Writing Classes

KyoGaSuki <jrockgadaisukidayou@yahoo.co.jp>
Tue, 22 Apr 2008 10:22:26 -0700 (PDT)
(I should start making an ebook based on all of the help you have
given me so far, thank you all) So -- classes...oh joy...joy...I was
just having trouble with methods...now classes? I look at
examples...I look at them until my brain hurts...I just can't seem to
follow them far. For example, I was looking at an example about a
clock (where you go in and set it, ect)...but then the variable "min"
became "minutes" and then it became "min" again, and I think
eventually it was "min = temp.min" ...I was already confused prior to
that, but that just finished me off ...that, and the comments
definitely didn't help...*defeated* eh, why not -- I guess I will
post the example here anyways. I have a complete arsenal of ebooks on
JAVA at my disposal...but there is so many of them...does anyone have
any suggestions to which explains writing classes the easiest?


 * @(#)Clock.java
 * Clock application
 * @author
 * @version 1.00 2008/4/1

public class Clock {

    private int hr; //store hours
    private int min; //store min
    private int sec; //store sec

//Default constructor
//Postcondition: hr = 0; min = 0; sec = 0
    public Clock() {
//Constructor with parameters, to set the time
//The time is set according t the parameters
//Postcondition: hr = hours; min = minutes; sec = seconds
    public Clock(int hours, int minutes, int seconds) {
        setTime(hours,minutes, seconds);
//Method to set the time
//the time is set according to the parameteres
//Postcondition: hr = hours; min = minutes; sec = seconds
    public void setTime(int hours, int minutes, int seconds) {
        if(0 <= hours && hours < 24)
            hr = hours;
            hr = 0;
        if(0 <=minutes && minutes < 60)
            min = minutes;
            min = 0;
        if(0 <= seconds && seconds < 60)
            sec = seconds;
            sec = 0;
//Method to return the hours
//Postcondition: The value of hr is returned
    public int getHours(){
        return hr;
//Method to return the minutes
//Postcondition: The value of min is returned.
    public int getMinutes() {
        return min;
//Method to return the seconds
//Postcondition: The value of sec is returned.
    public int getSeconds() {
        return sec;
//Method to print the time
//Postcondition: Time is printed in the form hh:mm:ss
    public void printTime() {
        System.out.print(hr + ":");
        if(min < 10)
            System.out.print(min + ":");
        if(sec <10)
//Method to increment the time by one second
//Postcondition: The time is incremented by one second
//If the before-increment time is 23:59:59, the time
//is reset to 00:00:00.
    public void incrementSeconds() {
    if (sec>59)
        sec = 0;
        incrementMinutes(); //increment minutes

//Method to increment the time by one minute
//Postcondidtion: The time is incremented by one minute.
//If the before-increment time is 23:59:53, the time
//is reset to 00:00:53.
    public void incrementMinutes() {

            incrementHours(); //increment hours
//Method to increment the time by one hour
//Postcondition: The time is incremented by one hour.
//If the before-increment time is 23:45:53, the time
//is reset to 00:45:53.
    public void incrementHours() {

//Method to compare the two times
//Postcondition: Returns true if time is equal to
// otherClock; otherwise returns false.
    public boolean equals(Clock otherClock) {
        return (hr==otherClock.hr
            &&min == otherClock.min
            &&sec == otherClock.sec);
//Method to copy the time
//Postcondition: The instance variables of otherClock are
// copied into the corresponding data members
// of this time.
// hr = otherClock.hr; min = otherClock.min;
// sec = otherClock.sec.
    public void makeCopy(Clock otherClock){
        hr = otherClock.hr;
        min = otherClock.min;
        sec = otherClock.sec;
//Method to return a copy of the time
//Postcondition: A copy of the object is created
// and a reference of the copy is returned.
    public Clock getCopy() {
        Clock temp= new Clock();

        temp.hr = hr;
        temp.min = min;
        temp.sec = sec;

        return temp;

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