我有两个数组：
我需要制作一个找到一个月的平均高温的方法，然后在main中，我需要编写一个循环来循环使用该方法，每个月平均并打印它们。
这是我对方法的尝试
public static double monthaverage(int[] a, int [] b, int c) {
int j=b[c];
int total = 0;
for (int i = 0; i <j; i++)
total += a[i];
double average = (double)total/ (double) j;
return average;
}
而且，我在主
中尝试循环和数据 int[] tmax = {32, 38, 34, 35, 41, 17, 25, 17, 29, 24, 26, 33, 31, 24,
29, 38, 20, 49, 49, 36, 31, 38, 35, 32, 37, 20, 17, 26,
30, 32, 22, 26, 12, 20, 35, 34, 19, 28, 22, 15, 30, 23,
20, 17, 16, 19, 21, 21, 32, 33, 19, 34, 35, 31, 19, 34,
21, 27, 27, 30, 36, 32, 46, 39, 23, 38, 40, 44, 47, 56,
41, 39, 38, 36, 45, 44, 28, 32, 34, 36, 35, 34, 39, 42,
49, 49, 41, 41, 40, 48, 45, 46, 66, 49, 48, 41, 47, 42,
35, 43, 54, 68, 66, 70, 65, 55, 67, 55, 57, 48, 63, 60,
53, 54, 55, 56, 58, 63, 57, 60, 55, 54, 62, 76, 75, 72,
84, 58, 59, 83, 68, 82, 64, 68, 70, 63, 74, 61, 65, 67,
69, 67, 65, 83, 84, 91, 79, 80, 77, 84, 73, 51, 50, 61,
60, 58, 73, 67, 65, 68, 81, 86, 80, 85, 78, 61, 61, 75,
72, 80, 69, 72, 72, 67, 82, 78, 67, 70, 59, 69, 75, 68,
78, 80, 71, 82, 82, 76, 84, 72, 84, 87, 90, 78, 76, 82,
76, 74, 70, 81, 84, 70, 82, 78, 76, 67, 67, 77, 83, 88,
86, 86, 86, 81, 81, 80, 82, 80, 76, 80, 77, 77, 67, 80,
77, 80, 85, 85, 89, 86, 83, 75, 73, 78, 70, 79, 75, 80,
79, 77, 75, 81, 86, 80, 84, 86, 72, 78, 82, 92, 89, 86,
78, 73, 74, 62, 73, 83, 85, 82, 83, 75, 72, 69, 65, 74,
74, 63, 63, 67, 74, 75, 69, 62, 55, 58, 58, 61, 69, 67,
63, 59, 56, 68, 70, 62, 68, 57, 61, 57, 46, 48, 66, 58,
65, 54, 47, 62, 54, 52, 59, 73, 58, 51, 58, 64, 64, 64,
68, 69, 65, 53, 58, 53, 47, 53, 60, 46, 53, 54, 47, 47,
53, 59, 46, 42, 42, 42, 41, 51, 61, 57, 41, 32, 38, 44,
45, 47, 51, 51, 57, 39, 45, 53, 48, 57, 47, 48, 56, 42,
50, 46, 40, 38, 47, 49, 47, 51, 62, 51, 43, 34, 23, 28,
44};
int [] monthlength= {31,28,31,30,31,30,31,31,30,31,30,31};
for (int i = 0; i <12; i++){
average= monthaverage(tmax, monthlength, c);
System.out.println("Average: test " + average);
c++;
}
答案 0 :(得分：0)
您可以使用以下代码来获取平均温度。请注意我已经使用main方法添加了SampleTemperature类。
public class SampleTemperature {
public static double monthaverage(int[] a, int[] b, int c) {
int j = b[c];
int total = 0;
int totalDays=0;
for (int numOfMonth=0;(numOfMonth<c);numOfMonth++) {
totalDays+=b[numOfMonth];
}
//System.out.println(c+"Start Date:"+totalDays+" Number of days"+j);
int startdate=totalDays;
for (int i = startdate; i < startdate+j; i++)
total += a[i];
double average = (double) total / (double) j;
return average;
}
public static void main(String[] args) {
int[] tmax = { 32, 38, 34, 35, 41, 17, 25, 17, 29, 24, 26, 33, 31, 24, 29, 38, 20, 49, 49, 36, 31, 38, 35, 32,
37, 20, 17, 26, 30, 32, 22, 26, 12, 20, 35, 34, 19, 28, 22, 15, 30, 23, 20, 17, 16, 19, 21, 21, 32, 33,
19, 34, 35, 31, 19, 34, 21, 27, 27, 30, 36, 32, 46, 39, 23, 38, 40, 44, 47, 56, 41, 39, 38, 36, 45, 44,
28, 32, 34, 36, 35, 34, 39, 42, 49, 49, 41, 41, 40, 48, 45, 46, 66, 49, 48, 41, 47, 42, 35, 43, 54, 68,
66, 70, 65, 55, 67, 55, 57, 48, 63, 60, 53, 54, 55, 56, 58, 63, 57, 60, 55, 54, 62, 76, 75, 72, 84, 58,
59, 83, 68, 82, 64, 68, 70, 63, 74, 61, 65, 67, 69, 67, 65, 83, 84, 91, 79, 80, 77, 84, 73, 51, 50, 61,
60, 58, 73, 67, 65, 68, 81, 86, 80, 85, 78, 61, 61, 75, 72, 80, 69, 72, 72, 67, 82, 78, 67, 70, 59, 69,
75, 68, 78, 80, 71, 82, 82, 76, 84, 72, 84, 87, 90, 78, 76, 82, 76, 74, 70, 81, 84, 70, 82, 78, 76, 67,
