[POO] aula05 ex1 added
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TiagoRG
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DFCD48E3F420DB42
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@ -0,0 +1,147 @@
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package aula05;
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import java.util.Scanner;
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public class DateYMD {
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static boolean validMonth(int month) {
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return month >= 1 && month <= 12;
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}
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static int monthDays(int month, int year) {
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if (!validMonth(month))
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return -1;
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int[] daysPerMonth = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
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if (month == 2 && isLeapYear(year))
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return 29;
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return daysPerMonth[month - 1];
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}
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static boolean isLeapYear(int year) {
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return year % 100 == 0 ? year % 400 == 0 : year % 4 == 0;
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}
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static boolean validDate(int day, int month, int year) {
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return day >= 1 && day <= monthDays(month, year);
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}
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class Date {
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private int day;
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private int month;
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private int year;
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public Date(int day, int month, int year) {
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if (!validDate(day, month, year))
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throw new IllegalArgumentException("Invalid date");
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this.day = day;
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this.month = month;
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this.year = year;
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}
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public void set(int day, int month, int year) {
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if (!validDate(day, month, year))
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throw new IllegalArgumentException("Invalid date");
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this.day = day;
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this.month = month;
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this.year = year;
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}
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public int getDay() {
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return day;
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}
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public int getMonth() {
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return month;
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}
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public int getYear() {
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return year;
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}
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public void increment() {
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if (this.day < monthDays(this.month, this.year))
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this.day++;
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else if (this.month < 12) {
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this.day = 1;
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this.month++;
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} else {
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this.day = 1;
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this.month = 1;
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this.year++;
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}
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}
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public void decrement() {
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if (this.day > 1)
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this.day--;
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else if (this.month > 1) {
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this.day = monthDays(this.month - 1, this.year);
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this.month--;
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} else {
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this.day = 31;
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this.month = 12;
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this.year--;
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}
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}
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public String toString() {
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return String.format("%04d-%02d-%02d", year, month, day);
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}
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}
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}
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class TestDateYMD {
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public static void main(String[] args) {
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Scanner sin = new Scanner(System.in);
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DateYMD.Date date = null;
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while (true) {
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System.out.println("Date operations:");
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System.out.println("1 - Create date");
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System.out.println("2 - Show current date");
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System.out.println("3 - Increment date");
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System.out.println("4 - Decrement date");
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System.out.println("0 - Exit");
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System.out.print("Option: ");
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int option = sin.nextInt();
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if (option == 0)
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break;
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switch (option) {
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case 1:
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System.out.print("Day: ");
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int day = sin.nextInt();
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System.out.print("Month: ");
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int month = sin.nextInt();
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System.out.print("Year: ");
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int year = sin.nextInt();
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date = new DateYMD().new Date(day, month, year);
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System.out.println("Date created: " + date);
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break;
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case 2:
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if (date == null) {
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System.out.println("Date not created");
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break;
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}
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System.out.println("Current date: " + date);
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break;
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case 3:
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if (date == null) {
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System.out.println("Date not created");
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break;
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}
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date.increment();
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System.out.println("Date incremented: " + date);
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break;
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case 4:
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if (date == null) {
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System.out.println("Date not created");
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break;
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}
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date.decrement();
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System.out.println("Date decremented: " + date);
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break;
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default:
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System.out.println("Invalid option");
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}
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}
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sin.close();
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}
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}
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@ -6,9 +6,9 @@
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* [Slides](https://github.com/TiagoRG/uaveiro-leci/tree/master/1ano/2semestre/poo/slides/POO_04_Herança.pdf)
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### Exercise List
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| Exercise Number | File Name |
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|-----------------|----------------------------------------------------------------------------------------------------------------------|
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| | |
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| Exercise Number | File Name |
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|-----------------|----------------------------------------------------------------------------------------------------------------|
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| 1 | [DateYMD.java](https://github.com/TiagoRG/uaveiro-leci/blob/master/1ano/2semestre/poo/src/aula05/DateYMD.java) |
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---
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*Pode conter erros, caso encontre algum, crie um* [*ticket*](https://github.com/TiagoRG/uaveiro-leci/issues/new)
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