我正在使用ArrayList来保存节目的名称，日期和时间。我的节目要求我输出一周中每天播放的节目数量。我已经输入了4个不同的节目，其中两个是在同一天。到目前为止，输出给我的唯一一件事就是“周四有2个节目。”另外两个没有表现出来。我如何才能显示我输入的每一天的节目数量？这是我的代码：
String showDay = ((showInfo)show.get(0)).day.toString();
int totalShows = 0;
//print occurences for how many shows play each day
for (int i = 0; i < show.size(); i++) {
if (showDay.equals(((showInfo)show.get(i)).day.toString())) {
totalShows++;
}
}
System.out.println("On " + showDay + " there are/is " + totalShows + " show(s).");
}
这是我输入的节目的代码：
//input information
do{
showInfo temp = new showInfo();
System.out.print("Enter the name of show: ");
String showName = br.readLine();
temp.name = showName;
System.out.print("Enter which day of the week a new episode premieres: ");
String showDay = br.readLine();
temp.day = showDay;
System.out.print("Enter time in 24-hour format (e.g. 2100, 1900): ");
int showTime = Integer.valueOf(br.readLine()).intValue();
temp.time = showTime;
show.add(temp);
System.out.print("Would you like to add another show? (y/n) ");
}
while((br.readLine().compareTo("n")) != 0);
请记住我正在使用Java 1.4。别无选择。按老师的要求。
这可能是显而易见的，但我现在没有注意到。任何帮助都会很棒！提前谢谢！
修改
String showDay = ((showInfo)show.get(0)).day.toString();
if("sunday".equalsIgnoreCase(showDay)){
showdayCount[0]++;
System.out.println("There are/is " + showdayCount[0]++ + " show on Sunday.");
}else if("monday".equalsIgnoreCase(showDay)){
showdayCount[1]++;
System.out.println("There are/is " + showdayCount[1]++ + " show on Monday.");
}else if("tuesday".equalsIgnoreCase(showDay)){
showdayCount[2]++;
System.out.println("There are/is " + showdayCount[2]++ + " show on Tuesday.");
}else if("wednesday".equalsIgnoreCase(showDay)){
showdayCount[3]++;
System.out.println("There are/is " + showdayCount[3]++ + " show on Wednesday.");
}else if("thursday".equalsIgnoreCase(showDay)){
showdayCount[4]++;
System.out.println("There are/is " + showdayCount[4]++ + " show on Thursday.");
}else if("friday".equalsIgnoreCase(showDay)){
showdayCount[5]++;
System.out.println("There are/is " + showdayCount[5]++ + " show on Friday.");
}else if("saturday".equalsIgnoreCase(showDay)){
showdayCount[6]++;
System.out.println("There are/is " + showdayCount[6]++ + " show on Saturday.");
}
这也只给了我一行。我究竟做错了什么？！ ：（
修改
我想要的是输入电视节目的名称/日期/时间，然后能够显示该特定日期的节目数量！
例如，大爆炸理论和社区都在周四。所以代码会输出像
这样的东西There are 2 shows on Thursday.
到目前为止，没有任何效果。
答案 0 :(得分：0)
你只能从这一行获得一天：
String showDay = ((showInfo)show.get(0)).day.toString();
这是我的黑客解决方案（可能有一些错误，比如错误的变量，但你应该能够解决它）：
//Create a map that maps days to the shows that are on that day
LinkedHashMap showDays=new LinkedHashMap(); //String to Set map
String[] days={"Sunday","Monday", ....};//put the rest of the days in here
for(int dayIndex=0;dayIndex<days.length;dayIndex++){
String day=days[dayIndex];
showDays.put(day,new HashSet());
}
//iterate through the shows and put them in their respective days in the map
for (int i = 0; i < show.size(); i++) {
String dayForShow=((showInfo)show.get(i)).day.toString();
showDays.get(dayForShow).put(show.get(i));
}
//now print out how many shows are on each day
for(int dayIndex=0;dayIndex<days.length;dayIndex++){
String day=days[dayIndex];
int showsToday=showDays.get(day).size();
///do your print out now
}
你可以让'LinkedHashMap showDays'成为一个类变量，并在每次添加到show时添加它（并在每次从show中删除时添加它）。
PS。告诉你的老师它不再是2002年，技术继续发展，他们让我的工作更加努力。
答案 1 :(得分：0)
创建Show类
public class Show {
String showName;
String showDay;
int showTime;
static int[] showdayCount = new int[7];
public Show(String showName, String, showDay, iny showTime){
this.showName = showName;
this.showDay = showDay;
this.showTime = showTime;
// increment showDayCOunt[] according to showDay from
switch(showDay){
case "Sunday": showDayCount[0]++; break;
case "Monday": showDayCount[1]++; break;
case "Tuesday": showDayCount[2]++; break;
case "Wednesday": showDayCount[3]++; break;
case "Thursday": showDayCount[4]++; break;
case "Friday": showDayCount[5]++; break;
case "Saturday": showDayCount[6]++; break;
}
}
}
这是YourClass的主要方法
public static void main(String[] args){
// Create Array of Shows
Show[] shosList = new Show[4]; // or how many ever shows you have
// Get your inputs for showName, showDay, showTime
Sting showName =
String showDay =
int showTime =
// Create show Object
Show show = new Show(showName, showDate, showTime);
// add show to ArrayList
showList[someIndex] = show;
// Do all other stuff then print
// when you print, you can get the showDayCount directly from the Show class
}
现在我不想为你做任何事情。我只想让你朝着正确的方向前进。请注意，如果您希望上述内容多次发生，请考虑放入循环内部。
编辑：使用getShowdayCount
将此添加到我上面的Show class
public int getShowdayCount(String showday){
switch(showDay){
case "Sunday": return showDayCount[0]; break;
case "Monday": return showDayCount[1]; break;
case "Tuesday": return showDayCount[2]++; break;
case "Wednesday": return showDayCount[3]++; break;
case "Thursday": return showDayCount[4]++; break;
case "Friday": return showDayCount[5]++; break;
case "Saturday": return showDayCount[6]++; break;
}
}
修改：使用if/else if语句中的示例switch
// for main method inputs
if ("sunday"equalsIgnoreCase(showDay){
showdayCount[0]++
} else ("monday".equalsIgnoreCase(showDay){
showdayCount[1]++
} // finish if/else if statement
// for getShowdayCount method
if ("sunday"equalsIgnoreCase(showDay){
return showdayCount[0];
} else ("monday".equalsIgnoreCase(showDay){
return showdayCount[1];
} // finish if/else if statement
您可以从main类这样的
show.getShowdayCount(show.showday);
编辑：实际上，只需使用main方法将上述编辑内容放入您的课程
YourClassWithMainMethod{
static int[] showdayCount = new int[7];
public static void mina(String[] args){
// call getShowdayCount here
getShowdayCount(String showday);
}
public static int getShowdayCount(String showday){
}
}
编辑：您想要什么以及您不想要什么
如果声明
，你不需要这个 System.out.println("There are/is " + showdayCount[5]++ + " show on Friday.");
如果要打印所有节目：
for (int i = 0; i < showdayCount.length; i++){
int showday;
if (i == 0){
showday = "Sunday
finish the if/else if statements
}
System.out.println("There is " + showDayCount[i] + " shows on " + showday);
}