Java - 返回数组中的多个字符串

Question

我目前正在为学校的作业处理一个问题集，我真的快要完成了，但是在运行我的程序时遇到了逻辑错误。

问题集包括显示平均周数。温度、最高温度、最低温度以及一周中最热和最冷的日子（如果也有多个显示的话）。

我目前遇到的问题是，如果有多个日子是最热或最冷的，很可能是由于我的方法，我的程序不会显示星期几。 （工作日）。

例如我想要的： 示例 1：

输入一周内每天的最高温度（从周日开始）：

11 21 15 12 21 15 9

一周平均气温：14.86度

本周最高气温：21度

本周最冷的温度是：9度

一周中最热的日子是：周一、周四 最冷的日子是：星期六

但是我遇到的问题是，当我尝试运行我的代码时会发生这种情况（从示例 1 复制相同的温度）：

示例 2：

输入一周内每天的最高温度（从周日开始）：

11 21 15 12 21 15 9

一周平均气温：14.86度

本周最高气温：21度

本周最冷的温度是：9度

一周中最热的日子是：MondayMonday // 这是我当前的问题。

我认为问题出在我的名为“weekDay”的方法中，很可能是它没有调用一周中的两个不同的日子，而是只调用一个，并且它会根据温度的多少显示 x 次与最大值或最小值相同。如果能得到这方面的指导就太好了，谢谢。

http://ideone.com/DAUcdR

public class test2
{
// Main method
public static void main(String[] args)
{
    // Create a new scanner
    Scanner input = new Scanner(System.in);

    // Set array list
    int[] tempList = new int[7];

    // Prompt user for input and store input
    System.out.println("Enter the hightest temperature of each day for a week (starting on Sunday): ");
        for(int i = 0; i < tempList.length; i++)
            tempList[i] = input.nextInt();

    // Averages temperature 
    double avgTemp = avgTemp(tempList);
        System.out.printf("The average temperature of the week is: %.2f degree %n", avgTemp);

    // Display hottest temperature
    int maxTemp = maxTemp(tempList);
        System.out.println("The highest temperature of the week is: " + maxTemp + " degree");

    // Display coldest temperature
    int minTemp = minTemp(tempList);
        System.out.println("The coldest temperature of the week is: " + minTemp + " degree");


    // Display hottest days of the week
    int[] maxTempList = searchTemp(tempList, maxTemp);
    System.out.print("The hottest days of the week are: ");
    for(int i = 0; i < maxTempList.length; i++)
        System.out.print(weekDay(maxTemp,tempList));

    // Display the coldest days of the week
    int[] minTempList = searchTemp(tempList, minTemp);
    System.out.println("\n The coldest days of the week are: ");
    for(int i = 0; i < minTempList.length; i++)
        System.out.print(weekDay(minTemp,tempList));
}

// Average the temperature
public static double avgTemp(int[] array)
{
    // Set a total temperature variable
    int tempTotal = array[0];

    // Add all temperature values
    for(int i = 1; i < array.length; i++)
        tempTotal = array[i]+tempTotal;

    // Return temperature average.
    return ((double)tempTotal/array.length);
}

// Get hottest temperature
public static int maxTemp(int[] array)
{
    // Set hottest day variable
    int max = array[0];

    // Check and replace max temperature
    for(int i = 1; i < array.length; i++){
        if(max < array[i])
            max = array[i];

    }
    return max;
}

// Get coldest temperature
public static int minTemp(int[] array)
{
    // Set coldest day variable
    int min = array[0];

    // Check and replace coldtest temperature
    for(int i = 1; i < array.length; i++){
        if(min > array[i])
            min = array[i];
    }
    return min;
}

public static String weekDay(int i, int[] array)
{
    int[] displayWeekDay = searchTemp(array, i);
    String[] weekDay = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};
    for(int j = 0; j < displayWeekDay.length; j++){
        int days = displayWeekDay[j];
        return weekDay[days];
    }
    return null;
}
// Finds the index of the hottest/coldest days
public static int[] searchTemp(int[] temp, int key)
{

    int count = 0;
    // Searches the array for the index where the element value is the same
    for(int i = 0; i < temp.length; i++){
        // When the number is the same as the key, increase count
        if(temp[i] == key)
            count++;
    }

