因此，基本上，我正在尝试输出特定年份的顶级电影和该年电影的总收入。我的两种方法均无法正常工作，特别是在获取输入年份以匹配电影中所包含的年份方面，以输出该年的总收入和最佳影片时，我尤其遇到困难。
目前，我的程序输出如下：
** 输入从1991年至2018年的一年：2016年
感谢您收到2016年
2016年的总金额为966.50美元
2016年电影收入最高的电影是《丛林书》，售价$ 966.50 **
但是，2016年的总票房不是966.50美元，而2016年最卖座的电影不是《丛林书》，而是《海底总动员》 ...
这里是getInput.getUserInput()
public static int getUserInput(int minYear, int maxYear) {
int year = 0;
boolean keepLooping = true;
Scanner input = new Scanner(System.in);
while (keepLooping) {
System.out.printf("\nEnter a year from %s - %s:", minYear, maxYear);
year = input.nextInt();
if (year < minYear || year > maxYear) {
System.out.printf("Invalid entry . . .");
} else {
keepLooping = false;
}
}
return year;
}
这是班上
public class Films {
private String filmTitle;
private double filmIncome;
private int premiereYear;
Films(String title, double income, int year) {
filmTitle = title;
filmIncome = income;
premiereYear = year;
}
public String getFilmTitle() {
return filmTitle;
}
public void setFilmTitle(String filmTitle) {
this.filmTitle = filmTitle;
}
public double getFilmIncome() {
return filmIncome;
}
public void setFilmIncome(double filmIncome) {
this.filmIncome = filmIncome;
}
public int getPremiereYear() {
return premiereYear;
}
public void setPremiereYear(int premiereYear) {
this.premiereYear = premiereYear;
}
}
这是运行程序的文件
public static void main(String[] args) {
Films[] f = new Films[8];
f[0] = new Films("Frozen", 1290.0, 2013);
f[1] = new Films("The Lion King", 968.4, 1994);
f[2] = new Films("Zootopia", 1023.7, 2016);
f[3] = new Films("Incredibles 2", 1240.3, 2018);
f[4] = new Films("Finding Dory", 1028.5, 2016);
f[5] = new Films("Shrek 2", 919.8, 2004);
f[6] = new Films("The Jungle Book", 966.5, 2016);
f[7] = new Films("Despicable Me 2", 970.7, 2013);
int yearEntered = getInput.getUserInput(1991, 2018);
System.out.printf("\nThank you received %s", yearEntered);
Films total = getTotalIncome(f, yearEntered);
System.out.printf("\nThe total amount made for %s was $%2.2f", yearEntered, total.getFilmIncome());
Films top = getTopFilm(f, yearEntered);
if (top == null) {
System.out.printf("0");
} else {
System.out.printf("\nThe greatest income made by a movie in %s was %s at $%2.2f", yearEntered,
top.getFilmTitle(), top.getFilmIncome());
}
}
private static Films getTotalIncome(Films[] f, int yearEntered) {
Films totalIncome = null;
double add = 0;
for (int i = 0; i < f.length; i++) {
if (f[i].getPremiereYear() == yearEntered) {
add += f[i].getFilmIncome();
totalIncome = f[i];
}
}
return totalIncome;
}
private static Films getTopFilm(Films[] f, int yearEntered) {
Films topFilm = null;
double max = 0;
for (int i = 0; i < f.length; i++) {
if (f[i].getPremiereYear() != yearEntered) {
continue;
}
if (f[i].getFilmIncome() > max) {
topFilm = f[i];
}
}
return topFilm;
}
答案 0 :(得分：0)
max函数似乎存在错误。
private static Films getTopFilm(Films[] f, int yearEntered) {
Films topFilm = null;
double max = 0;
for (int i = 0; i < f.length; i++) {
if (f[i].getPremiereYear() != yearEntered) {
continue;
}
if (f[i].getFilmIncome() > max) {
topFilm = f[i];
max = f[i].getFilmIncome(); // you forget to set the value of max.
}
}
return topFilm;
}
答案 1 :(得分：0)
public static void main(String[] args) {
Films[] f = new Films[8];
f[0] = new Films("Frozen", 1290.0, 2013);
f[1] = new Films("The Lion King", 968.4, 1994);
f[2] = new Films("Zootopia", 1023.7, 2016);
f[3] = new Films("Incredibles 2", 1240.3, 2018);
f[4] = new Films("Finding Dory", 1028.5, 2016);
f[5] = new Films("Shrek 2", 919.8, 2004);
f[6] = new Films("The Jungle Book", 966.5, 2016);
f[7] = new Films("Despicable Me 2", 970.7, 2013);
int yearEntered = getInput.getUserInput(1991, 2018);
System.out.printf("\nThank you received %s", yearEntered);
Films total = getTotalIncome(f, yearEntered);
System.out.printf("\nThe total amount made for %s was $%2.2f", yearEntered, total.getFilmIncome());
Films top = getTopFilm(f, yearEntered, total.getFilmIncome());
if (top == null) {
System.out.printf("0");
} else {
System.out.printf("\nThe greatest income made by a movie in %s was %s at $%2.2f", yearEntered, top.getFilmTitle(), top.getFilmIncome());
}
}
private static Films getTotalIncome(Films[] f, int yearEntered) {
Films totalIncome = null;
double add = 0;
double max = Double.MIN_VALUE;
for (int i = 0; i < f.length; i++) {
if (f[i].getPremiereYear() == yearEntered && max < f[i].getFilmIncome()) {
max = f[i].getFilmIncome(); totalIncome = f[i];
}
}
return totalIncome;
}
private static Films getTopFilm(Films[] f, int yearEntered,double total) {
Films topFilm = null;
double max = 0;
for (int i = 0; i < f.length; i++) {
if (f[i].getPremiereYear() != yearEntered) {
continue;
}
if (f[i].getFilmIncome() == total) {
topFilm = f[i];
break;
}
}
return topFilm;
}
答案 2 :(得分：0)
像Vivek一样，您在max函数中遇到问题
private static Films getTopFilm(Films[] f, int yearEntered) {
Films topFilm = null;
double max = 0;
for (int i = 0; i < f.length; i++) {
if (f[i].getFilmIncome() > max) {
topFilm = f[i];
//need to reset max here
max = f[i].getFilmIncome();
}
}
return topFilm;
}
但是您的get getTotalIncome方法中也存在一个错误：
private static double getTotalIncome(Films[] f, int yearEntered) {
double total = 0;
for (int i = 0; i < f.length; i++) {
if (f[i].getPremiereYear() == yearEntered) {
total += f[i].getFilmIncome();
}
}
return total;
}
不知道您为什么要从那里返回Film对象，您想要做的是迭代总结那年所有电影的电影。
然后您将编辑您的main函数以这样调用
public static void main(String[] args) {
...
double total = getTotalIncome(f, yearEntered);
System.out.printf("\nThe total amount made for %s was $%2.2f", yearEntered, total);
...
}