67, 77, 83, 88, 86, 86, 86, 81, 81, 80, 82, 80, 76, 80, 77, 77, 67, 80, 77, 80, 85, 85, 89, 86, 83, 75,
73, 78, 70, 79, 75, 80, 79, 77, 75, 81, 86, 80, 84, 86, 72, 78, 82, 92, 89, 86, 78, 73, 74, 62, 73, 83,
85, 82, 83, 75, 72, 69, 65, 74, 74, 63, 63, 67, 74, 75, 69, 62, 55, 58, 58, 61, 69, 67, 63, 59, 56, 68,
70, 62, 68, 57, 61, 57, 46, 48, 66, 58, 65, 54, 47, 62, 54, 52, 59, 73, 58, 51, 58, 64, 64, 64, 68, 69,
65, 53, 58, 53, 47, 53, 60, 46, 53, 54, 47, 47, 53, 59, 46, 42, 42, 42, 41, 51, 61, 57, 41, 32, 38, 44,
45, 47, 51, 51, 57, 39, 45, 53, 48, 57, 47, 48, 56, 42, 50, 46, 40, 38, 47, 49, 47, 51, 62, 51, 43, 34,
23, 28, 44 };
int[] monthlength = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
for (int i = 0; i < monthlength.length; i++) {
double average = monthaverage(tmax, monthlength, i);
System.out.println("Average: test " + average);
}
}
}
更新了
答案 1 :(得分：0)
这是我的版本，它基本上和@Coder一样，带有一些额外的打印输出/几个额外的命名变量，可以更轻松地跟随它们。
首先，您会注意到main（）方法基本相同。它在一年中的每个月循环（分别通过索引0-11）并打印出平均温度。循环中的另一个println调用只是一个可视化来分隔输出文本。
public static void main(String[] args) throws Exception {
for (int i = 0; i < 12; ++i) {
System.out.println(new String(new char[80]).replace("\0", "-"));
System.out.println("Average: test " + monthAverage(i));
}
}
其次，你会注意到monthAverage（）方法乍一看是相当大的，但事实上它可以减少很多 - 大部分膨胀都来自变量的正确命名，以更好地帮助说明每个各自用于。另请注意：camelCase是遵循java的好习惯。
public static double monthAverage(int monthIndex) {
if (monthIndex < 0 || monthIndex > 11)
throw new IndexOutOfBoundsException("month index out of range.");
double result = 0L;
int startOffset = 0;
for (int i = 0; i < monthIndex; ++i)
startOffset += monthLength[i];
int len = monthLength[monthIndex];
int endOffset = startOffset + len;
System.out.printf("Day #'s: start=%03d, end=%03d, elapsed=%d, local month=%s",
startOffset, endOffset, len, new DateFormatSymbols().getMonths()[monthIndex]);
System.out.println();
for (int i = startOffset; i < endOffset; ++i) {
double dayTemp = (double) tmax[i];
result += dayTemp;
}
return (result / len);
}
monthAverage（）从确保索引是正确的索引开始。然后计算开始/结束日期。最后取出并返回月份的平均值。
总之它看起来像这样：
import java.text.DateFormatSymbols;
public class App {
public static final int[] tmax = { 32, 38, 34, 35, 41, 17, 25, 17, 29, 24, 26, 33, 31, 24, 29, 38, 20, 49, 49, 36,
31, 38, 35, 32, 37, 20, 17, 26, 30, 32, 22, 26, 12, 20, 35, 34, 19, 28, 22, 15, 30, 23, 20, 17, 16, 19, 21,
21, 32, 33, 19, 34, 35, 31, 19, 34, 21, 27, 27, 30, 36, 32, 46, 39, 23, 38, 40, 44, 47, 56, 41, 39, 38, 36,
45, 44, 28, 32, 34, 36, 35, 34, 39, 42, 49, 49, 41, 41, 40, 48, 45, 46, 66, 49, 48, 41, 47, 42, 35, 43, 54,
68, 66, 70, 65, 55, 67, 55, 57, 48, 63, 60, 53, 54, 55, 56, 58, 63, 57, 60, 55, 54, 62, 76, 75, 72, 84, 58,
59, 83, 68, 82, 64, 68, 70, 63, 74, 61, 65, 67, 69, 67, 65, 83, 84, 91, 79, 80, 77, 84, 73, 51, 50, 61, 60,
58, 73, 67, 65, 68, 81, 86, 80, 85, 78, 61, 61, 75, 72, 80, 69, 72, 72, 67, 82, 78, 67, 70, 59, 69, 75, 68,
78, 80, 71, 82, 82, 76, 84, 72, 84, 87, 90, 78, 76, 82, 76, 74, 70, 81, 84, 70, 82, 78, 76, 67, 67, 77, 83,
88, 86, 86, 86, 81, 81, 80, 82, 80, 76, 80, 77, 77, 67, 80, 77, 80, 85, 85, 89, 86, 83, 75, 73, 78, 70, 79,
75, 80, 79, 77, 75, 81, 86, 80, 84, 86, 72, 78, 82, 92, 89, 86, 78, 73, 74, 62, 73, 83, 85, 82, 83, 75, 72,
69, 65, 74, 74, 63, 63, 67, 74, 75, 69, 62, 55, 58, 58, 61, 69, 67, 63, 59, 56, 68, 70, 62, 68, 57, 61, 57,
