inital commit

Lab09/src/Date.java

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+/*
+ * Copyright (C) 2020 Gabriel Venberg
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/**
+ *
+ * @author toric
+ */
+import java.util.GregorianCalendar;
+import java.util.Calendar;
+public class Date {
+    private int day, month, year;
+    
+    public Date (int startDay, int startMonth, int startYear){
+        setYear(startYear);
+        setMonth(startMonth);
+        setDay(startDay);
+    }
+    /**
+     * returns day
+     * @return 
+     */
+    public int getDay(){
+        return day;
+    }
+    /**
+     * returns month
+     * @return 
+     */
+    public int getMonth(){
+        return month;
+    }
+    /**
+     * returns year
+     * @return 
+     */
+    public int getYear(){
+        return year;
+    }
+    
+    /**
+     * sets the day, throws error if day is impossible under the gregorian calander.
+     * @param newDay 
+     */
+    private void setDay(int newDay){
+        GregorianCalendar checker = new GregorianCalendar(year, month, day);
+        //found in javadoc for gregoriancalander. will also take into account leap years.
+        int daysInMonth = checker.getActualMaximum(Calendar.DAY_OF_MONTH);
+        
+        if (newDay<=daysInMonth){
+            day=newDay;
+        }
+        else {
+            throw new IllegalArgumentException("newDay out of range for set month and year");
+        }
+    }
+    /**
+     * sets month, throws error if month is above 12.
+     * @param newMonth 
+     */
+    private void setMonth(int newMonth){
+        if (newMonth<=12){
+            month=newMonth;
+        }
+        else {
+            throw new IllegalArgumentException("newMonth must be <= 12");
+        }
+    }
+    /**
+     * sets year, returns error if year is before 1582
+     * @param newYear 
+     */
+    private void setYear(int newYear){
+        if (newYear>=1582){
+            year=newYear;
+        }
+        else {
+            throw new IllegalArgumentException("newYear must be >= 1582, the year the gregorian calander was adopted.");
+        }
+    }
+    
+    /**
+     * outputs a string representation of the date in mm/dd/yyyy format.
+     * @return 
+     */
+    public String toString(){
+        return (month+"/"+day+"/"+year);
+    }
+    
+    /**
+     * tests if date obgect is equal to another date object.
+     * @param testDate
+     * @return 
+     */
+    public boolean equals(Date testDate){
+       return  testDate.getDay()==day&testDate.getMonth()==month&testDate.getYear()==year;
+    }
+    
+    
+}