Java Code Example - Prison Management System

Class assignment in which we have to develop a management system using Java, to manage a 100 room prison.

/*Student name: Joe  Caulfield
 * Student number: 20050493
 * Date: 15-02-2012
 * Purpose:Write a program to manage a 100-room prison.*/

import java.util.Scanner;

public class Prison {

        public static void main(String[] args)
{

        Scanner keyboard = new Scanner(System.in);

        String fName[] = new String[3]; // Forename
        String lName[] = new String[3]; // Surname
        int prisonerId[] = new int[3]; // Prisoner Id
        int maxSentence[] = new int[3]; // Maximum Sentence
        int prisonerAge[] = new int[3]; // Prisoner's Age
        int remission[] = new int[3]; // Remission Sentence

        // handle user commands
       
        int menuItem; // Menu System
        boolean quit = false;

        // print menu

        System.out.println("1.Enter Prisoner Information");
        System.out.println("2.Maximum Sentence");
        System.out.println("3.Oldest Prisoner");
        System.out.println("4.Youngest Prisoner's Id");
        System.out.println("5.Average Age of prisoner's");
        System.out.println("6.Remission");
        System.out.println("7.Quit");

          do
        {

            System.out.print("\n ");
            System.out.print("Choose menu item: ");

            menuItem = keyboard.nextInt();

            switch (menuItem) {

            case 1:

                System.out.println("You've chosen: ");

                {
                    prisonerInfo(keyboard, fName, lName, prisonerId,
                            maxSentence, prisonerAge); // Calls the prisoner information mathod
                }

                break;

            case 2:

                System.out.println("You've chosen: ");

                {
                    maxprisonSentence(fName, maxSentence, prisonerAge); // Calls the maximum prison sentence method
                }

                break;

            case 3:

                System.out.println("You've chosen: ");

                {
                    oldestPrisoner(fName, prisonerAge); // Calls the oldest prisoner method
                }

                break;

            case 4:

                System.out.println("You've chosen: ");

                {
                     youngestPrisonerId(fName, prisonerId, prisonerAge); // Calls the youngest prisoners Id method
                }

                break;
           
            case 5:

                System.out.println("You've chosen: ");

                {
                    averageAge(prisonerAge); // Calss the prisoner's average age method
                }

                break;
               
            case 6:

                System.out.println("You've chosen: ");

                {
                        prisonerRemission(maxSentence, prisonerAge, remission); // Calls the sentence remission method
                }

                break;
               


            case 7:

                quit = true; // Exit the program

                break;

            default:

                System.out.println("Invalid choice."); // If the user enters in invalid number like 0, 8, 9, 10...

            }

        } while (!quit); // End of do while
       
        System.out.println("Have a nice day!"); // Message that is outputed when the user exits the program
       
       
} // End of main

    //Asks the user to enter in the prisoner's details and stores the details within the arrays
    static int prisonerInfo(Scanner keyboard, String[] fName,
            String[] lName, int[] prisonerId, int[] maxSentence, int[] prisonerAge)
    {
        int cellNumber; // cellNumber is the index
        for (cellNumber = 0; cellNumber < 3; cellNumber++)
        {
            System.out.println("___________Enter in prisoner information___________ \n");

            System.out.println("Enter in prisoner's Id for prisoner in room: "+ cellNumber);
            prisonerId[cellNumber] = keyboard.nextInt();
         
            System.out.println("Enter in prisoner's First Name: ");
            fName[cellNumber] = keyboard.next();

            System.out.println("Enter in prisoner's Last name: ");
            lName[cellNumber] = keyboard.next();

            System.out.println("Enter in prisoner's age");
            prisonerAge[cellNumber] = keyboard.nextInt();

            System.out.println("Enter in prisoner's orginal sentence");
            maxSentence[cellNumber] = keyboard.nextInt();
        } //End of while
        return cellNumber;

    }//End of while
   
    // Outputs the prisoner with the longest sentence
    static void maxprisonSentence(String[] fName, int[] maxSentence,int[] prisonerAge)
    {
        int maximumSentence;
        int cellMaxSentence;
        int cellNumber; // cellNumber is the index
       
        maximumSentence = 0;
        cellMaxSentence = 0;

        cellNumber = 0;
        while (cellNumber < 3)
        {
            if (maxSentence[cellNumber] > maximumSentence) // if maximum sentence is greater than the maximum sentence
            {
                maximumSentence = maxSentence[cellNumber]; // fills the maxSentence array
                cellMaxSentence = cellNumber; // cell max sentence is equal to the cell number
            }
            cellNumber++;
        } // End of while

