out.println("Person Found"+temp);

return i;

}

}

System.out.println("Person not found");

return -1;

}

}

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