2. Time and Date Class

import java.util.Date;

public class DateClass {


    private int hours;
    private int minutes;
    private int seconds;


    // GETTERS, SETTERS
    public void setHours(int h){
        this.hours = h;
    }
    public void setMinutes(int m){
        this.minutes = m;
    }
    public void setSeconds(int s){
        this.seconds = s;
    }
    public int getHours(){
        return this.hours;
    }
    public int getMinutes(){
        return this.minutes;
    }
    public int getSeconds(){
        return this.seconds;
    }



    // CONSTRUCTORS
    public DateClass(int h, int m, int s){
        setHours(h);
        setMinutes(m);
        setSeconds(s);
    }
    public DateClass(int h, int m){
        this(h, m, 0);
    }
    public DateClass(int h){
        this(h, 0, 0);
    }
    public DateClass(){
        this(0, 0, 0);
    }



    // METHODS
    public void setTime(int h, int m, int s){
        this.hours = ((h>=0 && h<24) ? h : 0);
        this.minutes = ((m>=0 && m<60) ? m : 0);
        this.seconds = ((s>=0 && s<60) ? s : 0);
    }

    public String toMilitary(){
        return String.format("%02d : %02d : %02d", this.hours, this.minutes, this.seconds);
    }

    public String toOrdinary(){
        return String.format("%d : %02d : %02d %s", this.hours % 12, this.minutes, this.seconds, (this.hours >= 12 ? "AM" : "PM"));
    }

    public static void main(String args[]){
        System.out.println("Checking military and ordinary hours");
        DateClass dateclass = new DateClass();
        String str01 = dateclass.toMilitary();
        String str02 = dateclass.toOrdinary();
        System.out.println(str01);
        System.out.println(str02);
        dateclass.setTime(4, 23, 18);
        String str11 = dateclass.toMilitary();
        String str12 = dateclass.toOrdinary();
        System.out.println(str11);
        System.out.println(str12);
        dateclass.setTime(16, 23, 18);
        String str21 = dateclass.toMilitary();
        String str22 = dateclass.toOrdinary();
        System.out.println(str21);
        System.out.println(str22);
        System.out.println();
        System.out.println();

        DateClass d1 = new DateClass();
        DateClass d2 = new DateClass(14);
        DateClass d3 = new DateClass(14, 15);
        DateClass d4 = new DateClass(14, 15, 16);
        System.out.println(d1.toMilitary());
        System.out.println(d2.toMilitary());
        System.out.println(d3.toMilitary());
        System.out.println(d4.toMilitary());
    }
}