我有一种方法,它是用来计算具有最高组合值的3D数组的元素组。我有3个嵌套循环用于通过我的数组,并且在满足某些条件时我想更改这些变量。然而,没有一个变量正在被使用。如果sum
超过total
,我反对将int y
和int m
更改为for循环的任何迭代。为什么我的循环中没有改变我的变量?
谢谢。这里是我的代码:
public void wettestMonth(){
double sum = 0;
double total = 0;
int y = 0;
int m = 0;
//cycle through each year and month
for(int i = 0; i < 34; i++){
for(int j = 0; j < 12; j++){
//reset the current month to 0 after each month has been cycled through
sum = 0;
for(int k = 0; k < 31; k++){
//only add the record if the current entry is not null (-99.99)
if(sortedData[i][j][k] != -99.99){
sum += sortedData[i][j][k];
}
//if the current month is wetter than the wettest one, make the current month the new wettest one
if(sum > total){
total = sum;
y = i;
m = j;
}
}
}
}
JOptionPane.showMessageDialog(null, "The wettest month on record was " +m +y, "Wettest Month.", JOptionPane.PLAIN_MESSAGE);
}
编辑,我只是while循环,而不是和我得到什么似乎是问题的行超出范围的误差重建它,if(sortedData[i][j][k] != -99.99)
编辑2 ,这里是我声明并初始化sortedData[][][]
公共类的GetData {
//initialises an array that holds 34 years, each with 12 months, each of which has 31 entries for reach day
public double[][][] sortedData = new double[34][12][31];
//initialises a new scanner named rainFile
private Scanner rainFile;
//method for opening the file
public void openFile() {
try{
//as the input for the scanner we use the rainfall file
rainFile = new Scanner(new File("C:\\\\Users\\\\admin\\\\Documents\\\\NetBeansProjects\\\\110_term3\\\\WeatherDataFiles\\\\rainfall.txt"));
}
catch(Exception e){
//if no file has been found a JOptionPane will display an error message telling the user to double-check the file path
JOptionPane.showMessageDialog(null, "Check the file path is correct.", "No file found!", JOptionPane.ERROR_MESSAGE);
}
}
//method for reading the file
public void readFile(){
//ignore the first 3 lines in the data file
String dump1 = rainFile.nextLine();
String dump2 = rainFile.nextLine();
String dump3 = rainFile.nextLine();
//these nested for loops will dictate the current index of sortedData
for(int i = 0; i < 34; i++){
for(int j = 0; j < 12; j++){
//ignores the year and month at the start of each line
String dump4 = rainFile.next();
String dump5 = rainFile.next();
//this final nested for loop dictates the final index of sortedData
for(int k = 0; k < 31; k++){
//asigns the current value of scanner rainFile to String a
String a = rainFile.next();
//converts the String a to a double type and then assigns it to the current index of sortedData
double dbl = Double.parseDouble(a);
sortedData[i][j][k] = dbl;
}
}
}
}
这是启动应用程序在调试模式和/或写一些单元测试的时间... – home
建议:通过您的代码步在调试器下。看看“sortedData [i] [j] [k]”是否等于“-99.99”。看看“总数”和/或“总数”是否增加,以及在哪里。 – paulsm4
如果'sortedData'是一个'double [] [] []',并且缺省数据的值被显式设置为'-99.99',则比较将按预期工作[或者JVM被完全破坏]。如果'sortedData'是一个'float [] [] []',那么,'sortedData!= -99.99'可以替换为'true'。我正在外出,猜测'sortedData'是一个'float [] [] []'。 (你可以使用'-100'作为标记,或者检查'!= -99.99f'。) –