[英]Constructor, Setter, Getter issue in an object creation
我正在基於多個變量來創建汽車制造類,例如年份(annee),品牌(marque),顏色(couleur)里程表(kilometrage),已售出(vendue),變速器(automatique),評論(commentaire)和編號門(nbrPortes)。
代碼中的參數是法語的,因為我在法國的一所大學,所以請多多包涵。
我的代碼需要完全符合設置器,構造器和克隆器方法的要求(強制)。 我自己做吸氣劑,並自己增加了IDnumber和compteurvendue(售出汽車的數量)。
這是我的代碼:
public class Automobile {
private static final String[] COULEURS = { "Autre", "Noir", "Blanc", "Bleu Nuit", "Bleu Clair", "Vert Pomme", "Vert Bouteille", "Taupe", "Argent", "Sable", "Gris Charbon", "Gris Clair", "Orange", "Rouge", "Jaune", "Brun" };
private static final String[] MARQUES = { "Autre", "Mazda", "Toyota", "Ford", "GM", "Hyunday", "BMW", "SAAB", "Honda", "Mitsubishi", "Mercedes", "KIA", "Wolkswagen"};
public static final int COULEUR_DEF = 8;
public static final int COULEUR_MIN = 0;
public static final int COULEUR_MAX = COULEURS.length - 1;
public static final int MARQUE_DEF = 4;
public static final int MARQUE_MIN = 0;
public static final int MARQUE_MAX = MARQUES.length - 1;
public static final double KILO_DEFAUT = 55000;
public static final double KILO_MIN = 15000;
public static final double KILO_MAX = 140000;
public static final int DEUX_PORTES = 2;
public static final int QUATRE_PORTES = 4;
public static final int PORTES_DEFAUT = QUATRE_PORTES;
public static final boolean AUTO_DEF = true;
public static final int ANNEE_MIN = 1997;
public static final int ANNEE_MAX = 2016;
public static final int ANNEE_DEFAUT = 2007;
public static final String COMM_DEFAUT = "";
public static final boolean VENDUE_DEF = false;
//private variables
private int marque;
private int annee;
private int couleur;
private boolean a;
private boolean automatique;
private double k;
private double kilometrage;
private int p;
private int nbrPortes;
private String c;
private String commentaire;
private boolean v;
private boolean vendue;
private int compteurvendue = 0;
private int IDnumber = 0;
// CONSTRUCTORS. I do not know I have to make 2, I am thinking for the purpose of the cloning without copying certain variables? I'm confused about this.
public Automobile (int marque, int annee, int couleur, boolean automatique, double kilometrage) {
if (marque>= MARQUE_MIN && marque <= MARQUE_MAX) {
this.marque = marque;
} else {
this.marque = MARQUE_DEF;
}
if (annee>= ANNEE_MIN && annee <= ANNEE_MAX) {
this.annee = annee;
} else {
this.annee = ANNEE_DEFAUT;
}
if (couleur>= COULEUR_MIN && couleur <= COULEUR_MAX) {
this.couleur = couleur;
} else {
this.couleur = COULEUR_DEF;
}
if (a == true || a == false) {
this.automatique = a;
} else {
this.automatique = AUTO_DEF;
}
if (k >= KILO_MIN && k <= KILO_MAX) {
this.kilometrage = k;
} else {
this.kilometrage = KILO_DEFAUT;
}
this.IDnumber = IDnumber + 1;
}
public Automobile (int marque, int annee, int couleur, boolean automatique, double kilometrage,
int nbrPortes, String commentaire, boolean vendue){
if (marque>= MARQUE_MIN && marque <= MARQUE_MAX) {
this.marque = marque;
} else {
this.marque = MARQUE_DEF;
}
if (annee>= ANNEE_MIN && annee <= ANNEE_MAX) {
this.annee = annee;
} else {
this.annee = ANNEE_DEFAUT;
}
if (couleur>= COULEUR_MIN && couleur <= COULEUR_MAX) {
this.couleur = couleur;
} else {
this.couleur = COULEUR_DEF;
}
if (a == true || a == false) {
this.automatique = a;
} else {
this.automatique = AUTO_DEF;
}
if (k >= KILO_MIN && k <= KILO_MAX) {
this.kilometrage = k;
} else {
this.kilometrage = KILO_DEFAUT;
}
if (p == DEUX_PORTES || p == QUATRE_PORTES) {
this.nbrPortes = p;
} else {
this.nbrPortes = PORTES_DEFAUT;
}
if (c != "") {
this.commentaire = c;
} else {
this.commentaire = COMM_DEFAUT;
}
if (v == true || v == false) {
this.vendue = v;
} else {
this.vendue = VENDUE_DEF;
}
this.IDnumber = IDnumber + 1; //The problem is that the IDnumber is 1 for every new instance I create, wether I have the this. in front or not.
