Question

I need help debugging this Java program. I am getting this error message:

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 2

at population.Population.main(Population.java:85)

I am not able to run this program.

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import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Scanner;

/* Linked list node*/
class node
{
long data;
long year;
String country;
node next;

node(String c,long y,long d)
{
country=c;
year=y;
data = d;
next = null;
}
}

public class Population
{
private static node head;
public static void push(String country,long year,long data)
{

node new_node = new node(country,year,data);

new_node.next = head;

head = new_node;
}
//function to search for country in list and find its data
public static void find(String c)
{
node temp=head;
long startYear=0;
long endYear=0;
//finding the data for 2015 and 2100 for the given country
while(temp!=null)
{
if(temp.country.equalsIgnoreCase(c) && temp.year==2015)
{
System.out.println("Population of the "+c+" for the year 2015: "+ temp.data);
startYear=temp.data;
}
else if(temp.country.equalsIgnoreCase(c) && temp.year==2100)
{
endYear=temp.data;
}
temp=temp.next;

}
if(startYear!=0 && endYear!=0)
System.out.println("Difference in population from 2015 to 2100: "+(endYear-startYear));
else
System.out.println("Not found!");
}

public static void main(String[] args) throws IOException
{

File infile=new File("globalpopulation.csv");
Scanner scanner;
scanner = null;
try
{
scanner = new Scanner(infile);
} catch (FileNotFoundException e)
{

e.printStackTrace();
}

while(scanner.hasNextLine())
{
String a[]=scanner.nextLine().split(",");
push(a[0],Long.parseLong(a[1]),Long.parseLong(a[2]));

}
scanner.close();
Scanner in=new Scanner(System.in);
System.out.print("Enter the country:");
String country=in.nextLine();

find(country);
in.close();

}

}

Answer 1

while(scanner.hasNextLine())
{
String a[]=scanner.nextLine().split(",");
push(a[0],Long.parseLong(a[1]),Long.parseLong(a[2]));

}

this code is reading the data from the csv fils

exception is coming here because it expecting 3 values per each row in the file

country,year,population but in some of the lines these data is not coming properly that is the reason it giving Exception

Please check the data