    // Create index array based on same number to the key
    int[] index = new int[count];
    // Copy index numbers of the key into index array
    for(int j = 0; j < index.length; j++){
        for(int i = 0; i < temp.length; i++){
            if(temp[i] == key){
                if(j > 0 && index[j - 1] == i)
                    continue;
                else{
                    index[j] = i;
                    break;
                }
            }
        }
    }
    return index;
}

}

Answer 1

修改您的 weekDay 方法，如下所示，它将返回一个具有最高温度的工作日数组，然后您可以使用它来打印那些日子：

public class DisplayWeekTempStat {
// Main method
public static void main(String[] args) {
    // Create a new scanner
    Scanner input = new Scanner(System.in);

    // Set array list
    int[] tempList = new int[7];

    // Prompt user for input and store input
    System.out.println("Enter the hightest temperature of each day for a week (starting on Sunday): ");
    for (int i = 0; i < tempList.length; i++)
        tempList[i] = input.nextInt();

    // Averages temperature
    double avgTemp = avgTemp(tempList);
    System.out.printf("The average temperature of the week is: %.2f degree %n", avgTemp);

    // Display hottest temperature
    int maxTemp = maxTemp(tempList);
    System.out.println("The highest temperature of the week is: " + maxTemp + " degree");

    // Display coldest temperature
    int minTemp = minTemp(tempList);
    System.out.println("The coldest temperature of the week is: " + minTemp + " degree");

    // Display hottest days of the week

    System.out.print("The hottest days of the week are: ");
    String[] tempMaxWeekDay = weekDay(maxTemp, tempList);
    for (int num = 0; num < tempMaxWeekDay.length; num++) {
        if (tempMaxWeekDay[num] != null)
            System.out.println(tempMaxWeekDay[num]);
    }

    // Display the coldest days of the week
    System.out.println("\n The coldest days of the week are: ");
    String[] tempMinWeekDay = weekDay(minTemp, tempList);
    for (int num = 0; num < tempMinWeekDay.length; num++) {
        if (tempMinWeekDay[num] != null)
            System.out.println(tempMinWeekDay[num]);
    }
}

// Average the temperature
public static double avgTemp(int[] array) {
    // Set a total temperature variable
    int tempTotal = array[0];

    // Add all temperature values
    for (int i = 1; i < array.length; i++)
        tempTotal = array[i] + tempTotal;

    // Return temperature average.
    return ((double) tempTotal / array.length);
}

// Get hottest temperature
public static int maxTemp(int[] array) {
    // Set hottest day variable
    int max = array[0];

    // Check and replace max temperature
    for (int i = 1; i < array.length; i++) {
        if (max < array[i])
            max = array[i];

    }
    return max;
}

// Get coldest temperature
public static int minTemp(int[] array) {
    // Set coldest day variable
    int min = array[0];

    // Check and replace coldtest temperature
    for (int i = 1; i < array.length; i++) {
        if (min > array[i])
            min = array[i];
    }
    return min;
}

public static String[] weekDay(int i, int[] array) {
    String[] maxWeekDays = new String[7];
    String[] weekDay = { "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday" };
    int k = 0;
    for (int j = 0; j < weekDay.length; j++) {
        if (array[j] == i) {
            maxWeekDays[k] = weekDay[j];
            k++;
        }
    }
    return maxWeekDays;
}

}

Answer 2

您的 weekDay() 方法与 searchTemp() 方法基本相同。如果您查看 weekDay()，您将在内部看到您正在调用 searchTemp()。从 weekDay() 方法中删除 searchTemp()，可能是这样的：

public static String weekDay(int i)
{   int currentDay = 0;
    if((i / 7) == 0){
        currentDay = i;
    }
    else{
        currentDay = i % 7;
    }
    String[] weekDay = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};
    return weekDay[currentDay];
}

这假设您不关心现在是几月，并且该月总是从星期日开始