java.lang.StringIndexOutOfBounds错误

Question

import java.util.Scanner;

public class s
{
    public static void main(String[] args)
    {
        Scanner input=new Scanner (System.in);
        String string=input.next();
        System.out.println(string.charAt(7));
    }
}

I get this error when i run the program and i don't understand why. All i want to do is print the 7th character.

PS E:\Users\adiad\Documents\Scuola\Informatica\Madeo\Pratica> java s
hello world
Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: 7
        at java.base/java.lang.StringLatin1.charAt(Unknown Source)
        at java.base/java.lang.String.charAt(Unknown Source)
        at s.main(s.java:9)

Answer 1

You are using next() , which only reads the hello the first time you call it. You would get the world if you called next() again.

Use nextLine() if you want to read hello world in one go.

You can refer to the documentation to read more about the different methods available on the Scanner class.