特定用户输入的数组列表和条件语句

Question

我是 Java 的新手，我目前正在做一项作业，我在其中创建一个数组列表来存储用户输入的星期几和每日温度。我在创建一个条件语句时遇到困难，该条件语句将打印输入的天数+温度表，以及用户输入单词“周”时的平均温度。我已经能够打印所有这些信息，但这是我正在努力处理的条件语句。

我已经尝试使用 if-else 和 do-while 循环来创建条件，但是我继续遇到错误，或者例如使用下面的代码，如果输入“week”，则不会发生任何事情。我一直在使用“days.equals”，但我相信这是我可能出错的地方。

   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"));

  }  

  }

我希望程序在用户输入单词“周”时输出以下内容。

-----------------------

Day         Temperature

-----------------------

Monday      90.0

Tuesday     94.0

Wednesday   89.0

Thursday    84.0

Friday      82.0

Saturday    85.0

Sunday      88.0

Average temperature = 87.42857142857143

Answer 1

如果我正确理解您的问题，那么您需要做的是在获得几天的温度后等待用户输入，检查该值是否为“周”，然后才打印您的值。以下内容应该有效。ArrayList<String> days = new ArrayList<String>();&nbsp;ArrayList<Double> temp = new ArrayList<Double>();&nbsp;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&nbsp;&nbsp; Sunday below.\n" );for (int i = 0;i < 7; i++) { // Loop 7 times for each day of the week&nbsp; &nbsp;System.out.print("Enter day of week: ");&nbsp; &nbsp;days.add(scnr.next());&nbsp; &nbsp;System.out.print("Enter temperature: ");&nbsp; &nbsp;temp.add(scnr.nextDouble());}// You ask for user input hereSystem.out.print("Enter 'week' here to see temperature details: ");String userChoice = scnr.next();while ("week".equalsIgnoreCase(userChoice)) {&nbsp; System.out.println("-----------------------------");&nbsp; System.out.println("Day\t" + "\tTemperature");&nbsp; System.out.println("-----------------------------");&nbsp; for(int i = 0; i < 7; i++) {&nbsp; &nbsp; &nbsp;System.out.println(days.get(i));&nbsp; &nbsp; &nbsp;System.out.print("\t" + "\t");&nbsp; &nbsp; &nbsp;System.out.println(temp.get(i));&nbsp; }&nbsp; double sum = 0.0;&nbsp; for ( int i = 0; i < temp.size(); i++) {&nbsp; &nbsp; &nbsp; sum += temp.get(i);&nbsp; }&nbsp; double average = (double) sum / temp.size();&nbsp; System.out.println("\n" + "Average temperature = " + average);&nbsp; //Ask user if he'd like to see the information again.&nbsp; System.out.print("Enter 'week' here to see temperature details again: ");&nbsp; userChoice = scnr.next();}&nbsp;&nbsp;