Currently I have a code that looks like this
import java.util.*;
public class Main
{
static Scanner input = new Scanner(System.in);
public static void main(String[] args) {
String[] status={"f","f","f","f"};
System.out.println("Enter index to change: ");
int userInput = input.nextInt();
status[verify(status,userInput)] = "changed";
System.out.println(Arrays.toString(status));
}
private static int verify(String statusList[],int userIndex){
while(userIndex > (statusList.length-1) || userIndex < 0){
System.out.println("Invalid Index,enter correct Index ");
userIndex = input.nextInt();
}
return userIndex;
}
}
The “verify” method is used to check whether the user enters an index which is out of Bounds. I am wanting to extend the “verify” method to check if the user enters a string but am not sure how to do that. I want a message to be displayed saying that the user has entered a string and want to keep getting the user input until a correct array index is entered. Is there any way to check whether a string is entered, in the same method?
Answer
Take a look at the following code. Hope it works for you.
Java
import java.util.Arrays;
import java.util.Scanner;
public class Scan {
static Scanner input = new Scanner(System.in);
public static void main(String[] args) {
String[] status={"f","f","f","f"};
System.out.println("Enter index to change: ");
int userInput = verify(status, input);
status[userInput] = "changed";
System.out.println(Arrays.toString(status));
}
private static int verify(String statusList[], Scanner input){
do {
int userIndex=-1;
String line = input.next();
try {
userIndex = Integer.parseInt(line);
}catch(NumberFormatException e) {
System.out.println("Please enter a number.");
continue;
}
if(userIndex > (statusList.length-1) || userIndex < 0){
System.out.println("Invalid Index,enter correct Index ");
continue;
}else {
return userIndex;
}
}while(true);
}
}