eclipse - File not found exception - Java -
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i writing code parallel arrays , when read in data , try display error comes up. ga teaches lab not see problem code , said should try here. here code , error right after it. using eclipse.
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 = 0; < 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 = 1; < 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 = 1; < count; i++) { if ((pop10[i]/area[i]) > (pop10[hdindex]/area[hdindex])) hdindex = i; } return hdindex; } } exception:
exception in thread "main" java.io.filenotfoundexception: citypopulationdata.txt (the system cannot find file specified) @ java.io.fileinputstream.open(native method) @ java.io.fileinputstream.<init>(unknown source) @ java.util.scanner.<init>(unknown source) @ parallelarrays.main(parallelarrays.java:7)
well exception self explanatory "java.io.filenotfoundexception"
==>file citypopulation = new file("citypopulationdata.txt");
since using eclipse, try giving absolute path of file c:/data/filex.txt etc. work. after create resource folder in project tree , put file there. use classloader.getresouceasstream load file. following method used when want relative access file..you can more info online regaarding method.
hope helps
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