How can I solve this error in my code?

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I have input file include these elements:

1,3,1
2,1,4
3,4,2
4,0,6
5,2,3

and I want to read this input file to get an output in my code so I did this main code:

public static void main(String[] args) throws IOException {
		File File = new File("C:/Users/Princ/Downloads/testdata1 for SRTF.txt");
		Scanner s = new Scanner(File);
		int n = 5;
		int a;
		int b;
		int c;
		String data;

		SJF ob = new SJF();
		Process1 proc[] = new Process1[n];
		while (s.hasNextLine()) {

			for (int i = 0; n > i; i++) {

				a = Integer.parseInt(s.nextLine());
				b = Integer.parseInt(s.nextLine());

				c = Integer.parseInt(s.nextLine());

				proc[i] = new Process1(a, b, c);

			}

			ob.findavgTime(proc, n);
		}
	}

and then I get this error:-

Exception in thread "main" java.lang.NumberFormatException: For input string: "1,3,1"
	at java.base/java.lang.NumberFormatException.forInputString(NumberFormatException.java:68)
	at java.base/java.lang.Integer.parseInt(Integer.java:652)
	at java.base/java.lang.Integer.parseInt(Integer.java:770)
	at SJF.main(SJF.java:125)

What I have tried:

What should I fix in my code and what's wrong?

Posted 4-May-22 13:46pm

Prince X Faisal

Updated 4-May-22 16:15pm

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Graeme_Grant · Answer 1 · 2022-05-04T15:54:00

This line:

Java

a = Integer.parseInt(s.nextLine());

is reading the 3 numbers + comma as a string. So s.nextLine() is reading "1,3,1" as a whole string. This is what the compiler error message is telling you:

at java.base/java.lang.NumberFormatException.forInputString(NumberFormatException.java:68)

You need to store as string, then split the string into 3 integer values. You can read more about it here: Split() String method in Java with examples - GeeksforGeeks[^]

M Imran Ansari · Answer 2 · 2022-05-04T16:15:00

In addition of solution-1, change your for logic logic with split method:

Java

for (int i = 0; n > i; i++) {
	String fileLine = s.nextLine();
	// split method will return an array of values on the basis of ','
	String[] parts = fileLine.split(",");
	int part1 = parts[0]; // 1
	int part2 = parts[1]; // 3
	int part3 = parts[2]; // 1

	a = Integer.parseInt(part1);
	b = Integer.parseInt(part2);
	c = Integer.parseInt(part3);

	proc[i] = new Process1(a, b, c);
}

How can I solve this error in my code?

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Solution 2

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