Finish up to end of Lab 4

Skips labs 1-3, did them in eclipse which failed to save to OneDrive (!)

Implements Lab and Section classes for more easily and consistently running
particular labs.

week1.java

@@ -0,0 +1,208 @@
+import java.util.Calendar;
+import java.util.concurrent.ThreadLocalRandom;
+
+class runLabs {
+    public static void main(String[] args) {
+        new Lab4();
+        new Lab5();
+    }
+}
+
+class Section {
+    private int _sectionNumber;
+
+    public Section(int s) {
+        this._sectionNumber = s;
+    }
+
+    public int getSection() {
+        return _sectionNumber;
+    }
+}
+
+class Lab {
+
+    private int _labNumber;
+    public Section currentSection;
+
+    public Section getCurrentSection() {
+        return currentSection;
+    }
+
+    public void setCurrentSection(Section currentSection) {
+        this.currentSection = currentSection;
+    }
+
+    public static void printSection(String section) {
+        String title = String.format("Starting section %s", section);
+
+        System.out.println("-".repeat(title.length()));
+        System.out.println(String.format("%s", title));
+        System.out.println("-".repeat(title.length()));
+    }
+
+    public Lab(int lN) {
+        String title = String.format("|Starting Lab %s|", lN);
+        this._labNumber = lN;
+
+        System.out.println("*".repeat(title.length()));
+        System.out.println(title);
+        System.out.println("*".repeat(title.length()));
+    }
+
+    public int getLabNumber() {
+        return this._labNumber;
+    }
+}
+
+class Lab4 extends Lab {
+    public Lab4() {
+        super(4);
+        ex44();
+        ex46();
+    }
+
+    // public static void main(String[] args) {
+    // }
+
+    public static void ex41() {
+        String labSection = "4.1";
+        // System.out.println(String.format("Starting section %s", labSection));
+        printSection(labSection);
+
+        int testYear1 = 1996; // true
+        int testYear2 = 1997; // false
+        int testYear3 = 2000; // true
+        int testYear4 = 9332; // true
+        int testYear5 = 1900; // false
+
+        int randomYear = ThreadLocalRandom.current().nextInt(1, 9999 + 1);
+
+        System.out.println(String.format("Testing %s", testYear1));
+        System.out.println(String.format("%s", isLeap(testYear1)));
+
+        System.out.println(String.format("Testing %s", testYear2));
+        System.out.println(String.format("%s", isLeap(testYear2)));
+
+        System.out.println(String.format("Testing %s", testYear3));
+        System.out.println(String.format("%s", isLeap(testYear3)));
+
+        System.out.println(String.format("Testing %s", testYear4));
+        System.out.println(String.format("%s", isLeap(testYear4)));
+
+        System.out.println(String.format("Testing %s", randomYear));
+        System.out.println(String.format("%s", isLeap(randomYear)));
+
+        System.out.println(String.format("Testing %s", testYear5));
+    }
+
+    public static void ex44() {
+        String labSection = "4.4";
+        printSection(labSection);
+
+        // System.out.println("------------------------");
+        // System.out.println("Starting lab section " + labSection);
+        // System.out.println("------------------------");
+
+        String month1 = "oct";
+        int year1 = 2000;
+        System.out.println(String.format("Month: %s\tYear: %d\tDays in month: %d",
+                                         month1, year1, monthLen(month1, year1)));
+
+        String month2 = "feb";
+        int year2 = 2000;
+        System.out.println(String.format("Month: %s\tYear: %d\tDays in month: %d",
+                                         month2, year2, monthLen(month2, year2)));
+
+        String month3 = "feb";
+        int year3 = 1997;
+        System.out.println(String.format("Month: %s\tYear: %d\tDays in month: %d",
+                                         month3, year3, monthLen(month3, year3)));
+
+        String month4 = "apr";
+        int year4 = 2001;
+        System.out.println(String.format("Month: %s\tYear: %d\tDays in month: %d",
+                month4, year4, monthLen(month4, year4)));
+
+    }
+
+    /**
+     * Lab section 4.5
+     *
+     * Write a program that can calculate how many whole years old someone is from
+     * today’s date and their date of birth. You could store each date as three
+     * integers (day,
+     * month, year)
+     */
+    public static void ex46() {
+        String labSection = "4.6";
+        printSection(labSection);
+        // calculate whole years' old to date
+
+        Calendar today = Calendar.getInstance();
+        System.out.println("Today:\t" + today.getTime());
+
+        Calendar dob1 = Calendar.getInstance();
+        dob1.set(1990, 1, 1);
+
+        System.out.println(String.format(
+                "DOB 1:\t%s (difference:\t%d years)",
+                                         dob1.getTime(),
+                                         yearDifference(today, dob1)));
+
+        Calendar dob2 = Calendar.getInstance();
+        dob2.set(1994, 12, 22);
+
+        System.out.println(String.format(
+                "DOB 2:\t%s (difference:\t%d years)",
+                                         dob2.getTime(),
+                                         yearDifference(today, dob2)));
+    }
+
+    public static boolean isLeap(int year) {
+        if (year % 4 != 0) {
+            return false;
+        } else {
+            if (year % 100 == 0) {
+                if (year % 400 == 0) {
+                    return true;
+                } else {
+                    return false;
+                }
+            }
+            return true;
+        }
+    }
+
+    public static int monthLen(String month, int year) {
+        if (month == "feb") {
+            if (isLeap(year)) {
+                return 29;
+            } else {
+                return 28;
+            }
+        } else if (
+            (month == "apr") ||
+            (month == "jun") ||
+            (month == "sep") ||
+            (month == "nov")) {
+                return 30;
+        } else {
+            return 31;
+        }
+    }
+
+    public static int yearDifference(Calendar date1, Calendar date2)
+    {
+        return (int) Math.abs(date1.get(Calendar.YEAR) -
+                              date2.get(Calendar.YEAR)
+                              );
+    }
+}
+
+class Lab5 extends Lab {
+    public Lab5() {
+        super(5);
+        System.out.println(String.format("hi"));
+    }
+}