}
//HERE I AM SUPPOSED TO PUT IN A CLASS GETTER...I have not managed to make it work in any way
public static Automobile getAutomobile() {
return null; //just put a null return in the meantime so I can compile
}
//GETTERS
public int getAnnee() {
return annee;
}
public int getMarque() {
return marque;
}
public int getCouleur() {
return couleur;
}
public int getNbrPortes() {
return p;
}
public double getKilometrage() {
return k;
}
public boolean getVendue() {
return v;
}
public String getCommentaire() {
return c;
}
public boolean getAutomatique() {
return a;
}
//Setters. According to the imposed settings, Not supposed to have any error message or correction in case of wrong input, it just goes right through?
public void setAnnee ( int annee ) {
//A COMPLETER
if (annee >= ANNEE_MIN && annee <= ANNEE_MAX) {
this.annee = annee;
}
}
public void setMarque (int marque){
//A COMPLETER
if (marque >= MARQUE_MIN && marque <= MARQUE_MAX) {
this.marque = marque;
}
}
public void setCouleur (int couleur) {
//A COMPLETER
if (couleur >= COULEUR_MIN && couleur <= COULEUR_MAX){
this.couleur = couleur;
}
}
public void setNbrPortes (int p) {
//A COMPLETER
if (p == DEUX_PORTES || p == QUATRE_PORTES){
this.p = p;
}
}
public void setKilometrage (double k) {
//A COMPLETER
if (k >= KILO_MIN && k <= KILO_MAX) {
this.k = k;
}
}
// This is supposed to count if I select a car as sold, and counts how many are sold in total (So I can later show it to the user)
public void setVendue (boolean v) {
if (v == true || v == false) {
this.v = v;
}
if (v = true) {
compteurvendue = compteurvendue + 1;
}
}
//Sets comment as long as it is not null
public void setCommentaire (String c){
if (c != null) {
this.c = c;
}
}
public void setAutomatique (boolean a){
if (a == true || a == false) {
this.a = a;
}
}
//Supposed to be able to create a clone of the car with all the same variables except the comment and sold that are reverted to default, and the IDnumber which will be a new one (+1)
public Automobile cloner () {
Automobile Clone = new Automobile(marque,annee,couleur,a,k,p,COMM_DEFAUT,VENDUE_DEF);
return Clone;
}
} // Automobile
我的代碼有多個部分當前無法正常工作:
當我在BlueJ環境中測試汽車時,第一個Automobile構造函數會接受我的變量輸入,但是布爾值(vendue和automatique)始終以FALSE形式出現,注釋始終以COMM_DEFAUT形式(空字符串“”)出現。
第二個構造函數將實例中的所有內容都作為默認值顯示出來,即使我輸入了有效值也是如此。 布爾值和注釋仍然存在相同的問題。
我不明白如何創建“類獲取器” ...在這種情況下其目的是什么
IDnumber始終顯示為1。在創建每個新對象之間,它不會保存在內存中。
我感覺自己的克隆器方法正確,但是我無法調用它或對其進行測試以甚至無法創建DEFAULT汽車。
***請記住,除了私有變量和getter方法之外,所有設置方法,構造方法,最終變量和克隆器標頭的標頭都是強制性的,無法修改(這使這變得更加困難) 。
如何解決我的代碼遇到的這些不同問題? 非常感謝您,因為這個社區已經非常有用!
第一個構造函數自動生成和注釋:存在拼寫錯誤或復制/粘貼問題:)
if (a == true || a == false) {
**this.automatique = a;**
} else {
this.automatique = AUTO_DEF;
}
尖線是什么? 實際上等於
this.automatique = this.a;
不是構造函數的自動參數。
那么,為什么要完全擁有兩個變量a和automatique呢? (其他人也一樣)。 然后
if (a == true || a == false)
完全沒有意義 布爾值a只能是true或false,那么if的結果是什么?
因此,刪除不需要的重復變量。 然后走這種模式:
// holder
private int marque;
//constructor: sure there will be all other parameters as well
public Automobile (int marque)
{
//if it is needed to check between MIN and MAx do it as in your code. (not for boolean :) )
this.marque = marque;
}
// getter
public int getMarque()
{
return this.marque;
}
// setter
public void setMarque(int marque)
{
//if it is needed to check between MIN and MAx do it as in your code.
this.marque = marque;
}
// cloner
public Automobile clone()
{
// sure there will be all other parameters and logic as well
Automobile clonedAuto = new Automobile(this.marque);
return clonedAuto;
}
而已。
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.