Conformed to Java conventions and updated all directories of Chapter 7.

src/main/java/chapter07/datetest/DateComparator.java

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+// Code written as part of the Java-Methods-Program-AP-Comp-A-2021-2022 repository on GitHub.
+package chapter07.datetest;
+
+import java.util.Scanner;
+
+public class DateComparator {
+    /**
+     * Compares two dates. No input verification.
+     * @return {@code true} if the first date is strictly later in the year and {@code false} otherwise.
+     */
+    public static boolean isLater(int month1, int day1, int year1, int month2, int day2, int year2) {
+        if (year1 == year2) {
+            if (month1 == month2) {
+                return day1 > day2;
+            }
+            return month1 > month2;
+        }
+        return year1 > year2;
+    }
+
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+
+        System.out.print("Enter the first date (month day year): ");
+        int month1 = scanner.nextInt();
+        int day1 = scanner.nextInt();
+        int year1 = scanner.nextInt();
+
+        System.out.print("Enter the second date (month day year): ");
+        int month2 = scanner.nextInt();
+        int day2 = scanner.nextInt();
+        int year2 = scanner.nextInt();
+
+        System.out.println();  // newline
+
+        String message = month1 + "/" + day1 + "/" + year1 + " ";
+        if (isLater(month1, day1, year1, month2, day2, year2)) {
+			message += "IS";
+		} else {
+			message += "is NOT";
+		}
+        message += " later than " + month2 + "/" + day2 + "/" + year2 + ".";
+        System.out.println(message);
+    }
+}

src/main/java/chapter07/findbestfit/BestFitFinder.java

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+// Code written as part of the Java-Methods-Program-AP-Comp-A-2021-2022 repository on GitHub.
+package chapter07.findbestfit;
+
+import java.util.Scanner;
+
+public class BestFitFinder {
+    public static int findBestFit(int size1, int size2, int space) {
+        int sizeSum = size1 + size2;
+        int returnValue;
+
+        if (sizeSum <= space) {
+            returnValue = 3;
+        } else if (size2 > size1 && size2 <= space) {
+            returnValue = 2;
+        } else if (size1 >= size2 && size1 <= space) {
+            returnValue = 1;
+        } else {
+            returnValue = 0;
+        }
+
+        return returnValue;
+    }
+
+    public static void main(String[] args) {
+        Scanner theScanner = new Scanner(System.in);
+
+        System.out.print("Enter the first file size: ");
+        int size1 = theScanner.nextInt();
+        System.out.print("Enter the second file size: ");
+        int size2 = theScanner.nextInt();
+        System.out.print("Enter the total storage space: ");
+        int space = theScanner.nextInt();
+
+        System.out.println(findBestFit(size1, size2, space));
+    }
+}

src/main/java/chapter07/leapyear/LeapYearChecker.java

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+// Code written as part of the Java-Methods-Program-AP-Comp-A-2021-2022 repository on GitHub.
+package chapter07.leapyear;
+
+import java.util.Scanner;
+
+/**
+ * A class that provides a method that determines if a year is a leap year.
+ */
+public class LeapYearChecker {
+    /**
+     * Determines if the given year is a leap year in the Gregorian calendar.
+     * <p>
+     * Accurate only for positive integers as there is no 0 CE. Since the common era and before it starts at year
+     * 1, negative numbers are not accurately computed as years BCE.
+     *
+     * @param year a positive integer year.
+     * @return {@code true} if it is a leap year in the common era, undefined otherwise.
+     */
+    public static Boolean isLeapYear(int year) {
+        return year % 4 == 0 && (year % 100 != 0 || year % 400 == 0);
+    }
+
+    public static void main(String[] args) {
+        Scanner theScanner = new Scanner(System.in);
+
+        System.out.print("Please input your year: ");
+        int years = theScanner.nextInt();
+        theScanner.close();
+
+        if (isLeapYear(years)) {
+            System.out.println("This is a leap year");
+        } else {
+            System.out.println("This is NOT a leap year");
+        }
+    }
+}