46, 48, 66, 58, 65, 54, 47, 62, 54, 52, 59, 73, 58, 51, 58, 64, 64, 64, 68, 69, 65, 53, 58, 53, 47, 53, 60,
46, 53, 54, 47, 47, 53, 59, 46, 42, 42, 42, 41, 51, 61, 57, 41, 32, 38, 44, 45, 47, 51, 51, 57, 39, 45, 53,
48, 57, 47, 48, 56, 42, 50, 46, 40, 38, 47, 49, 47, 51, 62, 51, 43, 34, 23, 28, 44 };
public static final int[] monthLength = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
public static void main(String[] args) throws Exception {
for (int i = 0; i < 12; ++i) {
System.out.println(new String(new char[80]).replace("\0", "-"));
System.out.println("Average: test " + monthAverage(i));
}
}
/**
* monthAverage method
*
* @param monthIndex
* The given month average to compute (e.g. 0 = jan. 11 = dec.)
* @return the average temp
*/
public static double monthAverage(int monthIndex) {
if (monthIndex < 0 || monthIndex > 11)
throw new IndexOutOfBoundsException("month index out of range.");
double result = 0L;
int startOffset = 0;
for (int i = 0; i < monthIndex; ++i)
startOffset += monthLength[i];
int len = monthLength[monthIndex];
int endOffset = startOffset + len;
System.out.printf("Day #'s: start=%03d, end=%03d, elapsed=%d, local month=%s",
startOffset, endOffset, len, new DateFormatSymbols().getMonths()[monthIndex]);
System.out.println();
for (int i = startOffset; i < endOffset; ++i) {
double dayTemp = (double) tmax[i];
result += dayTemp;
}
return (result / len);
}
}
这是我的输出：
--------------------------------------------------------------------------------
Day #'s: start=000, end=031, elapsed=31, local month=January
30.548387096774192
--------------------------------------------------------------------------------
Day #'s: start=031, end=059, elapsed=28, local month=February
24.642857142857142
--------------------------------------------------------------------------------
Day #'s: start=059, end=090, elapsed=31, local month=March
39.41935483870968
--------------------------------------------------------------------------------
Day #'s: start=090, end=120, elapsed=30, local month=April
54.86666666666667
--------------------------------------------------------------------------------
Day #'s: start=120, end=151, elapsed=31, local month=May
71.35483870967742
--------------------------------------------------------------------------------
Day #'s: start=151, end=181, elapsed=30, local month=June
69.73333333333333
--------------------------------------------------------------------------------
Day #'s: start=181, end=212, elapsed=31, local month=July
78.54838709677419
--------------------------------------------------------------------------------
Day #'s: start=212, end=243, elapsed=31, local month=August
79.35483870967742
--------------------------------------------------------------------------------
Day #'s: start=243, end=273, elapsed=30, local month=September
76.06666666666666
--------------------------------------------------------------------------------
Day #'s: start=273, end=304, elapsed=31, local month=October
59.483870967741936
--------------------------------------------------------------------------------
Day #'s: start=304, end=334, elapsed=30, local month=November
53.0
--------------------------------------------------------------------------------
Day #'s: start=334, end=365, elapsed=31, local month=December
45.83870967741935
希望有所帮助，让我知道是否有任何我遗漏/需要解释/不正确，欢呼。