Contents of file patch.txt:
1
2
3
4
5
int sum = 0;
Scanner s = new Scanner (new File("patch.txt"));
while (s.hasNextLine()){
String [] str = s.nextLine().split("/r");
for (int i=0; i<str.length; i++){
sum+=Integer.parseInt(str[i]);
}
System.out.print(sum); //the result is 15
}
s.close();
}
}
When I sum the data must be 15, but why do I always get an error?
Solution using for loop and array:
String[] str = new String[10];
for(int i = 0; s.hasNextLine(); i++) {
str[i] = s.nextLine();
sum += Integer.parseInt(str[i]);
}
System.out.print(sum);
But for this problem given below is a better solution:
while (s.hasNextLine()) {
String str = s.nextLine();
sum += Integer.parseInt(str);
}
System.out.print(sum);
for(;s.hasNextLine();) instead of while(s.hasNextLine()). But while loop is betterYou don't have to do String [] str = s.nextLine().split("/r"), it is not needed. You were also printing the sum from within the while loop, but it should be outside the while loop. Try this:
while (s.hasNextLine()){
String str = s.nextLine();
sum+=Integer.parseInt(str);
}
System.out.print(sum); //the result is 15
s.close();
for ( ; s.hasNextLine(); ) { instead.Try This :
Use a try catchfor Scanner otherwise it shows the error unreported exception java.io.FileNotFoundException;
import java.io.*;
import java.util.*;
class Entry1
{
static Scanner s ;
public static void main( String[] args )
{
int sum = 0;
try
{
s = new Scanner (new File("patch.txt"));
}
catch(Exception e)
{
System.out.print(e);
}
while (s.hasNextLine())
{
String [] str = s.nextLine().split("/r");
for (int i=0; i<str.length; i++){
sum+=Integer.parseInt(str[i]);
}
}
System.out.print(sum);
s.close();
}
}
int sum = 0;
Scanner s = new Scanner (new File("patch.txt"));
while (s.hasNextLine()){
String [] str = s.nextLine().split("\r");
for (int i = 0; i < str.length; i++){
if(!str[i].trim().isEmpty){
sum+=Integer.parseInt(str[i]);
}
}
}
s.close();
System.out.print(sum); //the result is 15
Try this.
Edited above code.
