我是 Java 的新手，我目前正在做一項作業，我在其中創建一個數組列表來存儲用戶輸入的星期幾和每日溫度。我在創建一個條件語句時遇到困難，該條件語句將打印輸入的天數+溫度表，以及用戶輸入單詞“周”時的平均溫度。我已經能夠打印所有這些信息，但這是我正在努力處理的條件語句。我已經嘗試使用 if-else 和 do-while 循環來創建條件，但是我繼續遇到錯誤，或者例如使用下面的代碼，如果輸入“week”，則不會發生任何事情。我一直在使用“days.equals”，但我相信這是我可能出錯的地方。 ArrayList<String> days = new ArrayList<String>(); ArrayList<Double> temp = new ArrayList<Double>(); days.add("Monday"); days.add("Tuesday"); days.add("Wednesday"); days.add("Thursday"); days.add("Friday"); days.add("Saturday"); days.add("Sunday"); Scanner scnr = new Scanner(System.in); System.out.println("Please enter the temperature for Monday through Sunday below.\n" ); for (int i = 0;i < 7; i++) { // Loop 7 times for each day of the week System.out.print("Enter day of week: "); days.add(scnr.next()); System.out.print("Enter temperature: "); temp.add(scnr.nextDouble()); } System.out.println("-----------------------------"); System.out.println("Day\t" + "\tTemperature"); System.out.println("-----------------------------"); for(int i = 0; i < 7; i++) { System.out.println(days.get(i)); System.out.print("\t" + "\t"); System.out.println(temp.get(i)); } double sum = 0.0; for ( int i = 0; i < temp.size(); i++) { sum += temp.get(i); } double average = (double) sum / temp.size(); do { System.out.println("\n" + "Average temperature = " + average); } while(days.equals("Week")); } }我希望程序在用戶輸入單詞“周”時輸出以下內容。-----------------------Day Temperature-----------------------Monday 90.0Tuesday 94.0Wednesday 89.0Thursday 84.0Friday 82.0Saturday 85.0Sunday 88.0Average temperature = 87.42857142857143
1 回答
慕姐8265434
TA貢獻1813條經驗 獲得超2個贊
如果我正確理解您的問題，那么您需要做的是在獲得幾天的溫度后等待用戶輸入，檢查該值是否為“周”，然后才打印您的值。以下內容應該有效。
ArrayList<String> days = new ArrayList<String>();
ArrayList<Double> temp = new ArrayList<Double>();
days.add("Monday");
days.add("Tuesday");
days.add("Wednesday");
days.add("Thursday");
days.add("Friday");
days.add("Saturday");
days.add("Sunday");
Scanner scnr = new Scanner(System.in);
System.out.println("Please enter the temperature for Monday through
Sunday below.\n" );
for (int i = 0;i < 7; i++) { // Loop 7 times for each day of the week
System.out.print("Enter day of week: ");
days.add(scnr.next());
System.out.print("Enter temperature: ");
temp.add(scnr.nextDouble());
}
// You ask for user input here
System.out.print("Enter 'week' here to see temperature details: ");
String userChoice = scnr.next();
while ("week".equalsIgnoreCase(userChoice)) {
System.out.println("-----------------------------");
System.out.println("Day\t" + "\tTemperature");
System.out.println("-----------------------------");
for(int i = 0; i < 7; i++) {
System.out.println(days.get(i));
System.out.print("\t" + "\t");
System.out.println(temp.get(i));
}
double sum = 0.0;
for ( int i = 0; i < temp.size(); i++) {
sum += temp.get(i);
}
double average = (double) sum / temp.size();
System.out.println("\n" + "Average temperature = " + average);
//Ask user if he'd like to see the information again.
System.out.print("Enter 'week' here to see temperature details again: ");
userChoice = scnr.next();
}
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