Ejercicio
Tareas de ejercicio
Objetivo
Crea un programa en java que puede almacenar hasta 2000 "tareas pendientes". Para cada tarea, debe conservar los siguientes datos:
• Fecha (un conjunto de 3 datos: día, mes y año)
• Descripción de la tarea
• Nivel de importancia (1 a 10)
• Categoría
El programa debe permitir al usuario las siguientes operaciones:
1 - Añadir una nueva tarea (la fecha debe "parecer correcta": día 1 al 31, mes 1 al 12, año entre 1000 y 3000).
2 - Mostrar las tareas entre dos fechas determinadas (día, mes y año). Si el usuario presiona Intro sin especificar la fecha, se tomará como "hoy". Debe mostrar el número de cada registro, la fecha (DD / MM / AAAA), descripción, categoría e importancia, todo en la misma línea, separado con guiones.
3 - Encuentre tareas que contengan un texto determinado (en descripción o categoría, no distingue entre mayúsculas y minúsculas). Mostrará número, fecha y descripción (solo 50 letras, en caso de que fuera más largo). Se debe notificar al usuario si no se encuentra ninguno.
4 - Actualizar un registro (te pedirá el número, mostrará el valor anterior de cada campo y el usuario podrá pulsar Intro para no modificar ninguno de los datos). Se debe advertir al usuario (pero no se le debe preguntar de nuevo) si ingresa un número de registro incorrecto. No es necesario validar ninguno de los campos.
5 - Eliminar algunos datos, entre dos posiciones indicadas por el usuario. Se debe advertir al usuario (pero no se le debe preguntar de nuevo) si ingresa algún número de registro incorrecto. Cada registro que se elimine debe mostrarse y se debe solicitar al usuario confirmación.
6 - Ordenar los datos alfabéticamente por fecha y (si dos fechas son iguales) por descripción.
7 - Buscar duplicados: Si dos registros tienen la misma descripción, ambos se mostrarán en pantalla.
P - Salir (finalizar la aplicación; como no almacenamos la información, se perderá).
(Sugerencia: puede conocer la fecha actual usando DateTime.Now.Day, DateTime.Now.Month y DateTime.Now.Year).
Código de Ejemplo
import java.util.*;
public class Main
{
private final static class DateType
{
public short year;
public byte month;
public byte day;
public DateType clone()
{
DateType varCopy = new DateType();
varCopy.year = this.year;
varCopy.month = this.month;
varCopy.day = this.day;
return varCopy;
}
}
private final static class TaskType
{
public DateType date = new DateType();
public String description;
public byte level;
public String category;
public TaskType clone()
{
TaskType varCopy = new TaskType();
varCopy.date = this.date.clone();
varCopy.description = this.description;
varCopy.level = this.level;
varCopy.category = this.category;
return varCopy;
}
}
public static void main(String[] args)
{
int capacity = 2000;
TaskType[] tasks = new TaskType[capacity];
char option;
int counter = 0;
String search, newValue;
boolean found;
do
{
System.out.println();
System.out.println("Tasks database");
System.out.println();
System.out.println("1- Add a new task.");
System.out.println("2- Show the tasks between two certain dates.");
System.out.println("3- Find tasks that contain a certain text.");
System.out.println("4- Update a record.");
System.out.println("5- Delete some data, between two positions indicated.");
System.out.println("6- Sort the data alphabetically by date.");
System.out.println("7- Find Duplicates.");
System.out.println("Q- Quit.");
System.out.println("Enter an option:");
option = (char)(new Scanner(System.in).nextLine().toUpperCase());
switch (option)
{
case '1': //Add a new task
if (counter < capacity)
{
System.out.print("Enter the Description of the task: ");
tasks[counter].description = new Scanner(System.in).nextLine();
System.out.print("Enter the Level of the task (1-10): ");
