labexercises2324/week1.java

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"));
    }
}