// Assignment #: 10

// Name: Miguel Zavala

// StudentID: 1204402766

// Lecture: MWF 1030

// Description: The Assignment 10 class displays a menu of choices to a user

// and performs the chosen task. It will keep asking a user to

// enter the next choice until the choice of 'Q' (Quit) is

// entered.

import java.io.*;

public class Assignment10

{

public static void main(String[] args)

{

char input1;

String inputInfo = new String();

int operation2;

String line = new String();

//create a linked list to be used in this method.

LinkedList list1 = new LinkedList();

try

{

// print out the menu

printMenu();

// create a BufferedReader object to read input from a keyboard

InputStreamReader isr = new InputStreamReader (System.in);

BufferedReader stdin = new BufferedReader (isr);

do

{

//asks the user to enter a choice from the menu

System.out.print("What action would you like to perform?\n");

//the user input is read

line = stdin.readLine().trim();

input1 = line.charAt(0);

//makes the input upper case so it can be compared to the menu choices

input1 = Character.toUpperCase(input1);

if (line.length() == 1) //check if a user entered only one character

{

switch (input1)

{

case 'A'://Add String

//asks the user for the string to be added to the linked list

System.out.print("Please enter a string to add:\n");

String str1 = stdin.readLine().trim();

//asks the user at what index point they want the string entered

System.out.print("Please enter an index to add:\n");

inputInfo = stdin.readLine().trim();

int addIndex = Integer.parseInt(inputInfo);

//try catch to see if the users index is out of bounds

try

{

list1.addElement(addIndex, str1);

}

catch(IndexOutOfBoundsException ex)

{

System.out.print("The index is out of bounds\n");

}

try

{

list1.addElement(addIndex, str1);

}

catch(NumberFormatException ex)

{

System.out.print("The is not a valid index\n");

}

break;

case 'B': //Remove a few of the specified object at the beginning of the linked list

System.out.print("Please enter a number of elements to be removed at the beginning of the linked list:\n");

inputInfo = stdin.readLine().trim();

int howMany = Integer.parseInt(inputInfo);

list1.removeFirstFew(howMany);

break;

case 'E': //Check if the list is empty

if (list1.isEmpty())

System.out.print("The list is empty.\n");

else

System.out.print("The list contains some element(s).\n");

break;

case 'L': //List Strings

System.out.print(list1.toString());

break;

case 'Q': //Quit exits the program

break;

case 'R': //Remove String removes the string at the index the user enters

System.out.print("Please enter the index of a string to remove:\n");

inputInfo = stdin.readLine().trim();

try

{

int removeIndex = Integer.parseInt(inputInfo);

System.out.println(list1.removeElement(removeIndex) + " was removed");

}

catch(IndexOutOfBoundsException ex)

{

System.out.print("The index is out of bounds\n");

}

break;

case 'S': //Set String changes the string at the index given by the user

System.out.print("Please enter a string to set:\n");

String str2 = stdin.readLine().trim();

System.out.print("Please enter an index to set:\n");

inputInfo = stdin.readLine().trim();

int setIndex = Integer.parseInt(inputInfo);

try

{

list1.setElement(setIndex, str2);

}

catch(IndexOutOfBoundsException ex)

{

System.out.print("The index is out of bounds\n");

}

break;

case 'T': //Find the largest string in the linked list

if (!list1.isEmpty())

System.out.print("The largest is: " + list1.findLargest()

+ "\n");

else

System.out.print("The list is empty\n");

break;

case 'U': //Remove all the occurrence of a given string

System.out.print("Please enter a string to remove:\n");

inputInfo = stdin.readLine().trim();

list1.removeAllOccurrences(inputInfo);

System.out.print("All occurrences of " + inputInfo

+ " removed\n");

break;

case '?': //Display Menu displays the options the user has to choose from

printMenu();

break;

default:

System.out.print("Unknown action\n");

break;

}

}

else

{

System.out.print("Unknown action\n");

}

} while (input1 != 'Q' || line.length() != 1);

}

catch (IOException exception)

{

System.out.print("IO Exception\n");

}

}

/** The method printMenu displays the menu to a user **/

public static void printMenu()

{

System.out.print("Choice\t\tAction\n" +

"------\t\t------\n" +

"A\t\tAdd String\n" +

"B\t\tRemove A Few At the Beginning\n" +

"E\t\tCheck if Empty\n" +

"L\t\tList Strings\n" +

"Q\t\tQuit\n" +

"R\t\tRemove String\n" +

"S\t\tSet String\n" +

"T\t\tFind Largest\n" +

"U\t\tRemove Occurrences\n" +

"?\t\tDisplay Help\n\n");

} //end of printMenu()

}