我正在编写一个java程序来获取每个月的降雨量。它工作得很好，但我只需要知道如何获得一个月的指数 - 例如，有一个输出声明：降雨量最少的月份是1英寸，1.6英寸。我怎样得到'1'，这是最低月份的指数？我可以得到实际最低的降雨量数字，但不是指数。
我已经尝试了几个月[n-1]，但是我仍然收到错误“非静态变量月份无法从静态上下文中引用”。
任何帮助都会很棒。谢谢。
//编辑
这是代码。我试着玩静态，但这只是给了我更多的错误？因此，底部的月份[n]部分是我被困住的地方。
import java.util.*;
public class Rainfall {
Scanner in=new Scanner(System.in);
int month=12;
double total=0;
double average;
double months[];
public Rainfall()
{
months=new double[12];
}
public void setMonths()
{
for(int n=1; n<=month; n++ )
{
System.out.print("Enter the rainfall (in inches) for month #"+n+": ");
months[n-1] = in.nextDouble();
//Input Validation - Cannot accept a negative number
while (months[n-1] < 0)
{
System.out.print("Rainfall must be at least 0. Please enter a new value.");
months[n-1] = in.nextDouble();
}
}
}
public double getTotalRainFall()
{
total = 0;
for(int i=0; i<12;i++)
{
total=total+months[i];
}
return total;
}
public double getAverageRainFall()
{
average = total/12;
return average;
}
public double getHighestMonth()
{
double highest=0;
for ( int i = 0; i < 12; i++)
{
if ( months[i] > highest)
{
highest = months[i] ;
}
}
return highest;
}
public double getLowestMonth()
{
double lowest = Double.MAX_VALUE;
for ( int n = 0; n < month; n++)
{
if (months[n] < lowest )
{
lowest = months[n];
}
}
return lowest;
}
public static void main(String[]args)
{
Rainfall r =new Rainfall();
r.setMonths();
System.out.println("The total rainfall for this year is " + r.getTotalRainFall());
System.out.println("The average rainfall for this year is " + r.getAverageRainFall());
System.out.println("The month with the highest amount of rain is " + months[n] + "with" + r.getHighestMonth() "inches");
System.out.println("The month with the lowest amount of rain is " + months[n] "with" + r.getLowestMonth() "inches");
}
}
///编辑＃2 - 好的，所以上面的代码在每个月获取用户输入时都有效。现在我正在尝试设置数组thisYear中的值（即删除用户输入）。计算不再有效。我做错了什么？
package Rainfall;
public class Rainfall {
int month = 12;
double total = 0;
double average;
double getRainAt[];
public Rainfall() {
getRainAt = new double[12];
}
double getTotalRain() {
for (int i = 0; i < 12; i++) {
total = total + getRainAt[i];
}
return total;
}
double getAverageRain() {
average = total / 12;
return average;
}
int getHighestMonth() {
int high = 0;
for (int i = 0; i < 12; i++) {
if (getRainAt[i] > getRainAt[high]) {
high = i;
}
}
return high;
}
int getLowestMonth() {
int low = 0;
for (int i = 0; i < 12; i++) {
if (getRainAt[i] < getRainAt[low]) {
low = i;
}
}
return low;
}
public static void main(String[] args) {
// Create an array of rainfall figures.
double thisYear[] = {1.6, 2.1, 1.7, 3.5, 2.6, 3.7,
3.9, 2.6, 2.9, 4.3, 2.4, 3.7 };
int high; // The high month
int low; // The low month
// Create a RainFall object initialized with the figures
// stored in the thisYear array.
Rainfall r = new Rainfall(thisYear);
// Display the statistics.
System.out.println("The total rainfall for this year is " +
r.getTotalRain());
System.out.println("The average rainfall for this year is " +
r.getAverageRain());
high = r.getHighestMonth();
System.out.println("The month with the highest amount of rain " +
"is " + (high+1) + " with " + r.getRainAt(high) +
" inches.");
low = r.getLowestMonth();
System.out.println("The month with the lowest amount of rain " +
"is " + (low+1) + " with " + r.getRainAt(low) +
" inches.");
}
}
答案 0 :(得分：1)
非静态变量月份
当您从静态成员或块访问非静态成员时，会出现此编译时错误 像 -
class Test { private int i = 0; public static void main（String [] args）{ I = 1; //这将填充该错误。 } } 我想我们可以从不同的方式看待这个问题
class RainFall{
private double minFall;
private double maxFall;
public void setMinFall(double minFall) {
this.minFall = minFall;
}
public double getMinFall() {
return minFall;
}
public void setMaxFall(double maxFall) {
this.maxFall = maxFall;
}
public double getMaxFall() {
return maxFall;
}
}
public class RainFallMeasure{
public static void main(String[] args) {
Map<Integer,RainFall> rainFalls=new HashMap<Integer,RainFall>();
RainFall janRainFall = new RainFall();
janRainFall.setMinFall(1);
janRainFall.setMaxFall(1.6);
rainFalls.put(Calendar.JANUARY, janRainFall);
RainFall febRainFall = new RainFall();
...
