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我寫並行陣列代碼,當我讀入數據,並嘗試以顯示它這個錯誤出現。教我實驗室的GA沒有看到我的代碼有問題,並說我應該在這裏嘗試。這裏是我的代碼,錯誤會在它後面。我正在使用eclipse。文件未發現異常 - Java的
import java.util.Scanner;
import java.io.File;
import java.io.FileNotFoundException;
public class parallelArrays {
public static void main(String[] args) throws FileNotFoundException {
File cityPopulation = new File("cityPopulationData.txt");
Scanner fileReader = new Scanner(cityPopulation);
fileReader.useDelimiter("[\t|\n]+");
String[] cities = new String[400];
int[] pop2010 = new int[400];
int[] pop2013 = new int[400];
double[] area = new double[400];
int count = getData(fileReader, cities, pop2010, pop2013, area);
displayArrays(cities, pop2010, pop2013, area, count);
largestCity(pop2010, count);
}
public static int getData(Scanner inf, String[] c, int[] pop10, int[] pop13, double[] a) {
int count = 0;
inf.next();
inf.next();
inf.next();
inf.next();
while(inf.hasNext()) {
c[count] = inf.next();
pop10[count] = inf.nextInt();
pop13[count] = inf.nextInt();
a[count] = inf.nextDouble();
count++;
}
return count;
}
public static void displayArrays(String[] c, int[] pop10, int[] pop13, double[] a, int count) {
for(int i = 0; i < count; i++){
System.out.printf("%s \t %d \t %d \t %f", c[i], pop10[i], pop13[i], a[i]);
}
}
public static int largestCity(int[] pop10, int count) {
int lCindex = 0;
for(int i = 1; i < count; i++) {
if(pop10[i] > pop10[lCindex])
lCindex = i;
}
return lCindex;
}
// public static int findGrowth(int[] pop10, int[] pop13, int count, ) {
//
// }
public static int highestDensity(int[] pop10, double[] area, int count) {
int hDindex = 0;
for(int i = 1; i < count; i++) {
if ((pop10[i]/area[i]) > (pop10[hDindex]/area[hDindex]))
hDindex = i;
}
return hDindex;
}
}
例外:
Exception in thread "main" java.io.FileNotFoundException: cityPopulationData.txt (The system cannot find the file specified)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(Unknown Source)
at java.util.Scanner.<init>(Unknown Source)
at parallelArrays.main(parallelArrays.java:7)
嘗試使用絕對路徑 – Nikolai97 2014-12-02 00:05:12
或保存項目的文件夾 – enrique7mc 2014-12-02 00:05:59
教師中的文件發送你左右。經典。 – csmckelvey 2014-12-02 00:08:27