Question

我对Java还是很陌生，目前正在从事一项工作，其中我创建了一个数组列表来存储星期几和用户的每日温度输入。我在创建条件语句时遇到困难，如果用户输入单词“ week”，该条件语句将打印输入的天数+温度表以及平均温度。我已经能够打印所有这些信息，但这是我在努力的条件声明。

我尝试使用if-else和do-while循环创建条件，但是我继续遇到错误，或者使用下面的代码，如果输入了“ week”，则将什么也不会发生。我一直在使用“ days.equals”，但我认为这可能是我犯错的地方。

   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“ week”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“ week”，然后仅打印您的值。遵循以下内容应该可以。

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();
}

特定用户输入的数组列表和条件语句

1 个答案: