Added files

.gitignore

@@ -0,0 +1,2 @@
+/HW1.zip
+/HW1.pdf

prog/Date.java

@@ -0,0 +1,51 @@
+// The Date class that represents dates
+// Do not make any changes to this file!
+// Xiwei Wang
+
+import java.io.*;
+
+public class Date implements Serializable
+{
+    // instance variables
+    protected int m_year;
+    protected int m_month;
+    protected int m_day;
+    
+    // copy constructor
+    public Date(Date o)
+    {
+        m_year = o.m_year;
+        m_month = o.m_month;
+        m_day = o.m_day;
+    }
+    
+    // constructor
+    public Date(int month, int day, int year)
+    {
+        m_year = year;
+        m_month = month;
+        m_day = day;
+    }
+    
+    // observers
+    public int getYear()
+    {
+        return m_year;
+    }
+    
+    public int getMonth()
+    {
+        return m_month;
+    }
+    
+    public int getDay()
+    {
+        return m_day;
+    }
+    
+    // return this date as a String
+    public String toString()
+    {
+        return (m_month + "/" + m_day + "/" + m_year);
+    }
+}

prog/IncDate.java

@@ -0,0 +1,23 @@
+// The IncDate class
+// Do not make changes to anything other than the body of increment() method
+// Your name here
+
+public class IncDate extends Date
+{
+    // copy constructor
+    public IncDate(Date o)
+    {
+        super(o.m_month, o.m_day, o.m_year);
+    }
+
+    // constructor
+    public IncDate(int month, int day, int year)
+    {
+        super(month, day, year);
+    }
+
+    public void addDays(int numDays)
+    {
+        // TODO: implement this method
+    }
+}

prog/TestIncDate.java

@@ -0,0 +1,48 @@
+// Test driver for the IncDate class
+// Do not make any changes to this file!
+// Xiwei Wang
+
+import java.util.*;
+import java.io.*;
+
+public class TestIncDate
+{
+    public static void main(String[] args)
+    {   
+        try
+        {
+            ObjectInputStream in = new ObjectInputStream(new FileInputStream("testDates.dat"));
+            ArrayList<Date> oldDates;
+            ArrayList<Integer> daysList;
+            ArrayList<Date> newDates;
+            oldDates = (ArrayList<Date>)in.readObject();
+            daysList = (ArrayList<Integer>)in.readObject();
+            newDates = (ArrayList<Date>)in.readObject();
+
+            IncDate myDate;
+            int numCorrect = 0;
+
+            for (int i = 0; i < oldDates.size(); i++)
+            {
+                System.out.println("The current date is " + oldDates.get(i) + " and " + daysList.get(i) + " days are added.");
+                myDate = new IncDate(oldDates.get(i));
+                myDate.addDays(daysList.get(i));
+                System.out.println("The correct new date is " + newDates.get(i) + " and the one calculated by your program is " + myDate + ".");
+
+                if (myDate.toString().equals(newDates.get(i).toString()))
+                {
+                    System.out.println("Correct!\n");
+                    numCorrect++;
+                }
+                else
+                    System.out.println("Wrong!\n");
+            }
+
+            System.out.println("Total test cases: " + oldDates.size() + "\nCorrect: " + numCorrect + "\nWrong: " + (oldDates.size() - numCorrect));
+        }
+        catch (Exception e)
+        {
+           System.out.println("Error occurred: " + e.getMessage());
+        }
+    }
+}