package practice;
import java.util.Scanner;
public class Shuvo {
public static void main(String[] args) {
System.out.print("please Enter your name: ");
char name;
Scanner user= new Scanner(System.in);
name = user.next().charAt('0');
System.out.println("HELLOW" +name); //<- why this isn't working??
user.close();
}
}
output:
please Enter your name: shuvo
Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: 48
at java.lang.String.charAt(Unknown Source)
at practice.Shuvo.main(Shuvo.java:11)
user.next().charAt('0');
will return the character that corresponds to the index with number '0'
.
'0'
is of char
type, which is actually numeric, and its decimal value is 48
. As you input doesn't have 48 characters, you get the ArrayIndexOfOfBoundsException
.
Use:
user.next().charAt(0);
which will return you the first character from the input.
或者干脆
char name=user.next().charAt(0);
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