Java Lab: Checker For Integer String

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Code in comments

[collegehelper]

import java.util.Scanner;

public class CheckerForIntegerString {
public static void main(String[] args) {
Scanner scnr = new Scanner(System.in);
String userString = scnr.nextLine();
int j = 0; // number of digits variable starting at 0

for (int i = 0; i < userString.length(); i++) {
Boolean flag =


if (flag)
j = j + 1;

}

if (j != userString.length())
System.out.println("no");

else // else print yes
System.out.println("yes");

scnr.close();
}
}