tasks[counter].level = Byte.parseByte(new Scanner(System.in).nextLine());
System.out.print("Enter the Category of the task: ");
tasks[counter].category = new Scanner(System.in).nextLine();
do
{
System.out.print("Enter the Day of the task (1 to 31): ");
tasks[counter].date.day = Byte.parseByte(new Scanner(System.in).nextLine());
if (tasks[counter].date.day < 1 || tasks[counter].date.day > 31)
{
System.out.println("Not a valid day!");
}
} while (tasks[counter].date.day < 1 || tasks[counter].date.day > 31);
do
{
System.out.print("Enter the Month of the task (1 to 12): ");
tasks[counter].date.month = Byte.parseByte(new Scanner(System.in).nextLine());
if (tasks[counter].date.month < 1 || tasks[counter].date.month > 12)
{
System.out.println("Not a valid month!");
}
} while (tasks[counter].date.month < 1 || tasks[counter].date.month > 12);
do
{
System.out.print("Enter the Year of the task: ");
tasks[counter].date.year = Short.parseShort(new Scanner(System.in).nextLine());
if (tasks[counter].date.year < 1000 || tasks[counter].date.year > 3000)
{
System.out.println("Not a valid year!");
}
} while (tasks[counter].date.year < 1000 || tasks[counter].date.year > 3000);
counter++;
}
else
{
System.out.println("Database full.");
}
break;
case '2': //Show the tasks between two certain dates
if (counter >= 1)
{
byte startDay, startMonth;
short startYear;
byte endDay, endMonth;
short endYear;
System.out.println("Starting day: ");
String number = new Scanner(System.in).nextLine();
if (number.equals(""))
{
startDay = (byte)java.time.LocalDateTime.now().getDayOfMonth();
}
else
{
startDay = Byte.parseByte(number);
}
System.out.println("Starting month: ");
number = new Scanner(System.in).nextLine();
if (number.equals(""))
{
startMonth = (byte)java.time.LocalDateTime.now().getMonthValue();
}
else
{
startMonth = Byte.parseByte(number);
}
System.out.println("Starting year: ");
number = new Scanner(System.in).nextLine();
if (number.equals(""))
{
startYear = (short)java.time.LocalDateTime.now().getYear();
}
else
{
startYear = Short.parseShort(number);
}
System.out.println("Final day: ");
number = new Scanner(System.in).nextLine();
if (number.equals(""))
{
endDay = (byte)java.time.LocalDateTime.now().getDayOfMonth();
}
else
{
endDay = Byte.parseByte(number);
}
System.out.println("Final month: ");
number = new Scanner(System.in).nextLine();
if (number.equals(""))
{
endMonth = (byte)java.time.LocalDateTime.now().getMonthValue();
}
else
{
endMonth = Byte.parseByte(number);
}
System.out.println("Final year: ");
number = new Scanner(System.in).nextLine();
if (number.equals(""))
{
endYear = (short)java.time.LocalDateTime.now().getYear();
}
else
{
endYear = Short.parseShort(number);
}
String startDate = "" + startYear + (new Byte(startMonth)).toString("00") + (new Byte(startDay)).toString("00");
String endDate = "" + endYear + (new Byte(endMonth)).toString("00") + (new Byte(endDay)).toString("00");
for (int i = 0; i < counter; i++)
{
String currentDate = "" + tasks[i].date.year + (new Byte(tasks[i].date.month)).toString("00") + (new Byte(tasks[i].date.day)).toString("00");
if (currentDate.compareTo(startDate) >= 0 && currentDate.compareTo(endDate) <= 0)
{
System.out.printf("The number is %1$s: %2$s/%3$s/" + "%4$s - %5$s - %6$s - %7$s." + "\r\n", i + 1, tasks[i].date.day, tasks[i].date.month, tasks[i].date.year, tasks[i].description, tasks[i].category, tasks[i].level);
}
}
}
else
{
System.out.println("Database empty.");
}
break;
case '3': //Find tasks that contain a certain text
if (counter >= 1)
{
System.out.print("Enter the text to search: ");
search = new Scanner(System.in).nextLine();
found = false;
String newValue5;
for (int i = 0; i < counter; i++)
{