rainFalls.put(Calendar.FEBRUARY, febRainFall);
}
}
答案 1 :(得分：0)
您可以使用此方法找到索引
public class TEST {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
double temp[] = {1, 5, 3};
System.out.print(getIndex(temp,3));
}
//takes 2 parameters one is array and other is the value for which you want find index
public static int getIndex(double[] temp, int value)
{
int i ;
for( i= 0; i< temp.length; i++)
{
if(temp[i] == value)
{
return i;
}
}
return -1;
}
}
代替temp，你可以在传递参数时使用你的月份。
答案 2 :(得分：0)
另一种方法是重新设计您的应用程序，以便这些方法计算具有最高和最低降雨量的月份的索引，而不是自己计算rainfaill数量。我们的想法是，一旦掌握了索引，就可以随时查询实际值。
我已经为你修补了代码，以便它可以做到这一点，并冒昧地纠正了一些“静态”错误。
您可以使用此工作应用程序并根据需要进行调整：
import java.util.*;
public class Rainfall {
Scanner in = new Scanner(System.in);
int month = 12;
double total = 0;
double average;
double months[];
public Rainfall() {
months = new double[12];
}
public void enterMonthData() {
for (int n = 1; n <= month; n++) {
System.out.print("Enter the rainfall (in inches) for month #" + n + ": ");
months[n - 1] = in.nextDouble();
// Input Validation - Cannot accept a negative number
while (months[n - 1] < 0) {
System.out.print("Rainfall must be at least 0. Please enter a new value.");
months[n - 1] = in.nextDouble();
}
}
}
public double getTotalRainFall() {
total = 0;
for (int i = 0; i < 12; i++) {
total = total + months[i];
}
return total;
}
public double getAverageRainFall() {
average = total / 12;
return average;
}
/**
* Returns the index of the month with the highest rainfall.
*/
public int getHighestMonth() {
int highest = 0;
for (int i = 0; i < 12; i++) {
if (months[i] > months[highest]) {
highest = i;
}
}
return highest;
}
/**
* Returns the index of the month with the lowest rainfall.
*/
public int getLowestMonth() {
int lowest = 0;
for (int i = 0; i < 12; i++) {
if (months[i] < months[lowest]) {
lowest = i;
}
}
return lowest;
}
public static void main(String[]args) {
Rainfall r = new Rainfall();
r.enterMonthData();
System.out.println("The total rainfall for this year is " + r.getTotalRainFall());
System.out.println("The average rainfall for this year is " + r.getAverageRainFall());
int lowest = r.getLowestMonth();
int highest = r.getHighestMonth();
System.out.println("The month with the highest amount of rain is " + (highest+1) + " with " + r.months[highest] + " inches");
System.out.println("The month with the lowest amount of rain is " + (lowest+1) + " with " + r.months[lowest] + " inches");
}
}
<强>附录
要回答您的后续问题，您需要为Rainfall对象提供一个构造函数，该构造函数接收降雨数据并将此数据存储在对象的字段中。这就是你想要的：
public class Rainfall {
private double[] amounts;
public Rainfall(double[] amounts) {
this.amounts = amounts;
}
double getTotalRain() {
double total = 0.0;
for (int i = 0; i < amounts.length; i++) {
total += amounts[i];
}
return total;
}
double getAverageRain() {
return getTotalRain() / amounts.length;
}
int getHighestMonth() {
int high = 0;
for (int i = 0; i < amounts.length; i++) {
if (amounts[i] > amounts[high]) {
high = i;
}
}
return high;
}
int getLowestMonth() {
int low = 0;
for (int i = 0; i < 12; i++) {
if (amounts[i] < amounts[low]) {
low = i;
}
}
return low;
}
/**
* Returns the total rain the given month number. Month numbers
* start at 0, not 1.
*/
double getRainForMonth(int monthNumber) {
return amounts[monthNumber];
}
public static void main(String[] args) {
// Sample data for testing
double thisYear[] = { 1.6, 2.1, 1.7, 3.5, 2.6, 3.7, 3.9, 2.6, 2.9, 4.3, 2.4, 3.7 };
int high; // The high month, starting at 0
int low; // The low month, stating at 0
// Create a RainFall object initialized with amounts from above array.
Rainfall r = new Rainfall(thisYear);
// Display the statistics.
System.out.println("The total rainfall for this year is " + r.getTotalRain());
System.out.println("The average rainfall for this year is " + r.getAverageRain());
high = r.getHighestMonth();
System.out.println("The month with the highest amount of rain is " + (high + 1)
+ " with " + r.getRainForMonth(high) + " inches.");
low = r.getLowestMonth();
System.out.println("The month with the lowest amount of rain is " + (low + 1)
+ " with " + r.getRainForMonth(low) + " inches.");
}
}