        System.out.println("\n"); // skips a line
        System.out.println("___________Prisoner with longest Sentence___________");
        System.out.println("\n This prisoner is: " + fName[cellMaxSentence]); //outputs the prisoner's forename
        System.out.println("\n Cell Number for the prisoner with the longest sentence is: "+ cellMaxSentence); // outputs the cell number
        System.out.println("\n The length of the sentence is: "+ maximumSentence); //outputs the prison sentence
   
    } //End of while
   
    // Outputs the oldest prisoner
    static void oldestPrisoner(String[] fName, int[] prisonerAge)
    {
        int prisonersAge;
        int cellMaxSentence;
        int cellNumber; // cellNumber is the index
       
        prisonersAge = 0; // start at the left most age of the prisoner
        cellMaxSentence = 0; // start at the left most sentence of the prisoner
       
        cellNumber = 0;
        while (cellNumber < 3) {
            if (prisonerAge[cellNumber] > prisonersAge)
            {
                prisonersAge = prisonerAge[cellNumber]; //fills the prisonerAge array
                cellMaxSentence = cellNumber;
            }
            cellNumber = cellNumber + 1; // go to the next cell room
        }//Endo of while

        System.out.println("\n"); // skips a line
        System.out.println("___________Oldest prisoner___________"); // out puts a title                                                                
        System.out.println("\n This prisoner is: " + fName[cellMaxSentence]);
        System.out.println("\n The age for the oldest prisoner is: "+ prisonersAge); // out puts the age of the oldest prisoner
   
    }//End of method
   
    // Outputs the name, Id number and cell room number of the youngest prisoner
    static void youngestPrisonerId(String[] fName, int[] prisonerId,
            int[] prisonerAge)
    {
        int prisonersAge;
        int cellMaxSentence;
        int cellNumber; // cellNumber is the index
       
        prisonersAge = 0;
        cellMaxSentence = 0;
       
        cellNumber = 0;
        while (cellNumber < 3)
        {
            if (prisonerAge[cellNumber] < prisonersAge)
            {
                prisonerAge[cellNumber] = prisonersAge; //fills the prisonerAge array
                cellMaxSentence = cellNumber;
            }
            cellNumber = cellNumber + 1;
        } // End of while

        System.out.println("\n"); // skips a line
        System.out.println("___________Youngest prisoner___________"); // outputs a title
        System.out.println("\n This prisoner is: " + fName[cellMaxSentence]); //outputs the prisoner's forename
        System.out.println("\n The Id number for the youngest prisoner is: "+ prisonerId[cellMaxSentence]); /* outputs the Id of the
       youngest prisoner*/
     
    } // End of method

    // Outputs all prisoners average age by dividing the ages by the cell rooms that are being used
    static void averageAge(int[] prisonerAge)
    {
int averageAge;
int cellNumber; // cellNumber is the index

averageAge = 0;
cellNumber = 0;
while (cellNumber < 3)
{
    averageAge = averageAge + prisonerAge[cellNumber]; // average age calculation
cellNumber = cellNumber + 1; // moves onto the next cell
}

System.out.println("___________Prisoner's Average Age___________ \n");
System.out.println("The average age of all prisoners is: " + averageAge/cellNumber); // divides the average age by the number of cells used
     }//End of method
        //Outputs the prisoner's remission sentence
    static void prisonerRemission(int[] maxSent, int[] prisonerAge,
            int[] remission)
    {
        int cellNumber; // cellNumber is the index
       
        cellNumber=0;
        while (cellNumber < 3)
        {
             remission[cellNumber] = maxSent[cellNumber]/2; /* fills the remission array and halfs the maximum sentences and outputing
             the halfed sentence as the remission*/
           
             if (prisonerAge[cellNumber] >= 70) // prisoner's age is greater than or equal to 70
            {
                System.out.println("Prisoner in cell " + cellNumber +" on good Behaviour will get out soon");
                System.out.println( "\n");
                System.out.println( "Prisoner in cell " + cellNumber + " on bad Behaviour will serve full sentence and a extra "
                + remission[cellNumber] + " years");
                System.out.println( "\n");                
            }
            else if (prisonerAge[cellNumber] <= 70) // prisoner's age is less than or equal to 69
            {
               System.out.println(" Prisoner in cell " + cellNumber + " on good Behaviour will get out in " + remission[cellNumber] );
               System.out.println( "\n");
               System.out.println("Prisoner in cell " + cellNumber +" on bad Behaviour will serve full sentence and a extra "
               + remission[cellNumber] + " years");
               System.out.println( "\n");
            }
        cellNumber++;  
        } // End of while
       
    } // End of method
} // End of class