if (tasks[i].description.indexOf(search) >= 0 || tasks[i].category.indexOf(search) >= 0)
{
if (tasks[i].description.length() > 50)
{
newValue5 = tasks[i].description.substring(0, 50);
}
else
{
newValue5 = tasks[i].description;
}
found = true;
System.out.printf("%1$s: %2$s/%3$s/%4$s - %5$s" + "\r\n", i + 1, tasks[i].date.day, tasks[i].date.month, tasks[i].date.year, newValue5);
}
}
if (!found)
{
System.out.println("Not found.");
}
}
else
{
System.out.println("Database empty.");
}
break;
case '4': //Update a record
if (counter >= 1)
{
System.out.print("Enter the number of the task to update: ");
int update = Integer.parseInt(new Scanner(System.in).nextLine()) - 1;
if ((update >= 0) && (update < counter))
{
System.out.printf("Description (%1$s): ", tasks[update].description);
newValue = new Scanner(System.in).nextLine();
if (!newValue.equals(""))
{
tasks[update].description = newValue;
}
System.out.printf("Level (%1$s): " + "\r\n", tasks[update].level);
newValue = new Scanner(System.in).nextLine();
if (!newValue.equals(""))
{
tasks[update].level = Byte.parseByte(newValue);
}
System.out.printf("Category (%1$s): " + "\r\n", tasks[update].category);
newValue = new Scanner(System.in).nextLine();
if (!newValue.equals(""))
{
tasks[update].category = newValue;
}
System.out.printf("Year (%1$s): " + "\r\n", tasks[update].date.year);
newValue = new Scanner(System.in).nextLine();
if (!newValue.equals(""))
{
tasks[update].date.year = Short.parseShort(newValue);
}
System.out.printf("Month (%1$s): " + "\r\n", tasks[update].date.month);
newValue = new Scanner(System.in).nextLine();
if (!newValue.equals(""))
{
tasks[update].date.month = Byte.parseByte(newValue);
}
System.out.printf("Day (%1$s): " + "\r\n", tasks[update].date.day);
newValue = new Scanner(System.in).nextLine();
if (!newValue.equals(""))
{
tasks[update].date.day = Byte.parseByte(newValue);
}
}
else
{
System.out.println("Wrong number entered.");
}
}
else
{
System.out.println("Database empty.");
}
break;
case '5': //Delete some data, between two positions indicated by the user
if (counter >= 1)
{
System.out.print("Enter the first number of data to delete: ");
int delete = Integer.parseInt(new Scanner(System.in).nextLine()) - 1;
System.out.print("Enter the second number of data to delete: ");
int delete2 = Integer.parseInt(new Scanner(System.in).nextLine()) - 1;
for (int pos = delete; pos <= delete2; pos++)
{
for (int i = delete; i < counter; i++)
{
tasks[i] = tasks[i + 1].clone();
}
counter--;
}
}
else
{
System.out.println("Database empty.");
}
break;
case '6': //Sort the data alphabetically on date + description
for (int i = 0; i < counter - 1; i++)
{
String firstDate = "" + tasks[i].date.year + (new Byte(tasks[i].date.month)).toString("00") + (new Byte(tasks[i].date.day)).toString("00") + tasks[i].description;
for (int j = i + 1; j < counter; j++)
{
String secondDate = "" + tasks[j].date.year + (new Byte(tasks[j].date.month)).toString("00") + (new Byte(tasks[j].date.day)).toString("00") + tasks[j].description;
if (firstDate.compareTo(secondDate) > 0)
{
TaskType aux = tasks[i].clone();
tasks[i] = tasks[j].clone();
tasks[j] = aux.clone();
}
}
}
break;
case '7': //Find Duplicates
for (int i = 0; i < counter - 1; i++)
{
for (int j = i + 1; j < counter; j++)
{
if (tasks[i].description.equals(tasks[j].description))
{
System.out.printf("%1$s - %2$s/%3$s/%4$s" + "\r\n", tasks[i].description, tasks[i].date.day, tasks[i].date.month, tasks[i].date.year);
System.out.printf("%1$s - %2$s/%3$s/%4$s" + "\r\n", tasks[j].description, tasks[j].date.day, tasks[j].date.month, tasks[j].date.year);
}
}
}
break;
case 'Q': //Quit
System.out.println("Quitting...");
break;
default:
System.out.println("You entered a wrong option. Please re-enter it.");
break;
}
} while (option != 'Q');
}
}